PSR53-9G

## PSA/PSR Series 

## Positive Switching Regulator 

The PSA/PSR Series of positive switching regulators are designed as power supplies for electronic systems when no input-to-output isolation is required. Their major advantages include a high level of efficiency, high reliability, low output ripple, and excellent dynamic response. Models with input voltages up to 144 V are especially designed for secondary-switched and battery-driven mobile applications. The regulators are suitable for railway applications according to EN 50155 and EN 50121. 

The case design allows for operation up to 71 °C. The PSA/PSR Series are designed for wall or chassis mounting with faston connections or with solder pins for insertion into a PCB. 

Various options are available to adapt the regulators to different applications. 

## **FEATURES** 

- RoHS lead-free-solder and lead-solder-exempted products are available 

- 5 year warranty for RoHS compliant products with an extended temperature range 

- Input voltage up to 144 VDC 

- Single output of 5 to 48 VDC 

- No input-to-output isolation 

- High efficiency up to 95% 

- Extremely wide input voltage range 

- Low input-to-output differential voltage 

- Very good dynamic properties 

- Input undervoltage lockout 

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25<br>1.0"<br>50<br>70<br>2.0"<br>2.8"<br>**----- End of picture text -----**<br>


- Output voltage adjustment and inhibit function 

- Continuously no-load and short-circuit proof 

- All boards are coated with a protective lacquer 

- Boards or chassis mountable 

- Safety-approved to the latest edition of IEC/EN 62368-1 and CSA 60950-1 

## **Table of Contents** 

Description........................................................................................1 Model Selection ................................................................................2 Functional Description ......................................................................3 Electrical Input Data .........................................................................4 Electrical Output Data.......................................................................6 Auxiliary Functions .........................................................................10 

Electromagnetic Compatibility (EMC) .............................................11 Immunity to Environmental Conditions ...........................................12 Mechanical Data .............................................................................13 Safety and Installation Instructions .................................................14 Description of Options ....................................................................15 Accessories ....................................................................................16 

**belfuse.com/power-solutions** 

BCD20025-G Rev AG, 13 April 2022 

## PSA/PSR Series Positive Switching Regulator 

## **MODEL SELECTION** 

_Table 1: Model Selection_ 

|**Output**<br>**voltage**<br>**_V_o nom[V]**|**Output**<br>**current**<br>**_I_o nom[A]**|**Operating input**<br>**voltage range**<br>**_V_i [V]**|**Nom. input voltage**<br>**_V_o nom[V]**|**Efciency 2**<br>**η min [%]**<br>**ηmax [%]**|**Efciency 2**<br>**η min [%]**<br>**ηmax [%]**|**Type**<br>**designation**|**Options**|
|---|---|---|---|---|---|---|---|
|5<br>5<br>5<br>5|2<br>3<br>4<br>5|8 - 80<br>8 - 80<br>7 - 40<br>7 - 35|40<br>40<br>20<br>20|71.5<br>77<br>82<br>81|74<br>79<br>83<br>83|~~PSR52-7~~<br>PSR53-9G<br>PSR54-9iG<br>PSA55-9iG|Y<br>~~-7,  i, P, R,~~Y,~~non-G~~<br>~~-7, P, R,~~Y,~~non-G~~<br>~~-7, R,~~Y,~~non-G~~|
|5.1<br>5.1|2<br>5|8 - 80<br>7 - 35|20<br>20|75<br>83|-<br>-|~~PSA5A2-2~~<br>~~PSA5A5-2~~|iRY3<br>-7, iRY3|
|12<br>12<br>12|1.5<br>2.5<br>3|18 - 1441<br>15 - 80<br>15 - 40|60<br>40<br>20|86<br>86<br>89|87<br>87<br>-|PSA121.5-9iRG<br>PSR122.5-9iG<br>~~PSA123-2~~|~~-7,~~Y,~~non-G~~<br>~~-7, P, R,~~Y,~~non-G~~<br>iRY3|
|15<br>15<br>15|1.5<br>2.5<br>3|22 - 1441<br>19 - 80<br>19 - 40|60<br>40<br>30|86<br>88<br>90|87<br>89<br>-|PSA151.5-9iRG<br>PSR152.5-9G<br>~~PSA153-2~~|~~-7,~~Y,~~non-G~~<br>~~-7, P, R,~~Y,~~non-G~~<br>iRY3|
|24<br>24<br>24|1.5<br>2<br>2.5|31 - 1441<br>29 - 80<br>29 - 60|60<br>50<br>40|92<br>91<br>93|93<br>92<br>-|PSA241.5-9iRG<br>PSR242-9iG<br>~~PSA242.5-2G~~|~~-7,~~Y,~~non-G~~<br>~~-7, P, R,~~Y,~~non-G~~<br>iRY3,~~non-G~~|
|36<br>36|1.2<br>2|44 - 1441<br>42 - 80|80<br>60|93<br>92|95<br>94|PSA361-9iRG<br>PSR362-9iRG|~~-7,~~Y,~~non-G~~<br>~~-7,~~Y,~~non-G~~|
|48|1|58 - 1441|80|93|95|PSA481-9iRG|~~-7,~~Y,~~non-G~~|



> 1  Surges up to 156 V for 2 s; see _Electrical Input Data_ 

> 2 Efficiency at _V_ i nom and _I_ o nom 

> 3 Options iRY in a package 

NFND: Not for new designs.[Preferred for new designs.] 

**Note** : The output voltage _V_ o is adjusted to 108% of _V_ o nom for all models with option P or R, if they don’t have option Y in addition. 

## **Part Number Description** 

PSA 12 1.5 -9 i R G 

Positive switching regulator in case A01 .........PSA or PSR Nominal output voltage in Volt ................................. 5 to 48 Nominal output current in Ampere ............................. 1 to 5 Operational ambient temperature range _T_ A –10 to 50 °C ........................................................ ~~-2~~ –25 to 50 °C (customer-specific models) .............. -5 –25 to 71 °C (option) ........................................... ~~-7~~ –40 to 71 °C  ....................................................... ~~-9~~ other (customer-specific models)  ........................-0 Inhibit input (standard for all -7 and -9 models) ................. ~~[ i]~~ Control input for output voltage adjustment[ 1] ................... ~~[ R]~~ Potentiometer[ 1] (option, NFND) ....................................... ~~P~~ RoHS-compliant for all 6 substances .............................. ~~[ G]~~ 

1 Option P excludes feature R. 

**Note:** The sequence of options must follow the order above. 

**Example** : PSA121.5-9iRG designates a positive switching regulator with an output 12 V, 1.5 A, ambient temperature –40 to 71 °C, inhibit input, output voltge adjust by R-pin, RoHS-compliant for all 6 substances. 

