B78E03-0R5-R3

B78EXX-0R5-R3 Series Non-isolated DC-DC Converters 

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## **Description** 

The B78EXX-0R5-R3 Series are non-isolated DC/DC converters suited to replace 0.5 Amp LM78xx linear regulators. Designed with highly efficiency, allow the operating temperature range of these units to be -40°C to +85°C in a 11.6×7.5×10.2mm non-conducted black plastic case. Further features include wide 6 - 36VDC input voltage range, short-circuits protection and over temperature protection. 

## **Features** 

- ⚫ 6 - 36VDC wide input range 

- ⚫ Pinout compatible with LM78xx linear regulators 

- ⚫ High Efficiency up to 97% 

- ⚫ Output Short Circuit Protection: Hiccup and Auto Recovery 

- ⚫ Over Temperature Protection 

- ⚫ Lead Free Design, RoHS Compliant 

- ⚫ Designed according to IEC/EN/UL 62368-1 

Electrical Specification @ 25[o] C 

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|||||||||
|---|---|---|---|---|---|---|---|
|Output|Output|Current|(mA)|[(1)]|Efficiency (%)|[(2)]|Capacitive|
|Model   Number|Input Voltage Range|Load(uF)|
|Voltage(V)|
|Min. Load|Full Load|Vin_Min.|Vin_Max.|Max.|
|B78E03-0R5-R3|6-36V, nominal 24V|3.3|0|500|90|80|680|
|rs|
|B78E05-0R5-R3|6.5-36V, nominal 24V|5|0|500|94|84|680|
|es|
|B78E6R5-0R5-R3|9-36V, nominal 24V|6.5|0|500|94|84|470|
|es|
|B78E09-0R5-R3|12-36V, nominal 24V|9|0|500|96|90|470|
|Rees|
|B78E12-0R5-R3|15-36V, nominal 24V|12|0|500|97|92|100|
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|B78E15-0R5-R3|18-36V, nominal 24V|15|0|500|97|94|100|
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Input Specifications Input voltage Input filter 

See table Capacitor type 

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Non-isolated DC-DC Converters 

## B78EXX-0R5-R3 Series 

|Environmental Specifications|||
|---|---|---|
|Operating ambient temperature||-40°C to +85°C (with derating)|
|Maximum case temperature||+105°C|
|Storage temperature range||-50°C to +125°C|
|Relative humidity||95% RH max.|
|Temperature coefficient||±0.03% / °C max.|
|Output Specifications|||
|Output current||500mA max.|
|Voltage accuracy|0 -100% load and 24Vin|±1% typ.<br>±3% max.|
|Minimum load||Not required|
|Line regulation|Full load|±0.75% max.|
|Load Regulation|10 - 100% load and 24Vin|±1% max.|
|Ripple and Noise (20MHz Bandwidth)||150mVp-p max.|
|Capacitive load||See table|
|Short Circuit Protection||Hiccup, automatic recovery|
|Over Temperature Protection|The IC Thermal Shutdown Temperature|150°C typ.|
|General Specifications|||
|Efficiency||See table|
|Switching frequency (Fixed)|Pulse width modulation (PWM)|410kHz|
|Reliability, calculated MTBF||10 × 105hrs|
|Physical Specifications|||
|Case material||Plastic (UL94 V-0)|
|||0.46 × 0.295 × 0.4 Inch|
|Dimensions|||
|||(11.6 × 7.5 × 10.2 mm)|
|Weight||1.6g (0.057oz) typ.|



## Note: 

1. Io below this value will not damage these converters, however, they may not meet all listed specifications. 

2. Typical value, tested at nominal input and full load. 

3. Specifications subject to change without notice. 

4. This power module is not internally fused. The input line fuse must always be used. 

5. When the input voltage is higher than 30V or in case of long input lines or hot plug-in requirements, 33uF high frequency and low resistance electrolytic capacitor must be attached to the input during test or operation. 

6. In the process of testing or using, it is necessary to ensure that the "GND" pin of the product is well connected to the GND of the power supply, otherwise the product will be damaged. 

