PWM Control Board LED Driver 30-1500mA Constant Current Module
= Adjustable Current Driver for 18650 Lithium-Ion Batteries =
This PWM control board provides constant current regulation from 30mA to 1500mA, designed for LED driving with 3.3V, 3.7V, and 5V DC sources. Ideal for 18650 lithium-ion powered lighting projects.
Wide Current Range - Adjustable 30mA to 1500mA output
Constant Current Design - Stable LED brightness
Set current before connecting LED load
Use PWM input for brightness dimming
Do not exceed 1500mA output rating
= Technical Specifications =
| Parameter | Value |
|---|
| Output Current | 30mA to 1500mA adjustable |
| Input Voltage | 3.3V to 5V DC |
| Battery Type | 18650 lithium-ion compatible |
| Control Method | PWM and potentiometer |
| Efficiency | 85% typical |
| Protection | Overcurrent and thermal |
| Dimensions | 35mm x 20mm |
= Key Features =
Constant Current Regulation - Protects LEDs from overcurrent
Wide Adjustment Range - 30mA to 1500mA via trim pot
PWM Dimming Input - Control brightness externally
Battery Friendly - Works with 3.7V 18650 cells
Small Form Factor - Fits compact enclosures
== Applications ==
- High-power LED flashlights
- 18650 battery lamp builds
- LED strip lighting
- Portable work lights
- Headlamp drivers
- DIY lighting projects
Universal Voltage - Works with 3.3V, 3.7V, 5V
LED Protection - Prevents thermal runaway
√ Potentiometer included for adjustment
√ PWM input for external dimming
√ Overcurrent protection built-in
= Connection Guide =
Terminal connections:
- IN+: Battery positive input
- IN-: Battery negative input
- OUT+: LED positive output
- OUT-: LED negative output
- PWM: Dimming signal input
Measure current with multimeter in series
Use 10kHz PWM signal for flicker-free dimming
Always connect load before power
Do not operate without LED attached
= Setting Output Current =
Adjustment procedure:
- Connect power source
- Attach multimeter in series with LED
- Turn trim potentiometer
- Monitor current reading
- Set desired 30-1500mA value
For current calculation:
- Voltage drop across sense resistor
- Trim pot adjusts reference voltage
- Higher resistance = lower current
- Lower resistance = higher current
Precise Setting - Use multimeter for accuracy
Wide Range - Suitable for various LED types
Efficient driving for maximum runtime
Stable output for consistent light
√ Pre-calibrated to 350mA default
√ Screw terminals for secure wiring
√ Works with any LED up to 5W
= PWM Dimming Instructions =
External dimming:
- Apply PWM signal to PWM pin
- Frequency: 100Hz to 20kHz
- Duty cycle: 0% to 100%
- Higher duty = brighter output
Use Arduino PWM output
Use 555 timer for manual dimming
Do not exceed 5V on PWM input
Ensure PWM signal ground shares common
= Common LED Compatibility =
Suitable LEDs:
- 1W LEDs (350mA typical)
- 3W LEDs (700mA typical)
- 5W LEDs (1000mA typical)
- COB arrays up to 5W
Universal Driver - Works with most single LEDs
Adjustable Output - Match any LED current
Tested with all common LED types
Reliable constant current source
√ Input reverse polarity protection
√ Thermal shutdown protection
√ Short circuit safe operation
= Troubleshooting =
No output:
- Check input voltage
- Verify LED connections
- Avoid open circuit condition
Current not adjusting:
- Turn trim pot fully
- Check multimeter setup
- Avoid faulty pot connection
Flickering output:
- Add input capacitor
- Check PWM signal
- Avoid unstable power source