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Page 2 of 17 

## PSA/PSR Series Positive Switching Regulator 

## **Customer-Specific Models** 

PSA 12 Z 3 A -9iRG 

Positive switching regulator in case A01 ..................... PSA Nominal output voltage in Volt (without decimals) .......... 12 Decimal places: 0.0 V ...................................................................... Z 0.1 V ...................................................................... A 0.15 V .................................................................... B 0.2 V ......................................................................C 0.25 V ....................................................................D 0.3 V ...................................................................... E 0.4 V ...................................................................... F 0.5 V ......................................................................G 0.6 V ......................................................................H 0.7 V .......................................................................J 0.8 V ...................................................................... K 0.9 V .......................................................................L other ...................................................................... Y Output current in Amperes ................................................3 Identification character  ...........................................A, B, ... Temperature range and options ............................... -9i RG 

## **Product Marking** 

Type designation, applicable safety approval marks, warnings, pin allocation, patent nos., and company logo. 

Input voltage range, nominal output voltage and current, pin allocation of auxiliary functions and options, and protection degree. Identification of LED and the optional potentiometer. 

Label with input voltage range, nominal output voltage and current, protection degree, batch no., serial no., and data code including production site, version (modification status), date of production. 

## **FUNCTIONAL DESCRIPTION** 

The switching regulators use the buck converter topology. The input is not electrically isolated from the output. During the on period of the switching transistor, current is transferred to the output, and energy is stored in the output choke. During the off period, this energy forces the current to continue flowing through the output, to the load, and back through the freewheeling diode. Regulation is ac complished by varying the duty cycle (on/off ratio) of the main switch. The regulator starts operating only when the input voltage exceeds the trigger level of the UVL (undervoltage lockout). 

These regulators are ideal for a wide range of applications, where input to output isolation is not necessary or is already provided by an external front end (e.g., a transformer with rectifier). To optimize customers’ needs, additional options and accessories are available. 

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03016b<br>I i Bead I o<br>Vi+ Vo+<br>i<br>+ +<br>V i C e Control circuit V o<br>C i<br>R<br>Gi– Go–<br>Option P<br>Input Filter<br>**----- End of picture text -----**<br>


_Fig. 1 Block diagram. The resistance of the input circuit_ 

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Positive Switching Regulator 

## PSA/PSR Series 

## **ELECTRICAL INPUT DATA** 

General Conditions: _T_ A = 25 °C, unless _T_ C is specified 

## _Table 2a: Input data (-2 models)_ 

|General Conditions:_T_A= 25 °C, unless_T_Cis speci<br>_Table 2a: Input data (-2 models)_|General Conditions:_T_A= 25 °C, unless_T_Cis speci<br>_Table 2a: Input data (-2 models)_|General Conditions:_T_A= 25 °C, unless_T_Cis speci<br>_Table 2a: Input data (-2 models)_|fed|||||
|---|---|---|---|---|---|---|---|
|**Model**|||**PSA55**|**PSA5A5**|**PSR54**|**PSA5A2**|**Unit**|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_i|Operating input voltage|_I_o= 0 – _I_o nom,<br>_T_C min–_T_C max|7<br>35|7<br>35|7<br>40|7<br>40|V|
|∆_V_io mi|n<br>Min. dif. voltage_V_i–_V_o||2|1.9|2|2.9||
|_V_i UVL|Undervoltage lockout||6.3<br>6.6|6.3<br>6.4|6.3<br>6.5|7.3<br>7.6||
|_I_i 0|No-load input current|_I_o= 0,_V_i min–_V_i max|45|50|45|50|mA|
|_I_inrp|Inrush peak current|_V_i nom|75|75|75|75|A|
|_R_i|Input resistance||10|10|10|10|mΩ|
|_C_i|Input capacitance||6.8|6.8|6.8|6.8|µF|
|_V_i RFI|EN 55011, 0.15 - 30 MHz|_V_i nom,_I_o nom|A1|---|A1|---|Class|



## _Table 2b: Input data_ 

|_Table 2b: Input data_|_Table 2b: Input data_|_Table 2b: Input data_|||||
|---|---|---|---|---|---|---|
|**Model**|||**PSA123**|**PSA153**|**PSA242.5**|**Unit**|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_i|Operating input voltage|_I_o= 0 – _I_o nom,<br>_T_C min–_T_C max|15<br>40|19<br>40|29<br>60|V|
|∆_V_io mi|n<br>Min. dif. voltage_V_i–_V_o||3|4|5||
|_V_i UVL|Undervoltage lockout||7.3<br>8.0|7.3<br>9.0|12<br>13.7||
|_I_i 0|No-load input current|_I_o= 0,_V_i min–_V_i max|50|50|50|mA|
|_I_inrp|Inrush peak current|_V_i nom|75|150|150|A|
|_R_i|Input resistance||10|10|10|mΩ|
|_C_i|Input capacitance||6.8|6.8|6.8|µF|
|_V_i RFI|EN 55011, 0.15 - 30 MHz|_V_i nom,_I_o nom|---|---|---|Class|



## _Table 2c: Input data_ 

|_Table 2c: Input data_|_Table 2c: Input data_|_Table 2c: Input data_|||||
|---|---|---|---|---|---|---|
|**Model**|||**PSR52**|**PSR53**|**PSR122.5**|**Unit**|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_i|Operating input voltage|_I_o= 0 – _I_o nom,<br>_T_C min–_T_C max|8<br>80|8<br>80|15<br>80|V|
|∆_V_io mi|n<br>Min. dif. voltage_V_i–_V_o||3|3|3||
|_V_i UVL|Undervoltage lockout||7.3<br>7.6|7.3<br>7.6|7.3<br>8||
|_I_i 0|No-load input current|_I_o= 0,_V_i min–_V_i max|40|40|35|mA|
|_I_inrp|Inrush peak current|_V_i nom|150|150|150|A|
|_R_i|Input resistance||10|10|10|mΩ|
|_C_i|Input capacitance||6.8|6.8|6.8|µF|
|_V_i RFI|EN 55011, 0.15 - 30 MHz|_V_i nom,_I_o nom|A2|A2|A2|Class|