7. DO NOT use it in overload condition. 

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Non-isolated DC-DC Converters 

## B78EXX-0R5-R3 Series 

## **Power Derating Curve** 

## **Process and Materials** 

1. Storage Temperature: Refer to the specification for details 

2. Compliance to J-STD: 

- A. J-STD-002: Solderability of Dipping at 255~260°C 

- B. J-STD-020: Moisture Sensitive Level 1 

3. All parts are packaged in tubes - see page 7 for details 

4. For all electrical characteristics, curves and applications, please refer to the detailed spec. 

5. Lead Frame: Cooper Alloy Underplated: Half Hard Ductile Nickel 40-118" (1.0 - 3.0um) 

Over plated: 100% Tin electro-deposited per 240~400u" (6~10um) min 

Finish: Matte finish 100% Tin solder 

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B78EXX-0R5-R3 Series 

Non-isolated DC-DC Converters 

## **Mechanical** 

## **B78EXX-0R5-R3** 

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Pinout<br>Pin  Function<br>1  Vin<br>2  GND<br>3  Vout<br>All dimensions in mm<br>Tolerances: ±0.5<br>Pin dimension tolerances: ±0.10<br>**----- End of picture text -----**<br>


## **Test Configurations** 

All specifications are typical at nominal input, full load and 25°C unless otherwise stated. 

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A A<br>DC  DC/DC<br>V V Load<br>Power Supply converter<br>**----- End of picture text -----**<br>


- DC Power Supply: It offers a wide voltage and current range precisely. 

- Current meter (A): Accuracy➔ 200μA ~ 200mA 4 ranges ± (0.2% rdg + 2 digits) 

2000mA ~ 20A  2 ranges ± (0.3% rdg + 2 digits). 

- Voltage meter (V): Accuracy➔ ± (0.03% rdg + 4 digits). 

◎ Load: At full load. 

- Wires: The resistance of the wires must be small. 

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Non-isolated DC-DC Converters 

## B78EXX-0R5-R3 Series 

## 1. Ripple and Noise: as shown below. The bandwidth is 0-20MHz. 

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Noise 32.0m¥ Ripple&Noise<br>CHe Off. v<br>| © Fise Time<br>, ; CHI 4<br>oy ' } PP<br>Ripple<br>**----- End of picture text -----**<br>


Output Ripple&Noise measurement test circuit: as shown below. 

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Copper strip<br>DC/DC<br>Co Oscilloscope Load<br>converter<br>Copper strip<br>**----- End of picture text -----**<br>


   - Co: usually 1uF MLCC and 10uF tantalum capacitor. 

2. Temperature derating curve: The DC-DC converter will operate over a wider temperature range if less power is drawn from the output and the device is already running. The temperature derating curve shows the operating power-temperature range. As shown below. 

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B78EXX-0R5-R3 Series Non-isolated DC-DC Converters 

## 3. Application circuit: as shown below. C1=10uF/50V MLCC, C2 =22uF/25V MLCC. 

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DC-DC<br>+Vin +Vout<br>1 converter 3<br>2<br>C1 C2 Load<br>GND<br>**----- End of picture text -----**<br>


4. EMC Filter Suggestion according to EN55032 CLASS B: 

|MOV|L1|C0|C01|L2|C1|C2|
|---|---|---|---|---|---|---|
|20D470K|300uH|470uF/50V|4.7uF/50V<br>MLCC|5mH|10uF/50V<br>MLCC|22uF/25V<br>MLCC|



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## B78EXX-0R5-R3 Series 

Non-isolated DC-DC Converters 

## **Wave Soldering Temperature Curve** 

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° C<br>300<br> 255°C-265°C<br>   3.0~5.0sec<br>270<br>240<br>210<br>180<br>150<br>120 100-110°C<br>90 90°C<br>5°CMAX<br>60<br>30-50sec<br>30<br>60-90sec    preheat area<br>0<br>20 40 60 80 100 120 140 160 180 200 sec<br>**----- End of picture text -----**<br>


## **Carton Package** 

## **B78EXX-0R5-R3** 

## For More Information: 

Americas-prodinfonetworkamericas@pulseelectronics.com | Europe-comms-Apps-Europe@pulseelectronics.com |Asia-prodinfonetworkapac@pulseelectronics.com 

Performance warranty of products offered on this datasheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned herein maybe trademarks or registered trademarks of their respective owners. © Copyright, 2021. PulseElectronics, Inc. All rights reserved. 

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