24IBX15-50-0ZG

## IBX15 Series 

## Boost Converters 

The boost converters were designed in accordance with the standards EN 50155 and EN 50121-3-2 to meet the re quirements of various railway and industrial applications in rugged environ ment. They are particularly suitable to expand the input voltage range of power supplies (e.g. 110IMY15 or 110IMY70 Series DC-DC con verters). An additional circuit allows for providing a predefined interruption time. 

When the input voltage exceeds a predefined output voltage level, the input voltage is directly fed forward. The converters exhibit an input EMC-filter. 

**==> picture [90 x 39] intentionally omitted <==**

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11.5<br>54.9 0.45"<br>2.16" 54.9<br>2.16"<br>**----- End of picture text -----**<br>


The boost converters are available in a fully enclosed case or open-frame (option Z). 

## **Features** 

- RoHS-compliant for all 6 substances 

- 5 year warranty 

- Wide input voltage range 16.8 to 160 VDC 

- Output: 50 to 80 VDC 

- Class III equipment (no isolation input/output) 

- Extremely high efficiency 

- Excellent surge and transient protection 

- Externally adjustable output voltage 

- Programmable undervoltage lockout and inhibit 

- Interruption time with external capacitor 

- EN 50155, 50121-3-2 observed 

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

## **Table of Contents** 

Page 

Description............................................................................1 Model Selection ....................................................................2 Functional Description ..........................................................2 Electrical Input Data .............................................................3 Electrical Output Data...........................................................5 Auxiliary Functions ...............................................................6 

Page 

Electromagnetic Compatibility (EMC) ...................................7 Immunity to Environmental Conditions .................................9 Mechanical Data .................................................................10 Safety and Installation Instructions .....................................10 Options ...............................................................................11 

**belfuse.com/power-solutions** 

BCD.00197 Rev AG, 09-Mar-2021 

IBX15 Series Boost Converters 

## **Model Selection** 

_Table 1: Model Selection_ 

|_Table 1: Model Selection_|_Table 1: Model Selection_|||||||
|---|---|---|---|---|---|---|---|
|**Input voltage**<br>**_V_i nom**|**Operating input range**<br>**_V_i**|**Output Voltage**<br>**_V_o nom**|**Output Current**<br>**_I_o nom**|**Efficiency1**<br>**η min**<br>**η typ**||**Type designation**|**Options**|
|24 V|16.8 - 160 VDC|50 - 160 VDC|1.6 A|89 %|93 %|24IBX15-50-0G|Z|
|36 V|25.2 - 160 VDC|50 - 160 VDC|2.2 A|91 %|95 %|36IBX15-50-0G||



> 1 Efficiency at _V_ i = _V_ i min, _V_ o = _V_ o nom, _I_ o = _I_ o nom 

## **Functional Description** 

The IBX15 boost converter is designed as step-up converter in order to increase the input voltage _V_ i to the regulated boost voltage _V_ oBr. When _V_ i exceeds _V_ oB tr, the output voltage follows _V_ i. The resulting voltage (see fig. 1) is within the range of _V_ oB tr to _V_ i max, which is suitable for adequate DC-DC converters, e.g. 110IMY15 or 110IMY70 for 24/36IBX15-50. The IBX15 converters have no input-to-output isolation; isolation is provided by the DC-DC converters connected to the output. 

**==> picture [191 x 140] intentionally omitted <==**

**----- Start of picture text -----**<br>
V o<br>150<br>125<br>100<br>V oB tr = 80 V<br>75 pT YT<br>V oB tr = 50 V<br>50<br>25<br>0 25     50     75   100    125   150         V i<br>**----- End of picture text -----**<br>


_Fig. 1 V_ o _versus V_ i _depending on V_ oB tr 

The inrush current is not limited, but the output capacitor  of the IBX15 and the input capacitors of the connected DC-DC converters are relatively small. 

The switching frequency is approximately 2 × 200 kHz (inter leaved). A current limiting circuit protects the main FETs from overload. However, the output is not short-circuit proof. 