> 1 With _C_ e = 470 µF / 40 V and input filter FP38; see _Accessories._ 

> 2 With _C_ e = 470 µF / 100 V and input filter FP80; see _Accessories._ 

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Page 4 of 17 

## PSA/PSR Series Positive Switching Regulator 

_Table 2d: Input data. General Conditions as per Table 2a_ 

|**Model**|**Model**|**Model**|**PSR152.5**|**PSR242**|**PSR362**|**PSA121.5**|**Unit**|
|---|---|---|---|---|---|---|---|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_i|Operating input voltage|_I_o= 0 – _I_o nom,<br>_T_C min–_T_C max|19<br>80|29<br>80|42<br>80|18<br>1441|V|
|∆_V_io mi|n<br>Min. dif. voltage_V_i–_V_o||3|4|5|6||
|_V_i UVL|Undervoltage lockout||7.3<br>9.0|12<br>13.7|19<br>20.5|12<br>12.5||
|_I_i 0|No-load input current|_I_o= 0,_V_i min–_V_i max|35|35|40|20|mA|
|_I_inrp|Inrush peak current|_V_i nom|150|150|150|150|A|
|_R_i|Input resistance||10|10|10|10|mΩ|
|_C_i|Input capacitance||6.8|6.8|6.8|2.2|µF|
|_V_i RFI|EN 55011, 0.15 - 30 MHz|_V_i nom,_I_o nom|A2|A2|A2|A3|Class|



_Table 2e: Input data. General Conditions as per table 2a_ 

|**Model**|**Model**|**Model**|**PSA151.5**|**PSA241.5**|**PSA361**|**PSA481**|**Unit**|
|---|---|---|---|---|---|---|---|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_i|Operating input voltage|_I_o= 0 – _I_o nom,<br>_T_C min–_T_C max|22<br>1441|31<br>1441|44<br>1441|58<br>1441|V|
|∆_V_io mi|n<br>Min. dif. voltage_V_i–_V_o||7|7|8|10||
|_V_i UVL|Undervoltage lockout||18<br>18.5|22<br>23|31<br>32|44<br>45||
|_I_i 0|No-load input current|_I_o= 0,_V_i min–_V_i max|20|20|25|25|mA|
|_I_inrp|Inrush peak current|_V_i nom|150|150|150|150|A|
|_R_i|Input resistance||10|10|10|10|mΩ|
|_C_i|Input capacitance||2.2|2.2|2.2|2.2|µF|
|_V_i RFI|EN 55011, 0.15 - 30 MHz|_V_i nom,_I_o nom|A3|A3|A3|A3|Class|



- 1 Surges up to 156 V for 2 s 

> 2 With _C_ e = 470 µF/ 100 V and input filter FP80; see _Accessories_ 

> 3 With _C_ e = 2 × 3.3 µF / 250 V MKT and input filter FP144; see _Accessories_ 

## **External Input Circuitry** 

The sum of the lengths of the supply lines to the source or to the nearest capacitor ≥100 µF (a + b) should not exceed 5 m. External input filter is recommended in order to prevent power line oscillations and reduce superimposed interference voltages. 

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04016a<br>Vi+ Vo+<br>+<br>a<br>b<br>Gi– Go–<br>**----- End of picture text -----**<br>


_Fig. 2 Switching regulator with long supply lines._ 

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PSA/PSR Series Positive Switching Regulator 

## **ELECTRICAL OUT PUT DATA** 

General conditions: – _T_ A = 25 °C, unless _T_ C is specified – R-input open (or _V_ o set to _V_ o nom with option P) 

## _Table 3a: Output data_ 

|<br>– R-input open (or_V_oset to_V_o nomwith option P)<br>_Table 3a: Output data_|<br>– R-input open (or_V_oset to_V_o nomwith option P)<br>_Table 3a: Output data_|<br>– R-input open (or_V_oset to_V_o nomwith option P)<br>_Table 3a: Output data_|<br>– R-input open (or_V_oset to_V_o nomwith option P)<br>_Table 3a: Output data_||||||
|---|---|---|---|---|---|---|---|---|
|**Output**||||**PSA55**|**PSA5A5**|**PSR54**|**PSA5A2**|**Unit**|
|**Characteristics**|||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_o|Output voltage1||_V_i nom,_I_o nom|4.97<br>5.03|5.05<br>5.15|4.97<br>5.03|5.05<br>5.15|V|
|_I_o|Output current||_V_i min–_V_i max<br>_T_C min–_T_C max|0<br>5.0|0<br>5.0|0<br>4.0|0<br>2.0|A|
|_I_oL|Output current limitation|||5.0<br>6.5|5.0<br>6.5|4.0<br>5.2|2.0<br>2.6||
|_V_o|Output<br>voltage<br>noise|Switching<br>frequency|_V_i nom,_I_o nom<br>IEC/EN 61204<br>BW = 20 MHz|20<br>50|70|15<br>40|40|mVpp|
|||Total||24<br>70|100|19<br>60|60||
|∆_V_o V|Static line regulation||_V_i min–_V_i max,_I_o nom|30<br>40|40|30<br>40|40|mV|
|∆_V_o l|Static load|regulation|_V_i nom,_I_o_=_0 –_I_o nom|20<br>25|25|10<br>45|20||
|_V_o d|Dynamic<br>load<br>regulation|Voltage<br>deviation|_V_i nom<br>_I_o nom↔ 1/3<br> _I_o nom<br>IEC/EN 61204|250|300|200|300||
|_t_d||Recovery time||40|100|40|100|µs|
|αVo|Temperature coefcient<br>∆_V_o/∆_T_C(_T_C min–_T_C max)||_V_i min–_V_i max<br>_I_o_=_0 –_I_o nom|±0.02|±0.02|±0.02|±0.02|%/K|



