PXO7812C-500-M-TR

**date** 07/14/2025 **page** 1 of 6 

## **SERIES:** PXO78C-500-M **DESCRIPTION:** NON-ISOLATED DC SWITCHING REGULATOR **│** 

## **FEATURES** 

- 0.5 A current output 

- ultra-thin, open-frame SMD package, thickness ≤3.5 mm 

- high efficiency up to 95% 

- no-load input current as low as 0.2 mA 

- continuous short-circuit protection 

- certified to EN/IEC 62368-1 

|**MODEL**<br>CE|ER|**voltage**|**input**<br>**voltage**|**output**<br>**voltage**|**output**<br>**current**|**output**<br>**power**|**ripple**<br>**& noise1**|**efficiency3**|
|---|---|---|---|---|---|---|---|---|
|||**typ**|**range**||**max**|**max**|**max**|**typ**|
|||(Vdc)|(Vdc)|(Vdc)|(mA)|(W)|(mVp-p)|(%)|
|PXO7803C-500-M||24|4.75~36|3.3|500|1.65|100|92|
|PXO7805C-500-M||24|6.5~36|5|500|2.5|150|93|
|PXO7809C-500-M||24|12~36|9|500|4.5|150|93|
|PXO7812C-500-M||24|15~36|12|500|6.0|150|94|
|PXO7815C-500-M||24|19~36|15|500|7.5|150|95|



- Notes: 1. Tested at nominal input, 20 MHz bandwidth, 20~100% load for 3.3 Vdc model, 10~100% load for all other models. 

2. Measured at min Vin, full load. 

3. All specifications are measured at Ta=25°C, humidity < 75%, nominal input voltage, and rated output load unless otherwise specified. 

## **PART NUMBER KEY** 

## **- PX O 78 XX C 500 - M - TR** 

Base Number Packaging Option: TR = tape & reel Output Voltage Output Current Packaging Style: SMD 

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**CUI Inc │ SERIES:** PXO78C-500-M **│ DESCRIPTION:** NON-ISOLATED DC SWITCHING REGULATOR 

**date** 07/14/2025 **│ page** 2 of 6 

## **INPUT** 

|**INPUT**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating input voltage|||24|36|Vdc|
|input reverse polarity protection|no|||||
|no-load input current|||0.2|1.5|mA|
|flter|capacitor flter|||||
|remote on/of4|module on<br>module of<br>CTRL pin open or pulled high (TTL 3.2~8 Vdc)<br>CTRL pin connected to GND or pulled low (0~0.8 Vdc)|||||
|remote on/of current|input current when of||30|100|µA|
|Notes:<br>4. The control pin voltage is referenced to input GND.||||||
|**OUTPUT**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|maximum capacitive load||||680|μF|
||at full load, input voltage range|||||
|voltage accuracy|3.3 Vdc output model||±2|±4|%|
||all other models||±2|±3|%|
|line regulation|at full load, input voltage range||±0.2|±0.4|%|
||at nominal input, 10~100% load|||||
|load regulation|3.3, 5 Vdc output model||±0.6||%|
||all other output models||±0.3||%|
|switching frequency|at nominal input voltage, full load||500||kHz|
|transient recovery time|at nominal input voltage, 25% load step change||0.2|1|ms|
|transient response deviation|at nominal input voltage, 25% load step change||±50|±200|mV|
|temperature coefcient|at operating temperature -40~85°C|||±0.03|%/°C|
|**PROTECTIONS**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|short circuit protection|continuous, auto recovery|||||
|**SAFETY AND COMPLIANCE**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|safety approvals|certifed to 62368-1: EN/IEC|||||
|conducted emissions|CISPR32/EN55032 CLASS B (see Figure 3-2 for recommended circuit)|||||
|radiated emissions|CISPR32/EN55032 CLASS B (see Figure 3-2 for recommended circuit)|||||
|ESD|IEC/EN 61000-4-2 Contact ±4 kV, perf. Criteria B|||||
|radiated immunity|IEC/EN 61000-4-3 10 V/m, perf. Criteria A|||||
|EFT/burst|IEC/EN61000-4-4 ±1 kV (see Figure 3-1 for recommended circuit), perf. Criteria B|||||
|surge|IEC/EN61000-4-5 line to line ± 1kV (see Figure 3-1 for recommended circuit), perf. Criteria B|||||
|conducted immunity|IEC/EN 61000-4-6 3 Vrms, perf. Criteria A|||||
|MTBF|as per MIL-HDBK-217F, 25°C|2,000,000|||hours|
|RoHS|yes|||||
|**ENVIRONMENTAL**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating temperature|see derating curve|-40||85|°C|
|storage temperature||-55||125|°C|
|storage humidity|non-condensing|5||95|%|
|moisture sensitivity level (MSL)|IPC/JEDEC J-STD-020D.1||Level 1|||