The logic is biased by an auxiliary converter with a switching frequency of approx. 350 kHz. The boost voltage _V_ oB can be trimmed by resistor _R_ BA to a higher level _V_ oB tr. This allows together with an external storage capacitor _C_ hu the realization of an interruption time as requested by the railway standard EN 50155. No other components are needed. 

**==> picture [510 x 236] intentionally omitted <==**

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BCD.00197 Rev AG, 09-Mar-2021 

© 2021 Bel Power Solutions & Protection 

Page 2 of 11 

IBX15 Series Boost Converters 

## **Electrical Input Data** 

General conditions: 

_- T_ A = 25 °C, unless _T_ C is specified. 

_Table 2: Input data_ 

|_Table 2: Input data_|_Table 2: Input data_|_Table 2: Input data_||||
|---|---|---|---|---|---|
|**Model**<br>~~Os~~|||**24IBX15-50-0G**<br>~~Os~~|**36IBX15-50-0G**<br>~~Os~~|**Unit**<br>~~Os~~|
|**Characteristics**<br>~~I~~||**Conditions**<br>~~I~~|**min**<br>**typ**<br>**max**<br>~~I~~|**min**<br>**typ**<br>**max**<br>~~I~~|~~I~~|
|_V_i<br>~~I~~<br>~~GO~~|Operating input voltage<br>~~I~~<br>~~GO~~|~~I~~<br>~~GO~~|16.8<br>160<br>~~I~~<br>~~GO~~|25.2<br>160<br>~~I~~<br>~~GO~~|V<br>~~I~~<br>~~(~~|
|_V_i 2s<br>~~GO~~<br>~~a~~|Temporary input voltage<br>~~GO~~<br>~~sO~~|2 s<br>~~GO~~<br>~~sO~~|12<br>168<br>~~GO~~<br>~~sO~~|21.3<br>168<br>~~GO~~<br>~~sO~~||
|_V_i abs<br>~~a~~|Input voltage limits|2 s, without damage|176<br>~~(~~|176<br>~~(~~||
|_∆Vi o_<br>~~a~~<br>~~a~~|Voltage drop_V_i_–_ _V_o|_V_i>_V_oB|1<br>~~(~~|1<br>~~(~~||
|_I_i<br>~~a~~|Typical input current<br>~~a~~|_V_i min, _I_o nom<br>~~a~~|8<br>~~(~~<br>~~a~~|6<br>~~(~~|A<br>~~(~~|
|_C_i<br>~~a~~<br>~~a~~|Input capacitance<br>~~a~~<br>~~a~~|for surge calculation<br>~~a~~<br>~~a~~|~~a~~<br>~~a~~|4|µF|
|_t_start<br>~~a~~|Start-up time of_V_o<br>~~a~~<br>~~GO~~|_V_i→_V_i minor after shutdown<br>~~a~~<br>~~GO~~|500<br>~~a~~<br>~~GO~~|500<br>~~GO~~|ms<br>~~GO~~|
|_P_i 0<br>~~fp~~|No-load input power<br>~~fp~~|_V_i min–_V_i max, _I_o= 0<br>~~fp~~|1.0<br>1.5<br>~~fp~~|1.0<br>1.5<br>~~fp~~|W<br>~~fp~~|
|_P_i SD<br>~~fp~~<br>~~a~~|Input power with shutdown<br>~~fp~~|_V_i min–_V_i max, _V_PUL= 0<br>~~fp~~|~~fp~~|~~fp~~||



## **Input Protection and Fuse** 

No fuse is incorporated inside the converter. Consequently,  an external fuse or a circuit breaker at system level should be installed to protect against severe defects; see table 3. 

Reverse polarity protection is provided by an antiparallel diode across the input, causing the external input fuse or circuit breaker to trip. 

**Note:** The fuses in table 4 apply to batteries with _V_ i nom = 24 or 36  V. In applications using batteries with higher voltage, fuses with lower current may suit better. 