## _Table 3b: Output data_ 

|_Table 3b: Output data_|_Table 3b: Output data_|_Table 3b: Output data_|_Table 3b: Output data_|||||
|---|---|---|---|---|---|---|---|
|**Output**||||**PSA123**|**PSA153**|**PSA242.5**|**Unit**|
|**Characteristics**|||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_o|Output voltage1||_V_i nom,_I_o nom|11.9<br>12.1|14.9<br>15.1|23.8<br>24.2|V|
|_I_o|Output current||_V_i min–_V_i max<br>_T_C min–_T_C max|0<br>3.0|0<br>3.0|0<br>2.5|A|
|_I_oL|Output current limitation|||3.0<br>3.9|3.0<br>3.9|2.5<br>3.25||
|_V_o|Output<br>voltage<br>noise|Switching<br>frequency|_V_i nom,_I_o nom<br>IEC/EN 61204<br>BW = 20 MHz|90|110|150|mVpp|
|||Total||110|150|170||
|∆_V_o V|Static line regulation||_V_i min–_V_i max,_I_o nom|70|85|180|mV|
|∆_V_o l|Static load|regulation|_V_i nom,_I_o_=_0 –_I_o nom|40|60|140||
|_V_o d|Dynamic<br>load<br>regulation|Voltage<br>deviation|_V_i nom<br>_I_o nom↔ 1/3<br> _I_o nom<br>IEC/EN 61204|360|450|720||
|_t_d||Recovery time||120|120|160|µs|
|αVo|Temperature coefcient<br>∆_V_o/∆_T_C(_T_C min–_T_C max)||_V_i min–_V_i max<br>_I_o_=_0 –_I_o nom|±0.02|±0.02|±0.02|%/K|



> 1 Models with option R, but without option Y, are adjusted to 108% of _V_ o nom. Models with option P are preadjusted to 108% of _V_ o nom. 

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## PSA/PSR Series Positive Switching Regulator 

_Table 3c: Output data. General conditions as per table 3a_ 

|**Output**|**Output**|**Output**|**Output**|**PSR52**|**PSR53**|**PSR122.5**|**Unit**|
|---|---|---|---|---|---|---|---|
|**Characteristics**|||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_V_o|Output voltage1||_V_i nom,_I_o nom|4.97<br>5.03|4.97<br>5.03|11.9<br>12.1|V|
|_I_o|Output current||_V_i min–_V_i max<br>_T_C min–_T_C max|0<br>2.0|0<br>3.0|0<br>2.5|A|
|_I_oL|Output current limitation|||2.0<br>2.6|3.0<br>3.9|2.5<br>3.25||
|_V_o|Output<br>voltage<br>noise|Switching<br>frequency|_V_i nom,_I_o nom<br>IEC/EN 61204<br>BW = 20 MHz|20<br>40|20<br>60|30<br>70|mVpp|
|||Total||24<br>60|24<br>80|35<br>90||
|∆_V_o V|Static line regulation||_V_i min–_V_i max,_I_o nom|30<br>40|30<br>45|30<br>45|mV|
|∆_V_o l|Static load|regulation|_V_i nom,_I_o_=_0 –_I_o nom|20<br>25|20<br>25|40||
|_V_o d|Dynamic<br>load<br>regulation|Voltage<br>deviation|_V_i nom<br>_I_o nom↔ 1/3<br> _I_o nom<br>IEC/EN 61204|100|100|180||
|_t_d||Recovery time||50|50|60|µs|
|αVo|Temperature coefcient<br>∆_V_o/∆_T_C(_T_C min–_T_C max)||_V_i min–_V_i max<br>_I_o_=_0 –_I_o nom|±0.02|±0.02|±0.02|%/K|



_Table 3d: Output data. General conditions as per table 3a_ 

|_Table 3d: Output data. General conditions as per_|_Table 3d: Output data. General conditions as per_|_Table 3d: Output data. General conditions as per_|_Table 3d: Output data. General conditions as per_|_table 3a_||||||
|---|---|---|---|---|---|---|---|---|---|
|**Output**||||**PSR152.5**|**PSR242**|**PSR362**|**PSA121.5**||**Unit**|
|**Characteristics**|||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|||
|_V_o|Output voltage1||_V_i nom,_I_o nom|14.91<br>15.09|23.86<br>24.14|35.78<br>36.22|11.93<br>12.07||V|
|_I_o|Output current||_V_i min–_V_i max<br>_T_C min–_T_C max|0<br>2.5|0<br>2.0|0<br>2.0|0<br>1.5||A|
|_I_oL|Output current limitation|||2.5<br>3.25|2.0<br>2.6|2.0<br>2.6|1.5<br>1.9|||
|_V_o|Output<br>voltage<br>noise|Switching<br>frequency|_V_i nom,_I_o nom<br>IEC/EN 61204<br>BW = 20 MHz|40<br>110|30<br>150|80<br>200|20<br>40||mVpp|
|||Total||50<br>150|40<br>170|85<br>220|24<br>50|||
|∆_V_o V|Static line regulation||_V_i min–_V_i max,_I_o nom|70<br>85|60<br>220|200<br>250|20|80|mV|
|∆_V_o l|Static load|regulation|_V_i nom,_I_o_=_0 –_I_o nom|40<br>50|90<br>160|125<br>160|20|30||
|_V_o d|Dynamic<br>load<br>regulation|Voltage<br>deviation|_V_i nom<br>_I_o nom↔ 1/3<br> _I_o nom<br>IEC/EN 61204|180|210|250|50|||
|_t_d||Recovery time||60|80|100|50||µs|
|αVo|Temperature coefcient<br>∆_V_o/∆_T_C(_T_C min–_T_C max)||_V_i min–_V_i max<br>_I_o_=_0 –_I_o nom|±0.02|±0.02|±0.02|±0.02||%/K|



