DC 5V-35V 3W 350mA/700mA Constant Current LED Driver Module with PWM Dimming

DC 5V-35V 3W 350mA/700mA Constant Current LED Driver Module with PWM Dimming is a miniature step-down (buck) constant-current LED driver board designed to drive 1W (350mA) or 3W (700mA) high-power LED emitters from a wide 5V to 35V DC supply. Featuring up to 92% switching efficiency, a solder-pad selectable 350mA/700mA output current, and a dedicated logic-level PWM dimming input pin, it allows microcontrollers like Arduino and ESP32 to dim high-wattage series LED strings from 0% to 100% smoothly.

Key Features:

• Selectable 1W (350mA) or 3W (700mA) Constant Current: Delivers 350mA for 1W high-power LEDs or 700mA for 3W high-power LEDs (configured via the onboard current-sensing resistor/jumper).
• Wide 5V to 35V DC Input Range: Drives 1 to 8 high-power LEDs connected in series from a 12V, 24V, or 32V DC power supply (input voltage must be ≥2V–3V higher than total LED string forward voltage).
• Dedicated Logic-Level PWM Dimming Pin: Accepts a 2.5V–5.0V PWM signal (100Hz to 20kHz) from any Arduino/ESP32 GPIO pin for stepless brightness control and remote ON/OFF switching.
• High 92% Buck Efficiency: Switching step-down topology with a shielded SMD inductor runs cool without bulky dropping resistors.
• Open/Short LED Protection & Thermal Shutdown: Built-in thermal regulation protects both the driver IC and expensive COB/star LEDs.

Technical Specifications:

• Driver IC Class: PT4115 / XL4001 / MBI6651 Hysteretic Buck Constant-Current LED Driver
• Input Voltage Range: 5.0V to 35.0V DC
• Output Constant Current: 350 mA ± 5% (for 1W LEDs) / 700 mA ± 5% (for 3W LEDs)
• Output Power Capacity: 1W to 20W (1 to 7–8 Series LEDs depending on VIN)
• PWM Dimming Signal: 0V–0.3V = LED OFF | 2.5V–5.0V = LED ON (Leave PWM pin floating for 100% full brightness)
• Conversion Efficiency: Up to 92%
• Operating Temperature Range: -40°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Fiberglass PCB
• Terminals: Through-Hole Solder Pads (VIN+, VIN-, PWM, LED+, LED-)

Dimensions:

• Length: 35.6 mm
• Width: 20.0 mm
• Height: 7.5 mm
• Weight: ~4.5 g

Pinout and Wiring:

• VIN+ / VIN-: Connect 5V–35V DC supply (must exceed total series LED forward voltage $V_f$ by 2V–3V).
• LED+ / LED-: Connect directly to the high-power LED anode (+) and cathode (-). Warning: Never short LED- to VIN- (ground), as the current sense loop sits on the low side!
• PWM Pin: Connect to microcontroller 3.3V/5V PWM pin (share VIN- with microcontroller GND), or leave unconnected for continuous full brightness.

Datasheet Reference:

• Primary IC Datasheet: PT4115 30V 1.2A Step-Down High-Brightness LED Driver Specification

Commonly Used in:

• 1W and 3W High-Power Star LED Spotlights & Work Lamps
• Arduino / ESP32 PWM-Controlled Aquarium & Reef Lighting
• Machine Vision Strobe Illuminators and Microscope Ring Lights
• 12V / 24V Solar & Automotive High-Power LED Drivers

Applications:

• Enables an Arduino or ESP32 to simulate sunrise/sunset dimming curves on 1W/3W high-power aquarium or horticultural LEDs via a single PWM wire.
• Drives up to six 3W white LEDs in series (~20V forward drop) from a 24V DC power supply at a rock-steady 700mA constant current.
• Replaces inefficient heat-generating power resistors in 12V automotive and marine LED fixtures.

Equivalent Models:

• 250W 10A DC-DC Step-Up Boost Constant Current LED Driver Power Module: High-power boost CC/CV driver for 30V–50V 50W/100W COB LEDs.
• LM2596 3A CC/CV Adjustable Step-Down Buck Converter Power Supply Module: Potentiometer-adjustable 0A–3A CC/CV buck driver.

Package Includes:

• 1 × DC 5V-35V 3W 350mA/700mA Constant Current LED Driver Module with PWM Dimming