_Table 3: Recommended external fuses in the non-earthed input line_ 

|**Converter model**|**Fuse type**|
|---|---|
|24IBX15-50-0G|Littlefuse 218, 10 A / 250 VAC, fast|
|36IBX15-50-0G|Littlefuse 218, 8 A / 250 VAC, fast, or:<br>Schurter SPT 8 A, 300 VDC|



## **Programmable Undervoltage Lockout PUL** 

The programmable input undervoltage lockout (PUL, pin 17) should be adjusted adequately in order to limit the input current. Table 4 shows the values of the resistor _R_ PUL, connected between PUL and Vi–, versus the resultant minimum input voltage and the resultant maximum input current. 

**Note:** If PUL is connected to Vi–, the converter is disabled (shutdown). 

_Table 4: Typical values for R_ PUL _and the resultant turn-on input voltage V_ i LO _. Valid for version V105 (Rev. AE) or later._ 

|_Table 4: Typical values for R_PUL_and the resultant turn-on input voltage V_|_Table 4: Typical values for R_PUL_and the resultant turn-on input voltage V_|_and the resultant turn-on input voltage V_|_and the resultant turn-on input voltage V_|
|---|---|---|---|
|**24IBX15-50-0G**||**36IBX15-50-0G**||
|**_R_ PUL [kΩ]**|**_V_i LO [V]**|**_R_ PUL [kΩ]**|**_V_i LO [V]**|
|∞|15|∞|23|
|110|18|100|27|
|68|20|56|30|
|43|23|36|34|
|27|27|27|38|



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IBX15 Series Boost Converters 

## **Efficiency** 

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η [%]<br>100 JM121<br>Vi = 36 V<br>e e<br>90 a ae ee ee ee<br>p7tooouF Vi = 24 V<br>80 ee ee ee<br>ee ee ee ee<br>70 ee ee ee<br>ee ee ee<br>60 es ee<br>0 0.2 0.4 0.6 0.8 Io / Io nom<br>**----- End of picture text -----**<br>


_Fig. 3_ 

_Efficiency versus input voltage and output current (24IBX15-50-0G)_ 

## **Interruption Time** 

The interruption time of a system comprised of a step-up converter IBX15 (Rev. AB or later) and connected converters can easily be increased by an external capacitor _C_ hu and adjusting the boost voltage _V_ oB tr to a higher level. 

As an example, fig. 4 shows a 36IBX15-50 supplying a DC-DC con verter 110IMY70-12. 

Formula for the external boost capacitor _C_ hu: 

**==> picture [108 x 25] intentionally omitted <==**

whereas: 

_C_ hu = external boost capacitance [mF] _P_ o = output power = input power of the supplied con verter [W] _t_ h u = interruption or hold-up time [ms] _V_ i min = min. input voltage of supplied converters  [V] _V_ oB tr = boost voltage trimmed using _R_ BA  [V] 

**==> picture [478 x 153] intentionally omitted <==**

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[V]<br>120 a JM122<br>100 ee ee aee V o ee<br>JM123<br>+ + + 80<br>£2 b a ee ee eee<br>Input 36IBX15 2 + ? 110IMY70-12 Output 1 IN ff<br>C hu 60<br>V Chu<br>R PUL R BA 40<br>20 ee—t—}—}—_ +<br>a ee<br>0 PoP t<br>0 10 20 30 ms<br>**----- End of picture text -----**<br>


_Fig. 4 System with increased interruption time_ 

_Fig. 5_ 

_Increased interruption time. V_ i = _110 V, C_ hu = _560 µF/100 V, P_ o _= 90 W, V_ oB tr _= 80 V, R_ BA _= 0 Ω. (24IBX15-50-0G)_ 

The external boost capacitor is loaded by a current source to the preselected boost voltage _V_ oB tr. This current source is  activated after _V_ o has reached or exceeded _V_ oB tr. If the input voltage is increasing further, the boost capacitor is not charged beyond _V_ oB tr. Consequently, its rated voltage needs not to be much higher than _V_ oB tr. 