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Page 7 of 17 

## PSA/PSR Series 

## Positive Switching Regulator 

_Table 3e: Output data. General conditions as per table 3a_ 

|_Table 3e: Output data. General conditions as per_|_Table 3e: Output data. General conditions as per_|_Table 3e: Output data. General conditions as per_|_Table 3e: Output data. General conditions as per_|_table 3a_||||||
|---|---|---|---|---|---|---|---|---|---|
|**Output**||||**PSA151.5**|**PSA241.5**|**PSA361**|**PSA481**||**Unit**|
|**Characteristics**|||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|||
|_V_o|Output voltage1||_V_i nom,_I_o nom|14.91<br>15.09|23.86<br>24.14|35.78<br>36.22|47.71<br>48.29||V|
|_I_o|Output current||_V_i min–_V_i max<br>_T_C min–_T_C max|0<br>1.5|0<br>1.5|0<br>1.2|0<br>1.0||A|
|_I_oL|Output current limitation|||1.5<br>1.9|1.5<br>1.9|1.2<br>1.5|1.0<br>1.3|||
|_V_o|Output<br>voltage<br>noise|Switching<br>frequency|_V_i nom,_I_o nom<br>IEC/EN 61204<br>BW = 20 MHz|25<br>50|45<br>75|45<br>80|50<br>75||mVpp|
|||Total||29<br>60|50<br>120|50<br>120|55<br>120|||
|∆_V_o V|Static line regulation||_V_i min–_V_i max,_I_o nom|40<br>40|40<br>80|80<br>120|90|120|mV|
|∆_V_o l|Static load|regulation|_V_i nom,_I_o_=_0 –_I_o nom|20<br>50|30<br>40|40<br>80|60|100||
|_V_o d|Dynamic<br>load<br>regulation|Voltage<br>deviation|_V_i nom<br>_I_o nom↔ 1/3<br> _I_o nom<br>IEC/EN 61204|50|50|200|300|||
|_t_d||Recovery time||50|60|40|100||µs|
|αVo|Temperature coefcient<br>∆_V_o/∆_T_C(_T_C min–_T_C max)||_V_i min–_V_i max<br>_I_o_=_0 –_I_o nom|±0.02|±0.02|±0.02|±0.02||%/K|



> 1 Models with option R, but without option Y, are adjusted to 108% of _V_ o nom. Models with option P are preadjusted to 108% of _V_ o nom. 

**==> picture [226 x 159] intentionally omitted <==**

**----- Start of picture text -----**<br>
V o<br>v od V o ±1% V o ±1%<br>v od<br>t d t d<br>t<br>I o/ I o nom<br>1<br>0.3<br>≥ 10 µs ≥ 10 µs<br>0 05010a t<br>**----- End of picture text -----**<br>


_Fig. 3 Switching regulator with long supply lines._ 

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Page 8 of 17 

## PSA/PSR Series 

## Positive Switching Regulator 

## **Thermal Considerations** 

When a switching regulator is located in free, quasi-stationary air (convection cooling) at a temperature _T_ A = 71 °C and is operated at _I_ o nom, the case temperature _T_ C will be about 95 °C after the warm-up phase, measured at the measuring point of case temperature _T_ C; see _Mechanical Data_ . 

Under practical operating conditions, _T_ A may exceed 71 °C, provided that additional measures (heat sink, fan etc.) are taken to ensure that _T_ C does not exceed _T_ C max. 

**==> picture [490 x 163] intentionally omitted <==**

**----- Start of picture text -----**<br>
I o/ I o nom I o/ I o nom<br>1.0 05032a 1.0 05031a<br>0.9 0.9 forced<br>0.8 Forced  0.8 cooling<br>0.7 Convection cooling cooling 0.7 convection cooling<br>0.6 0.6 T C max<br>0.5 T C max 0.5<br>0.4 0.4<br>0.3 0.3<br>0.2 0.2<br>0.1 0.1<br>0 T A min 40 50 60 70 80   [°C] T A  0 T A min 50 60 70 80 90 °C T A<br>**----- End of picture text -----**<br>


_Fig. 4a Output current versus temperature (models -2)_ 

_Fig. 4b Output current versus temperature (models -7 and -9)_ 

## **Output Protection and Short Circuit Behavior** 

A voltage suppressor diode, which in worst case conditions fails into a short circuit, protects the output against an internally generated overvoltage. Such an overvoltage could occur due to a failure of either the control circuit or the switching transistor. The output protection is not designed to withstand externally applied overvoltages. 

A constant current limitation circuit holds the output current almost constant, when an overload or a short circuit is applied to the output. It acts self-protecting and recovers auto matically after removal of the overload or short-circuit condition. 

## **Parallel and Series Connection** 

Outputs of equal nominal voltages can be parallel-connected. However, the use of a single regulator with higher output power, is always the better solution. 

In parallel-connected operation, one or several outputs may operate continuously at their current limit knee-point which will cause an increase of the heat generation. Consequently, the max. ambient temperature should be reduced by 10 K. 

Outputs can be series-connected with any other regulator. In series-connection the maximum output current is limited by the lowest current limitation, but electrically separated sourc e voltages are needed for each regulator. 

**==> picture [208 x 115] intentionally omitted <==**

**----- Start of picture text -----**<br>
V o/ V o nom<br>05033a<br>1.0<br>0.8<br>I o L<br>0.6<br>0.4<br>0.2<br>0<br>0.2 0.4 0.6 0.8 1.0 1.2 I o/ I o nom<br>**----- End of picture text -----**<br>


_Fig. 5_ 

_Overload and short-circuit behavior V_ o _versus I_ o 

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PSA/PSR Series Positive Switching Regulator 

## **AUXILIARY FUNCTIONS** 

## **i Inhibit (Remote On / Off)** 

The inhibit input allows the switching regulator output to be disabled via a control signal. In systems with several converters, this feature can be used, for example, to control the activation sequence of the converters by a logic signal (TTL, C-MOS, etc.). No output voltage overshoot will occur at switch-on. 