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**CUI Inc │ SERIES:** PXO78C-500-M **│ DESCRIPTION:** NON-ISOLATED DC SWITCHING REGULATOR 

**date** 07/14/2025 **│ page** 3 of 6 

## **SOLDERABILITY** 

|**SOLDERABILITY**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|reflow soldering|Peak temp. ≤245°C, maximum duration time ≤60s over 217°C|||||
|**MECHANICAL**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|dimensions|12.50 x 13.50 x 3.50 [0.492 x 0.531 x 0.138 inch]||||mm|
|weight|||0.92||g|
|cooling method|natural convection|||||



## **MECHANICAL DRAWING** 

units: mm [inch] tolerance: ±0.25[±0.020] 

|PIN-OUT|PIN-OUT|
|---|---|
|PIN|FUNCTION|
|1|+Vin|
|2|GND|
|3|+Vo|
|4|remote on/off|



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**CUI Inc │ SERIES:** PXO78C-500-M **│ DESCRIPTION:** NON-ISOLATED DC SWITCHING REGULATOR 

**date** 07/14/2025 **│ page** 4 of 6 

## **DERATING CURVE** 

**Figure 1** 

## **EFFICIENCY CURVES** 

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**CUI Inc │ SERIES:** PXO78C-500-M **│ DESCRIPTION:** NON-ISOLATED DC SWITCHING REGULATOR 

**date** 07/14/2025 **│ page** 5 of 6 

## **TYPICAL APPLICATION CIRCUIT** 

**Figure 2** 

## **Table 1** 

|**Table 1**|**Table 1**|**Table 1**|
|---|---|---|
|External Capacitor Table|||
|Model Number|C1<br>(µF)|C2<br>(µF)|
|PXO7803C-500-M|10 μF/50 V|22 μF/10 V|
|PXO7805C-500-M|10 μF/50 V|22 μF/16 V|
|PXO7809C-500-M|10 μF/50 V|22 μF/25 V|
|PXO7812C-500-M|10 μF/50 V|22 μF/25 V|
|PXO7815C-500-M|10 μF/50 V|22 μF/25 V|



## **EMC RECOMMENDED CIRCUIT** 

1. To ensure optimal performance, external capacitors C1 and C2 should be installed based on the product’s use environment. These capacitors must be positioned as close as possible to the product’s pin ends. 

2. Refer to Table 1 for the recommended capacitance values of C1 and C2, which can be adjusted as required. Both low-ESR tantalum and electrolytic capacitors are suitable for use. 

3. Hot swapping is not supported by this product, and its output terminal cannot be connected in parallel. 

4. To further minimize output ripple, an “LC” filter network can be added to the output. The recommended inductance value (L) ranges from 10 μH to 47 μH. 

**Figure 3** 

## **Table 2** 

|**Table 2**|**Table 2**|
|---|---|
|Recommended external circuit components||
|FUSE|choose according to actual input current|
|C0 / C3|330 µF/ 50 V|
|LDM1|82 µH|
|C4|see Table 1|
|C1 / C2|10 µF / 50 V|
|LDM2|22 µH|



Notes: For EMC tests we use Part ① in Fig. 3 for immunity and part ➁ for emissions test. Selecting based on needs. 

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**CUI Inc │ SERIES:** PXO78C-500-M **│ DESCRIPTION:** NON-ISOLATED DC SWITCHING REGULATOR 

**date** 07/14/2025 **│ page** 6 of 6 

## **REVISION HISTORY** 

|**rev.**|**description**|**date**|
|---|---|---|
|1.0|initial release|07/14/2025|



The revision history provided is for informational purposes only and is believed to be accurate. 

**==> picture [155 x 34] intentionally omitted <==**

15575 SW Sequoia Pkwy #100 Portland, OR 97224 800.275.4899 

Fax 503.612.2383 Belfuse.com powersupport@belf.com 

CUI offers a two (2) year limited warranty.  Complete warranty information is listed on our website. 

CUI reserves the right to make changes to the product at any time without notice.  Information provided by CUI is believed to be accurate and reliable.  However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. 

CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability.  A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.