In the case of input voltage loss, the output voltage _V_ oB drops rapidly to _V_ oB tr until the diode Dhu connects the output with the boost capacitor, sustaining the output voltage; see fig. 5. As long as voltage of the supplied converter is not affected. _V_ i min of the supplied converter is not undercut (during _t_ hu), the output 

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IBX15 Series Boost Converters 

## **Electrical Output Data** 

General conditions: _- T_ A = 25 °C, unless _T_ C is specified. _V_ i < _V_ oB min, _I_ o < _I_ o nom 

_Table 5: Output data_ 

|_Table 5: Output data_|_Table 5: Output data_|_Table 5: Output data_||||
|---|---|---|---|---|---|
|**Output**|||**24IBX15-50-0G**|**36IBX15-50-0G**|**Unit**|
|**Characteristics**<br>~~eG~~||**Conditions**<br>~~eG~~|**min**<br>**typ**<br>**max**<br>~~eG~~|**min**<br>**typ**<br>**max**<br>~~eG~~|~~eG~~|
|_V_oB r<br>~~eG~~<br>~~a~~|Boost voltage regulated<br>~~eG~~<br>~~a~~|_V_i min,_I_o nom, _R_BA_=_ ∞<br>~~eG~~|49<br>50<br>51<br>~~eG~~|49<br>50<br>51<br>~~eG~~|V<br>~~eG~~<br>~~GO~~|
|_V_oB tr<br>~~a~~<br>~~a~~|Boost voltage trim range<br>~~aes~~<br>~~es~~|depending on_R_BA<br>~~es~~<br>~~rs~~|49<br>80<br>~~es~~<br>~~GO~~|49<br>80<br>~~es~~<br>~~GO~~||
|_I_o nom<br>~~a~~<br>~~a~~|Nominal output current<br>~~aes~~<br>~~es~~|_V_i min_– V_i max,_V_oB r<br>~~es~~<br>~~rs~~|1.6<br>~~es~~<br>~~GO~~|2.2<br>~~es~~<br>~~GO~~|A<br>~~GO~~|
|_v_ow<br>~~a~~<br>~~ST~~<br>~~a~~|Static line / load regulation<br>~~es ~~<br>~~ST~~<br>~~a~~<br>~~ee~~|_V_i min_– V_oB r, 0 –_I_o nom<br> ~~rs~~<br>~~ST~~|±1<br>±2<br>~~GO~~<br>~~ST~~|±1<br>±2<br>~~GO~~<br>~~ST~~|V<br>~~GO~~<br>~~ST~~|
|_v_od<br>~~ST~~<br>~~a~~|Dynamic line / load regulation<br>~~ST~~<br>~~a~~<br>~~ee~~|~~ST~~|±2<br>~~ST~~|±2<br>~~ST~~||
|_t_d<br>~~ST~~<br>~~a~~<br>~~a es~~<br>~~a~~|Dynamic recovery time<br>~~ST~~<br>~~a~~<br>~~ee~~<br>~~es~~<br>~~r~~|~~ST~~<br>~~es~~<br>~~rs~~|2<br>~~ST~~<br>~~es~~|2<br>~~ST~~<br>~~es~~|ms<br>~~ST~~<br>~~es~~|
|_I_BC<br>~~a~~<br>~~—~~|Current to boost capacitor<br>~~r~~<br>~~—~~|_V_o≥ _V_oB r<br>~~rs~~<br>~~a —————E~~|3.9<br>4.3<br>4.8<br>~~—————E~~|3.9<br>4.3<br>4.8<br>~~—————E~~|mA<br>~~—————E~~|
|_t_hu<br>~~a~~<br>~~—~~<br>~~a~~<br>~~Sn~~|Interruption time1<br>~~r~~<br>~~—~~<br>~~ee~~<br>~~Sn~~|_C_hu= 1000 µF,<br>_V_oB tr= 50 V,_V_i=_V_i min<br>~~rs~~<br>~~a —————E~~<br>~~ee~~|-<br>~~—————E~~<br>~~ee~~|-<br>~~—————E~~<br>~~ee~~<br>~~ee~~|ms<br>~~—————E~~<br>~~ee~~|
|_t_loadC<br>~~—~~<br>~~a~~<br>~~Sn~~|Load time for_C_hu 1<br>~~—~~<br>~~ee~~<br>~~Sn~~||-<br>~~—————E~~<br>~~ee~~|-<br>~~—————E~~<br>~~ee~~<br>~~ee~~|s<br>~~—————E~~<br>~~ee~~|
|_t_hu<br>~~—~~<br>~~a~~<br>~~Sn~~<br>~~a~~|Interruption time1<br>~~—~~<br>~~ee~~<br>~~Sn~~<br>~~ee~~|_C_hu= 560 µF,<br>_V_oB tr= 80 V,_V_i=_V_i min<br>~~a —————E~~<br>~~ee~~|10<br>11<br>~~—————E~~<br>~~ee~~<br>~~ee~~|10<br>11<br>~~—————E~~<br>~~ee~~<br>~~ee~~<br>~~ee~~|ms<br>~~—————E~~<br>~~ee~~|
|_t_loadC<br>~~Sn~~<br>~~a~~|Load time for_C_hu 1<br>~~Sn~~<br>~~ee~~||12<br>15<br>18<br>~~ee~~|12<br>15<br>18<br>~~ee~~<br>~~ee~~|s|