**Note:** With open i-pin, the output is enabled. 

**==> picture [490 x 123] intentionally omitted <==**

**----- Start of picture text -----**<br>
I inh [mA]<br>06010a<br>5 06009a<br>4 Vi+ Vo+<br>3 I inh<br>i<br>2<br>V o on V o off V inh<br>1<br>Gi– Go–<br>0<br>V inh [V]<br>-50 -40 -30 -20 -10 0 10 20 30 40 50<br> = 0.8 V  = 2.4 V<br>inh inh<br>V V<br>**----- End of picture text -----**<br>


_Fig. 6 Typical inhibit current I_ inh _versus inhibit voltage V_ inh 

_Fig. 7 Definition of I_ inh _and V_ inh 

_Table 4: Inhibit characteristics_ 

|**Characteristics**|**Characteristics**|**Characteristics**|**Conditions**|**min**<br>**typ**<br>**max**|**Unit**|
|---|---|---|---|---|---|
|_V_inh|Inhibit input<br>voltage|_V_o= on|_V_i min–_V_i max<br>_T_C min–_T_C max|- 10<br>+0.8|V|
|||_V_o= of||+2.4<br>+50||
|_t_r|Switch-on time||_V_i=_V_i nom<br>_R_L=_V_o nom/_I_o nom|2|ms|
|_t_f|Switch-of time|||4||
|_I_i inh|Input current when<br>inhibited||_V_i=_V_i nom|10|mA|



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**----- Start of picture text -----**<br>
V o/ V o nom<br>1 06001<br>0.1<br>0 t<br>t r t f<br>Inhibit<br>1<br>0 t<br>**----- End of picture text -----**<br>


_Fig. 8 Output response as a function of inhibit signal_ 

## **LED Output Voltage Indicator** 

A yellow LED indicator is illuminated, when the output voltage is present (not for -2 models). 

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© 2022 Bel Power Solutions & Protection 

PSA/PSR Series Positive Switching Regulator 

## **ELECTROMAGNETIC COMPATIBILITY (EMC)** 

## **Electromagnetic Immunity** 

_Table 8: Electromagnetic immunity type tests_ 

|**Phenomenon**<br>**S**|**tandard**<br>**Level**|**Coupling mode**|**Value**<br>**applied**|**Waveform**|**Source**<br>**imped.**|**Test procedure**|**In**<br>**oper.**|**Perf.**<br>**crit.** 2|
|---|---|---|---|---|---|---|---|---|
|Voltage surge3<br>IE|C 60571-1<br>3|i/c, +i/–i|800 Vp|100 µs|100 Ω|1 positive and<br>1 negative surge<br>per coupling<br>mode|yes|B|
||||1500 Vp|50 µs|||||
||||3000 Vp|5 µs|||||
||||4000 Vp|1 µs|||||
||||7000 Vp|100 ns|||||
|Electrostatic<br>discharge5<br>IE<br>6|C/EN<br>1000-4-2<br>33<br>24|contact discharge<br>to case|6000 Vp 3|1/50 ns|330 Ω|10 pos. & 10 neg.<br>discharges|yes|B5|
||||4000 Vp 4||||||
|Electromagnetic<br>feld<br>IE<br>6|C/EN<br>1000-4-3<br>x|antenna|20 V/m|AM 80% / 1 kHz|N/A|80 – 1000 MHz|yes|A|
||||20 V/m|||800 – 1000 MHz|||
||||10 V/m|||1400 – 2000 MHz|||
||||5 V/m|||2000 – 2500 MHz|||
||||3 V/m|||5100 – 6000 MHz|||
|Electrical fast<br>transients /<br>burst5<br>IE<br>6|C/EN<br>1000-4-4<br>33<br>24|i/c, +i/–i|2000 Vp|bursts of 5/50 ns;<br>5 kHz repet. rate;<br>transients with 15 ms<br>burst duration;<br>300 ms period|50 Ω|60 s positive<br>60 s negative<br>transients per<br>coupling mode|yes|A5|
||||1000 Vp||||||
|Surges5<br>IE<br>6|C/EN<br>1000-4-5<br>23<br>2|+i/–i|1000 Vp|1.2 / 50 µs|2 Ω|5 pos. & 5 neg.<br>surges per<br>coupling mode|yes|A5|
|||+i/–i|1000 Vp||42 Ω||||
|Conducted<br>disturbances<br>IE<br>6|C/EN<br>1000-4-6<br>33<br>24|i, o, signal wires|10 VAC3|AM 80% / 1 kHz|150 Ω|0.15 – 80 MHz|yes|A|
||||3 VAC4||||||



> 1 i = input, o = output, c = case. 

2 A = Normal operation, no deviation from specifications, B = Normal operation, temporary loss of function or deviation from specs possible 

3 Not applicable for -2 models 

4 Valid for -2 models 

5 With the filters and input caps as specified in the foot notes of table 2 

## **Electromagnetic Emission** 

For emission levels refer to _Electrical Input Data_ . 

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**----- Start of picture text -----**<br>
[dBmV]<br>90 07012<br>80<br>EN 55032 A<br>70<br>EN 55032 B<br>60<br>50<br>40<br>30<br>20<br>10<br>0 MHz<br>0.01 0.02 0.05 0.1 0.5 1  2 5 10 20 30<br>**----- End of picture text -----**<br>


_Fig. 9_ 

_Typical disturbance voltage (quasi-peak) at the input as per EN 55011, measured at V_ i nom _, I_ o nom. 

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## PSA/PSR Series Positive Switching Regulator 

## **IMMUNITY TO ENVIRONMENTAL CONDITIONS** 

_Table 6: Mechanical and climatic stress_ 

|**Test method**|**Test method**|**Standard**|**Test Conditions**|**Status**|
|---|---|---|---|---|
|Cab|Damp heat<br>steady state|IEC/EN 60068-2-78<br>MIL-STD-810D section 507.2|Temperature:<br>40±2°C<br>Relative humidity:<br>93+2/-3%<br>Duration:<br>56 days|Regulator not<br>operating|
|Ea|Shock<br>(half-sinusoidal)|IEC/EN 60068-2-27<br>MIL-STD-810D section 516.3|Acceleration amplitude:<br>50 gn= 490 m/s2<br>Bump duration:<br>11 ms<br>Number of bumps:<br>18 (3 in each direction)|Regulator<br>operating|
|Fc|Vibration<br>(sinusoidal)|IEC/EN 60068-2-6<br>MIL-STD-810D section 514.3|Acceleration amplitude:<br>0.35 mm (10 – 60 Hz)<br>5 gn= 49 m/s2(60 - 2000 Hz)<br>Frequency (1 Oct/min):<br>10 – 2000 Hz<br>Test duration:<br>7.5 h (2.5 h in each axis)|Regulator<br>operating|
|Fda|Random vibration<br>wide band<br>Reproducibility high|IEC/EN 60068-2-35<br>DIN 40046 part 23|Acceleration spectral density:<br>0.05 gn<br>2/Hz<br>Frequency band:<br>20 to 500 Hz<br>Acceleration magnitude:<br>4.9 gn rms<br>Test duration:<br>3 h (1 h in each axis)|Regulator<br>operating|
|Kb|Salt mist cyclic<br>(sodium chloride<br>NaCl solution)|IEC/EN 60068-2-52|Concentration:<br>5 % (30 °C)<br>Duration:<br>2 h per cycle|Regulator not<br>operating|
||||Storage:<br>40 °C, 93% rel. humidity<br>Storage duration:<br>22 h per cycle||
||||Number of cycles:<br>3||



