B78E05-1R0-R3

**B78EXX-1R0-R3 1.0A** Non-isolated DC-DC Converters 

## **Features** 

- ⚫ 6~36VDC wide input range 

- ⚫ Pin-out compatible with LM78xx linear regulators 

- ⚫ High Efficiency up to 92% 

- ⚫ Output Short Circuit Protection: Hiccup & Auto Recovery 

- ⚫ Over Temperature Protection 

## ¢e~ 

- ⚫ Lead Free Design, RoHS Compliant 

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

## **Description** 

The B78EXX-1R0-R3 Series are non-isolated DC/DC converters suited to replace 1.0 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. 

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

|Model<br>Number|Input Voltage<br>Range|Output<br>Voltage<br>(V)|Output Current (mA)|Output Current (mA)|Eff .(2)(%)|Eff .(2)(%)|Capacitive Load,<br>max.(3)(uF)|
|---|---|---|---|---|---|---|---|
||||Min. Load(1)|Full. Load|Vin_min|Vin_max||
|B78E03-1R0-R3|B78E03-1R0-R3<br>6-36V<br>Nominal:24V|3.3|0|1000|88|78|1000|
|B78E05-1R0-R3|B78E05-1R0-R3<br>7-36V<br>Nominal:24V|5|0|1000|92|84|1000|
|B78E12-1R0-R3|B78E12-1R0-R3<br>15-36V<br>Nominal:24V|12|0|1000|96|92|1000|



|Input Specifications|B78E03-1R0-R3       24V nominal input|6~36V|
|---|---|---|
|Input voltage|B78E05-1R0-R3       24V nominal input|7~36V|
||B78E12-1R0-R3       24V nominal input|15~36V|
|Input filter||Capacitor type|
|Environmental Specifications|||
|Operatingambient temperature||-40°C to +85°C(with derating)|
|Maximum case temperature||+105°C|



E-mail: bothhand_sales@bothhandww.com                                                    A0 (2025/06/12) Web:www.bothhandww.com Page 1 of 6 

**B78EXX-1R0-R3 1.0A** 

Non-isolated DC-DC Converters 

**==> picture [542 x 579] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||
|---|---|---|---|
|Storage temperature range|-50°C to +125°C|
|Relative humidity|95% RH max.|
|Temperature coefficient|±0.03% / °C max.|
|Output Specifications|
|Output current|1A max.|
|±1.5% typ.|
|Voltage accuracy|0 -100% load and 24Vin|3.3V±4% max|
|>=5V±3% max.|
|Minimum load|0mA|
|Line regulation|Full load|±0.75% max.|
|Load Regulation|10 -100% load|±1.5% max.|
|Ripple and Noise (20MHz Bandwidth)|85mVp-p max.|
|Capacitive load|See table|
|Short Circuit Protection(SCP)|Hiccup, automatic recovery|
|Over Temperature Protection(OTP)|The IC Thermal Shutdown Temperature|150°C typ|
|Over Current Protection(OCP)|100%=1A|180~350%|
|General Specifications|
|Efficiency|See table|
|Switching frequency (Fixed)|Pulse width modulation (PWM)|520kHz|
|Dynamic load response|50% Step load|200uS max.|
|60 mV max.(75% to 100% Load|
|Step)(3.3 Vout model)|
|80 mV max.(75% to 100% Load|
|Transient Response|Peak Variation|
|Step)(5 Vout model)|
|120 mV max.(75% to 100% Loa|
|d Step)(12 Vout model)|
|80 mV max.(50% to 100% Load|
|Step)(3.3 Vout model)|
|100 mV max.(50% to 100% Load|
|Transient Response|Peak Variation|Step)(5 Vout model)|
|150 mV max.(50% to 100% Load|
|Step)(12 Vout model)|
|Reliability, calculated MTBF|10 × 10|[5]|Hrs|
|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.|

**----- End of picture text -----**<br>


Attention ： Please don’t use it in overload condition. 