## **Parallel or Series Operation** 

Not possible. 

## **Thermal Considerations** 

If a converter, mounted on a PCB, is located in free, quasi-stationary air (convection cooling) at the indicated maximum ambient temperature _T_ A max (see table _Temperature spe ci fications_ ) and is operated at its nominal operating conditions, the case temperature measured at the measuring point of case temperature _T_ C (see _Mechanical Data_ ) will approach the indicated value _T_ C max after the warm-up phase. However, the relationship between a system. The thermal conditions are influenced by input voltage, output current, airflow, temperature of surrounding components _T_ A and _T_ C depends heavily on the conditions of operation and integration into and surfaces, and the properties of the printed circuit board. _T_ A max is therefore only an indicative value. 

**Caution:** The case temperature _T_ C measured at the measuring point of case temperature _T_ C (see _Mechanical Data_ ) shall under no circumstances exceed the specified maximum value. The installer must ensure that under all operating conditions _T_ C remains within the limits stated in the table _Temperature specifications._ 

## **Overtemperature Protection** 

The converters are protected from possible overheating by an internal temperature monitoring circuit. It shuts down the converter above the internal temperature limit, and automatically restarts, after the temperature dropped. 

**==> picture [205 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
I o /  I o nom<br>1.0 JM180<br>Option Z<br>0.8<br>PLETE NS<br>0.6 SERENE<br>0.4 PTT TTT TNT TT<br>0.2<br>0  20       40        60         80    100        °C T A<br>**----- End of picture text -----**<br>


_Fig. 6a 24IBX15: I_ o _versus temperature I_ o nom = _1.6 A, V_ i  = _16.8 V_ , _V_ oB tr _= 50 V_ 

**==> picture [205 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
I o /  I o nom<br>1.0 JM181<br>Option Z<br>0.8<br>PLT ITT IEN<br>0.6 PLT ET EE AN TLE<br>0.4 BERR RRENEEE<br>0.2<br>0  20       40        60         80    100        °C T A<br>**----- End of picture text -----**<br>


_Fig. 6b 36IBX15: I_ o _versus temperature I_ o nom = _2.2 A, V_ i  = _25.2 V_ , _V_ oB tr _= 50 V_ 

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IBX15 Series Boost Converters 

## **Auxiliary Functions** 

## **Boost Voltage Adjust** 

The regulated boost voltage _V_ oB tr can be adjusted by an external adjust resistor _R_ BA; see fig. 1. The values of _R_ BA are specified in table 6. 