## **Temperatures** 

_Table 7: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)_ 

|**Temperature**|**Temperature**|**Temperature**|**-2**|**-7 (Option)**|**-9 (Option)**|**Unit**|
|---|---|---|---|---|---|---|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_T_A|Ambient temperature 1|Regulator operating|- 10<br>50|- 25<br>71|- 40<br>71|° C|
|_T_C|Case temperature||- 10<br>80|- 25<br>95|- 40<br>95||
|_T_S|Storage temperature1|Not operational|- 25<br>100|- 40<br>100|- 55<br>85||



> 1 See _Thermal Considerations._ 

## **Reliability** 

_Table 8: Typical MTBF and device hours_ 

|**MTBF**<br>**Case temperature**|**Ground benign**<br>**_T_C= 40 °C**|**Ground fxed**<br>**_T_C= 40 °C**<br>**_T_C= 70 °C**|**Ground fxed**<br>**_T_C= 40 °C**<br>**_T_C= 70 °C**|**Ground mobile**<br>**_T_C= 50 °C**|**Device hours 1**|
|---|---|---|---|---|---|
|MTBF accord. to MIL-HDBK-217F|789 000 h|200 000 h|104 000 h|104 000 h|5 100 000 h|



1 Statistical values, based on an average of 4300 working hours per year and in general field use 

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## PSA/PSR Series Positive Switching Regulator 

## **MECHANICAL DATA** 

Dimensions in mm. 

**==> picture [384 x 320] intentionally omitted <==**

**----- Start of picture text -----**<br>
20.5<br>18.7 6.3 Potentiometer Yellow<br>(option P) LED (not -2 models)<br>1.2<br>09015b<br>12.2<br>Go– Vo+ i R<br>Ø 4<br>M2.5 Mounting<br> screws<br>Gi– Vi+<br>2.7 [±0.2]<br>50.2 [±0.2] Measuring point<br>of case temperature<br>min. 5<br>European<br>2.8 x 0.5 Projection<br>(1.0 x 0.5 option Y)<br>8.75<br> ±0.5<br> ±0.2<br>65 70.2 8.4<br>47.5<br> ±0.5  ±0.5<br>7 25.2<br> ±1<br>6.5<br>**----- End of picture text -----**<br>


_Fig. 10a Case A01, weight 100 g, Aluminum, black anodized and self cooling_ 

**==> picture [148 x 186] intentionally omitted <==**

**----- Start of picture text -----**<br>
20.5<br>6.3 18.7<br>1.2<br>09016b<br>R i Vo+ Go–<br>M2.5 mounting<br>screws<br>Vi+ Gi–<br>51.4<br>8.75<br>a<br> ±0.1<br>71.4 65<br>47.5<br>**----- End of picture text -----**<br>


_Fig. 10_ 

_Footprint. a = rectangular slots 3.0 mm x 0.7 mm (or_ ∅ _3.0 mm through-plated holes) For option Y preview through-plated holes with_ ∅ _1.3  to 1.5 mm for the pins and holes for two M 2.5 fastening screws._ 

## **Notes:** 

Pin i and pin R are only fitted if the regulator exhibits these options. To avoid short circuits with the board, you can use the isolation pad HZZ01203-G; see _Accessories._ 

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PSA/PSR Series 

Positive Switching Regulator 

## **SAFETY AND INSTALLATION INSTRUCTIONS** 

## **Installation Instruction** 

Installation must strictly follow the national safety regulations in compliance with the enclosure, mounting, creepage, clearance, casualty, markings and segregation re quirements of the end-use application. 

Check for hazardous voltages before connecting. 

The input and the output circuit are not separated, i.e. the negative path is internally interconnected. 

Do not open the regulator ! 

Ensure that a regulator failure (e.g. by an internal short-circuit) does not result in a hazardous condition. 

## **Cleaning Liquids** 

In order to avoid possible damage, any penetration of cleaning fluids must be prevented, since the power supplies are not hermetically sealed. 

## **Protection Degree** 

The protection degree is IP 30 (IP 20, if equipped with option P). It applies only if the regulator is soldered to the mother board. 

## **Standards and Approvals** 

All switching regulators have been approved according to the latest edition of IEC/EN  62368-1 and CSA  60950-1 

The regulators have been evaluated for: 

- Building in 

- The use in a pollution degree 2 environment 

- Connecting the input to a secondary circuit, which is subject to a maximum transient rating of 1500 V. 

The switching regulators are subject to manufacturing surveillance in accordance with the above mentioned standards and with ISO 9001:2015. 

## **Isolation** 

Electric strength test voltage between input connected with output against case: 1500 VDC, ≥1 s (for some PSA/PSR models only with version V103 or higher). 

These tests are performed in the factory as routine test in accordance with EN 62911 and IEC/EN  62368-1. 

## **Railway Application** 

The regulators have been developed observing the railway standards EN 50155 and EN 50121. All boards are coated with a protective lacquer. 

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PSA/PSR Series Positive Switching Regulator 

## **DESCRIPTION OF OPTIONS** 

## **-9 Extended Temperature Range** 

This option defines an extended temperature range as specified in table 7. 

