B3603 Digital Power Supply Module - 30V 3A DC-DC Step-Down Converter

The B3603 is a digitally controlled DC-DC step-down power supply module that combines a high-speed microcontroller, a 4-digit seven-segment LED display, and a wide-input buck converter into a compact 66mm × 50mm × 21mm board. It accepts an input voltage from 6V to 40V and delivers an adjustable output from 0V to 36V at up to 3A, with voltage and current set precisely through the onboard interface at resolutions of 0.01V and 0.001A. The module supports both constant-voltage (CV) and constant-current (CC) modes, indicated by dedicated LEDs, and can store up to 10 parameter groups for quick recall. Conversion efficiency reaches up to 92%, output ripple is held to 50mV or less, and the 150kHz switching frequency keeps the magnetics compact. Because the B3603 power supply module is a step-down converter, the input must remain at least 1.5V above the output, and sustained currents above 2A require additional heatsinking or forced airflow. With its digital display and programmable limits, this digital step-down module is suited to lab experiments, battery charging, LED driving, and other applications where precise, repeatable voltage and current control are needed.

B3603 power supply module Application

1. Low-cost adjustable lab power supply for prototyping and experiments with 0.01V/0.001A resolution.
2. Solar battery charging and multi-chemistry battery charging (Lead-Acid, Li-ion, NiMH, LiPo) with user-programmed limits.
3. High-power LED driving and constant-current testing of motors, solenoids, and other loads.
4. Embedded projects and benchtop test fixtures requiring a compact, display-equipped step-down source.
5. Educational demonstrations of CV/CC operation and digital power control.

B3603 power supply module Specifications

1. Input voltage: 6V to 40V DC
2. Output voltage: 0V to 36V DC (adjustable)
3. Output current: 0A to 3A (maximum 3A; stable continuous 2A; higher currents require heatsinking)
4. Conversion efficiency: up to 92%
5. Output ripple: ≤50mV
6. Switching frequency: 150kHz
7. Voltage regulation/display resolution: 0.01V
8. Current regulation/display resolution: 0.001A
9. Power display resolution: 0.001W
10. Capacity display resolution: 0.001AH
11. Operating temperature: -40°C to +85°C
12. Short-circuit protection: constant current
13. Input reverse-polarity protection: none (external diode required if needed)
14. Cooling: natural convection below 2A; heatsink or fan above 2A
15. Display: 4-digit seven-segment LED
16. Storage locations: up to 10 parameter groups
17. Dimensions: 66mm × 50mm × 21mm (length × width × height)
18. Weight: approximately 43g