_Table 6: Typical values for R_ BA _and the resultant boost voltage V_ oB tr and the possible output current _I_ o _._ 

|**R BA [kΩ]**|**24IBX15-50-0G**<br>**VoB tr [V]**<br>**Io [A]**|**24IBX15-50-0G**<br>**VoB tr [V]**<br>**Io [A]**|**36IBX15-50-0G**<br>**VoB tr [V]**<br>**Io [A]**|**36IBX15-50-0G**<br>**VoB tr [V]**<br>**Io [A]**|
|---|---|---|---|---|
|∞|50|1.60|50|2.20|
|121|55|1.42|55|1.95|
|46.5|60|1.27|60|1.75|
|23|65|1.05|65|1.45|
|11.2|70|0.92|70|1.26|
|4.3|75|0.84|75|1.16|
|0|80|0.79|80|1.08|



Of course, the real output voltage _V_ o follows _V_ i  when _V_ i is higher than _V_ Br. However, the voltage on pin 11 will never exceed the adjusted value of _V_ oB tr. The external capacitor _C_ hu must only be rated to _V_ oB tr. 

The max. output current will decrease with higher _V_ oB tr, but the output power remains constant, because the supplied 110IMY converters need lower input current with higher input voltage. 

## **Out-OK Signal** 

An open-collector signal controls the function of the boost converter. When _V_ oBr is exceeded, the D-output is connected with a FET to Go– (pin 15); see table 7. 

_Table 7: Out-OK data_ 

|_Table 7: Out-OK data_|_Table 7: Out-OK data_||||
|---|---|---|---|---|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**Unit**|
|VOK|Out-OK voltage|Output okay, IOK< 50 mA|0.3<br>0.5|V|
|IOK|Out-OK current|Output fail, VOK≤ 80 V|15<br>60|µA|



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IBX15 Series Boost Converters 

## **Electromagnetic Compatibility (EMC)** 

A suppressor diode together with the input choke form an effective protection against high input transient voltages which typically occur in many installations, but especially in battery-driven mobile ap plic ations. The auxiliary converter has a separate input filter. 

## **Electromagnetic Immunity** 

_Table 8: Electromagnetic immunity (type tests)_ 

|**Phenomenon**|**Basic**<br>**Standard**|**Level**|**Coupling mode**1|**Value**<br>**applied**|**Waveform**|**Source**<br>**imped.**|**Test procedure**|**In**<br>**oper.**|**Perf.**<br>**crit.** 2|
|---|---|---|---|---|---|---|---|---|---|
|Electrostatic<br>discharge (to case)|IEC/EN<br>61000-4-23|-|contact discharge|±6000 Vp|1/50 ns|330 Ω<br>150 pF|10 pos. & 10 neg.<br>discharges|yes|B|
|Electromagnetic<br>field|IEC/EN<br>61000-4-3|x4|antenna|20 V/m|AM 80% / 1 kHz|N/A|80 – 1000 MHz|yes|A|
|||5|antenna|20 V/m|AM 80% / 1 kHz|N/A|800 – 1000 MHz|yes|A|
|||||10 V/m|||1400 – 2000 MHz|||
|||||5 V/m|||2000 – 2700 MHz|||
|||||3 V/m|||5100 – 6100 MHz|||
|Electrical fast<br>transients / burst|IEC/EN<br>61000-4-4|36|direct coupling<br>+i/-i/c|±2000 Vp|bursts of 5/50 ns;<br>5 kHz over 15 ms;<br>burst period: 300 ms|50Ω|60 s positive<br>60 s negative<br>transients per<br>coupling mode|yes|A|
|Surges|IEC/EN<br>61000-4-5|3|+i/c, -i/c|±2000 Vp|1.2 / 50 µs|42Ω<br>0.5 μF|5 pos. & 5 neg.<br>surges per<br>coupling mode|yes|B|
|||2|+i/-i|±1000 Vp||||yes|B|
|Conducted<br>disturbances|IEC/EN<br>61000-4-6|37|+i/-i/c|10 Vrms|AM 80% / 1 kHz|150Ω|0.15 – 80 MHz|yes|A|



> 1 i = input, o = output, c = case (not for option Z) 2 A = normal operation, no deviation from specification, B = temporary deviation from specs. possible. 