## **R Control  (Output Voltage Adjust)** 

**Note:** With open R input, _V_ o ≈ _V_ o nom. 

**==> picture [210 x 114] intentionally omitted <==**

**----- Start of picture text -----**<br>
JM078<br>Vi+ Vo+<br>V ref = 2.5 V 4 k Ω R ext2<br>R<br>+ +<br>Control<br>logic R ext1 V ext<br>–<br>Gi– Go–<br>**----- End of picture text -----**<br>


_Fig. 11_ 

_Voltage adjustment via R-input_ 

The output voltage _V_ o can either be adjusted with an external voltage source ( _V_ ext) or with an external resistor ( _R_ 1 or _R_ 2). The adjustment range is 0 – 108% of _V_ o nom. The minimum differential voltage ∆ _V_ io min between input and output (see _Electrical Input Data_ ) should be maintained. 

**==> picture [212 x 36] intentionally omitted <==**

**Caution:** To prevent damage, _V_ ext should not exceed 20 V, nor be negative. 

b) _V_ o = 0 to _V_ o nom, using _R_ ext1 between pins R and Go–: 

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**==> picture [236 x 10] intentionally omitted <==**

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**Caution:** To prevent damage, _R_ ext2 should never be less than 47 kΩ. 

**Note** : With option R, the ouput voltage _V_ o is adjusted to 108% of _V_ o nom, if the regulator doesn’t have option Y in addition. 

## **P Potentiometer** 

Option P excludes R function; the R-input (pin 16) should be left open-circuit. The output voltage _V_ o can be adjusted in the range 90 – 108% of _V_ o nom. 

However, the minimum differential voltage ∆ _V_ i o min between input and output specified in _Electrical Input Data_ must be observed. 

**Note:** Option P is not recommended, if several regulators are operated in parallel connection. 

## **Y Solder Pins** 

Models with rectangular pins 1.0 × 0.5 mm (length 6.5 mm). Such regulators can be fitted to PCB boards (through-plated holes with ∅ 1.3 to 1.5 mm). 

## **G RoHS Compliance** 

Models with G are RoHS-compliant for all six substances. 

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PSA/PSR Series Positive Switching Regulator 

## **ACCESSORIES** 

A variety of electrical and mechanical accessories are available including: 

- Filters and ring core chockes for ripple and interference reduction; see table 9. 

- Tags and isolation pads for easy and safe PCB-mounting 

- Adapters for chassis and DIN-rail mounting 

## **Isolation Pads for PCB Mounting** 

In applications, where PCB mounting converters are placed on top of double sided boards, the use of an isolation pad is recommended. This fibre foil avoids short circuits and provide excellent protection against possible damage to tracks. 

**==> picture [253 x 276] intentionally omitted <==**

**----- Start of picture text -----**<br>
50<br>25<br>20.5 18.7<br>6.3<br>1.2<br>JM105<br>2.6<br>6.5<br>8.75 ±0.1<br>65 70<br>47.5<br>35<br>**----- End of picture text -----**<br>


_Fig. 12_ 

_Isolation pad HZZ01203-G (ISOLATIONA,A01); 0.3 mm thick_ 

## **Input Filters** 

Different input filters are available; see table 9. 

_Table 9: Input filters FP. T_ A _= 25°C unless otherwise specified_ 

|**Characteristics**|**Characteristics**|**Conditions**|**FP 38 2**|**FP 80**|**FP 144**|**Unit**|
|---|---|---|---|---|---|---|
||||**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_I_Fn|Rated current1|_L_ = 0.75_L_o|4|4|2|A|
|_V_Fn|Rated voltage|_T_C min–_T_C max|5<br>40|5<br>80|15<br>144|VDC|
|_R_F|Ohmic resistance||18<br>20<br>22|18<br>20<br>22|90<br>95<br>100|mΩ|
|_L_o|No load inductance|_I_L= 0,_T_C min–_T_C max|30<br>34<br>38|30<br>34<br>38|88<br>100<br>112|µH|
|_T_A|Ambient temperature|_I_F=_I_Fn|- 40<br>80|- 40<br>80|- 40<br>95|° C|
|_T_C|Case temperature||- 40<br>92|- 40<br>92|- 40<br>98||
|_T_S|Storage temperature|Not operational|- 40<br>100|- 40<br>100|- 55<br>100||



- 1 For currents _I_ F > 4 A the following derating takes place: _T_ A max = 100 – 1.3 • _I_ F 2  [°C], _T_ C max = 100 – 0.49 • _I_ F 2  [°C]. 

- 2 FP 38 is obsolete. 

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BCD20025-G Rev AG, 13 April 2022 Page 16 of 17 

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## PSA/PSR Series Positive Switching Regulator 

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**----- Start of picture text -----**<br>
25 [ ±0.5] 6.8 [ ±1] 16.6 [ ±1]<br>12016a<br>4 3<br>positioning<br>min. 4.5 pin I<br>S$ /| |<br>2 1<br>|<br>Fig. 13 positioning<br>Im<br>Different filters pin 4<br>JM079<br>2 Vi+1 Vo+ 1 3.22 [ ±0.5] 5.08 5.08 (3.22)<br>H FP filter I!!<br>V i Loe 3 -..!111 Gi–PSA/PSRGo– 7! V o RL<br>rt<br>Fig. 14 Fig. 15<br>Connection of the FP filter Mechanical data of the FP filter. Weight approx. 30 g<br>(3.66)<br>0.9 x 0.56<br>M 2.5 15.24<br> ±0.5<br>37.8 5.08<br> ±1<br>ø1.3  10.16<br>3.66<br>**----- End of picture text -----**<br>


## **Mounting Supports** 

Different mounting supports for DIN-rail and chassis mountig are described in the Mounting Supports data sheet on our web site. They also allow for fitting additional components. 

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Fig. 16<br>Adapter for chassis mounting<br>**----- End of picture text -----**<br>


**For additional accessory product information, see the accessory data sheets listed with each product series at our web site.** 

**NUCLEAR AND MEDICAL APPLICATIONS** - These products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. 

**TECHNICAL REVISIONS** - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. 

tech.support@psbel.com **belfuse.com/power-solutions** 

BCD20025-G Rev AG, 13 April 2022 

© 2022 Bel Power Solutions & Protection 

Page 17 of 17