E-mail: bothhand_sales@bothhandww.com                                                    A0 (2025/06/12) Web:www.bothhandww.com Page 2 of 6 

**B78EXX-1R0-R3 1.0A** Non-isolated DC-DC Converters 

## **Power Derating Curve** 

**==> picture [369 x 152] intentionally omitted <==**

**----- Start of picture text -----**<br>
120<br>a<br>nt | | AN. |<br>of——_| f\ |<br>| = arnicmecen |)<br>wt<br>fs ee ee<br>40 2 oOo 2 40 st so 100 10<br>      Ambient Temp.TA ( ℃ )<br>Output Power (%)<br>**----- End of picture text -----**<br>


## **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. 

## **Mechanical Dimensions** 

**==> picture [85 x 67] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pin Assignment<br>Pin  Define<br>1  Vin<br>2  GND<br>3  Vout<br>**----- End of picture text -----**<br>


Unit: mm Tolerance: XX.X= ± 0.5, XX.XX= ± 0.25 

E-mail: bothhand_sales@bothhandww.com                                                    A0 (2025/06/12) Web:www.bothhandww.com Page 3 of 6 

**B78EXX-1R0-R3 1.0A** 

Non-isolated DC-DC Converters 

## **Test Configurations** 

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

**==> picture [478 x 50] intentionally omitted <==**

**----- Start of picture text -----**<br>
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. 

**==> picture [358 x 286] intentionally omitted <==**

**----- Start of picture text -----**<br>
1. Ripple and Noise: as shown below. The bandwidth is 0-20MHz.<br>Tek callow @ Stop M Pos: 33,06rns MEASURE<br>+ CHI<br>Noise 32,0m¥Max Ripple&Noise<br>CH2 Off +<br>| © Fise Tire<br>1 ; : . : 1 : Pk-FkCHI<br>| B1.6m¥ Ripple<br>25.6<br>CHI<br>Freq<br>945. 1kHz<br>CH1 20,0rrivEy M 1,0Q.us CH1 J 30,0<br>28-Dec-09 14240 10H<br>Output Ripple&Noise measurement test circuit: as shown below.<br>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. 

E-mail: bothhand_sales@bothhandww.com                                                    A0 (2025/06/12) 

Web:www.bothhandww.com Page 4 of 6 

**B78EXX-1R0-R3 1.0A** 

Non-isolated DC-DC Converters 

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. 

**==> picture [462 x 577] intentionally omitted <==**

**----- Start of picture text -----**<br>
120<br>9oe ee ee ee | ee<br>of —_—_|_|| |X) J<br>vg [I EM trata convection) |<br>me ee eee ee ee<br>ee eee<br>40 2 0 2 40 6 80 10 19<br>Ambient Temp.TA ( ℃ )<br>Application circuit:: as shown below. C1=10uF/50V MLCC, C2 =22uF/25V MLCC.<br>DC-DC<br>+Vin +Vout<br>1 converter 3<br>2<br>C1 C2 Load<br>GND<br>4.EMC Filter Suggestion according to EN55032 CLASSB:<br>L1 L2<br>Vin O aan Vin +Vo<br>ha<br>a GND<br>MOV<br>GNDO =<br>MOV L1 C0 C01 L2  C1  C2<br>4.7uF/50V  10uF/50V  22uF/10V<br>20D470K 300uH 470uF/50V 5mH<br>MLCC MLCC  MLCC<br>Output Power (%)<br>**----- End of picture text -----**<br>


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

E-mail: bothhand_sales@bothhandww.com                                                    A0 (2025/06/12) Web:www.bothhandww.com Page 5 of 6 

**B78EXX-1R0-R3 1.0A** Non-isolated DC-DC Converters 

## **Carton Package** 

E-mail: bothhand_sales@bothhandww.com                                                    A0 (2025/06/12) Web:www.bothhandww.com Page 6 of 6