3 Corresponds to EN 50121-3-2:2016 table 5.3 and exceeds EN 50121-4:2016 table 2.4. 

4 Corresponds to EN 50121-3-2:2016 table 5.1 and exceeds EN 50121-4:2016 table 2.1. 

5 Corresponds to EN 50121-3-2:2016 table 5.2 and EN 50121-4:2016 table 2.2. 

6  Corresponds to EN 50121-3-2:2016 table 3.2 and EN 50121-4:2016 table 4.2. 

7 Corresponds to EN 50121-3-2:2016 table 3.1 and EN 50121-4:2016 table 4.1. 

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IBX15 Series Boost Converters 

## **Electromagnetic Emissions** 

The EMC requirements must be observed at the end product system level. However, the company tests the converters to EMC standards. The integrated input filter reduces the reflected input current and improves EMC features. Further improvements are possible by adding simple external filters; see fig. below. 

The large input capacitor C1 (720 µF /200 V) provides stability during surge tests. The other components are: 

C51 = C52 = 10 nF / 300 V, Y2 

C2 = 4.7 nF / 300 V, Y2 

C3 = 3 µF / 250 V, X7R C4 = 5 µF / 250 V, X7R L1 = 4.4 mH 

**==> picture [184 x 139] intentionally omitted <==**

**----- Start of picture text -----**<br>
C51<br>+<br>L1<br>C4 C3 + C1<br>V i IBX15<br>- °<br>C52 C2<br>case<br>I 7<br>**----- End of picture text -----**<br>


_Fig. 7 External filter for compliance with EN 50121-3-2_ 

_Fig. 8_ 

_Conducted emissions of 24IBX15-50-0G. VV, 2 A; case connected to PE; with input filter fig. 7_ i _= 24 V, V_ o _= 50_ 

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IBX15 Series Boost Converters 

## **Immunity to Environmental Conditions** 

_Table 9: 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|Converter<br>not operating|
|Ad|Cooling test<br>steady state|EN 50155:2007, clause 12.2.3<br>IEC/EN 60068-2-1|Temperature, duration:<br>-40 °C, 2 h<br>Performance test:<br>+25 °C|Converter<br>not operating|
|Bd|Dry heat test<br>steady state|EN 50155:2007, clause 12.2.4<br>IEC/EN 60068-2-2|Temperature:<br>70 °C<br>Duration:<br>6 h|Converter<br>operating|
|Ka|Salt mist test<br>sodium chloride<br>(NaCl) solution|EN 50155:2007, clause 12.2.10<br>IEC/EN 60068-2-11<br>class ST2|Temperature:<br>35±2°C<br>Duration:<br>16 h|Converter<br>not 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)|Converter<br>operating|
|Fh|Random vibration<br>broad band (digital<br>control) & guidance|IEC/EN 60068-2-64|Acceleration spectral density:<br>0.05 gn<br>2/Hz<br>Frequency band:<br>8 – 500 Hz<br>Acceleration magnitude:<br>4.9 gn rms<br>Test duration:<br>1.5 h (0.5 h in each axis)|Converter<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)|Converter<br>operating|
||Shock|EN 50155:2007, clause 12.2.11<br>EN 61373 sect. 10<br>class B, body mounted1|Acceleration amplitude:<br>5.1 gn<br>Bump duration:<br>30 ms<br>Number of bumps:<br>18 (3 in each direction)|Converter<br>operating|
||Simulated long life<br>testing at increased<br>random vibration<br>levels|EN 50155:2007, clause 12.2.11<br>EN 61373 sect. 8 and 9<br>class B, body mounted1|Acceleration spectral density:<br>0.02 gn<br>2/Hz<br>Frequency band:<br>5 – 150 Hz<br>Acceleration magnitude:<br>0.8 gn rms<br>Test duration:<br>18 (3 in each direction)|Converter<br>operating|



1 Body mounted = chassis of a railway coach 

## **Temperatures** 

_Table 10: Temperature specifications, valid for an air pressure of 800 – 1200 hPa (800 – 1200 mbar)_ 

|**Model**|**Model**|**Model**|**-0G (with case)**|**-0ZG (open frame)**|**Unit**|
|---|---|---|---|---|---|
|**Characteristics**||**Conditions**|**min**<br>**typ**<br>**max**|**min**<br>**typ**<br>**max**||
|_T_A|Ambient temperature|Converter operating|- 40<br>70|- 40<br>70|° C|
|_T_C, _T_CZ|CZ<br>Case temperature 1||- 40<br>100|- 40<br>120||
|_T_S|Storage temperature|Not operational|- 55<br>85|- 55<br>85||



## **Reliability** 

_Table 11: MTBF and device hours_ 

|**Reliability**<br>_Table 11: MTBF and device hours_|||||||
|---|---|---|---|---|---|---|
|**Ratings**<br>**Case temperature**|**Model**|**Ground benign**<br>**40 °C**|**Ground fixed**<br>**40 °C**<br>**70 °C**||**Ground mobile**<br>**50 °C**|**Unit**|
|MTBF accord. to Bellcore SR-332, issue 1|36IBX15-50|850 000|425 000|160 000|104 000|h|



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IBX15 Series Boost Converters 

## **Mechanical Data** 

Dimensions are in mm (inches). 

Tolerances ±0.3 mm (unless noted) 

European Projection 

Recommended PCB hole diameter for the 1mm square pins: 1.4 mm 

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_Fig. 9 Case Zinc, weight approx. 80 g_ 

_Fig. 10 Open frame (option Z), weight approx. 30 g_ 

## **Safety and Installation Instruction** 

## **Pin Allocation** 

_Table 12: Pin allocation (standard and option Z)_ 

|**Pin**|**Name**|**Description**|
|---|---|---|
|1|Vi+|Pos. input|
|2|Vi+|Pos. input|
|3|Gi-|Neg. input|
|4|Gi-|Neg. input|
|11|Chu|External hold-up capacitor|
|12|Vo+|Pos. output voltage|
|13|Go-|Neg. output (connected to pins 3 and 4)|
|14|-|No pin|
|15|D|Boost function okay|
|16|BA|Boost voltage adjust|
|17|PUL|Programmable undervoltage lockout / inhibit|



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IBX15 Series Boost Converters 

## **Installation Instructions** 

Connection to the system shall be made via a printed circuit board with hole diameters of 1.5 mm for the pins. 

The converter must be connected to a secondary circuit. 

Do not open the converter! 

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

**Note:** To prevent excessive current flowing through the input supply lines in case of a malfunction an external fuse should be installed in a non-earthed input supply line; see table 3. 

## **Standards, Approvals, Isolation** 

The converters have been approved according to the latest edition of IEC/EN 62368-1 and UL/CSA 60950-1. The CE mark is fitted. All pins are tested against the case with 1500 VAC (2120 VDC) for ≥1 s as routine test in the factory according to EN 62911 and IEC/EN 60950. 

The converters are subject to manufacturing surveillance in accordance with the above mentioned standards and with ISO9001:2015. 

CB scheme is available. 

## **Railway Applications** 

To comply with railway standards, all components are coated with a protective lacquer (except option Z). 

## **Protection Degree and Cleaning Liquids** 

The protection degree of the converters is IP 40, except open-frame models (option Z). 

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

However, open-frame models (option Z) leave the factory unlacquered; they may be lacquered by the customer, for instance together with the mother board. Cleaning liquids are not permitted – except washing at room temperature with isopropyl alcohol and de-inonized/destilled water (1 : 1). 

The mother board can also be cleaned, before fitting the open-frame converter. 

**Note:** Other cleaning liquids may damage the adhesive joints of the ferrite cores. 

## **Options** 

Option Z: Open-frame model (no case). 

**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. 

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