PWM Heater Driver

Rajkumar Sharma
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easy
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SKU: EL160932
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The project presented here is a high-current adjustable PWM (Pulse Width Modulation) source, designed to drive various loads such as PTC (Positive Temperature Coefficient) devices, DC motors, solenoids, high-power LEDs, and valves. The project consists of three main components: an SG3525 PWM generator, an MCP4015 MOSFET gate driver, and a MOSFET for load driving.

The key features of this project include adjustable PWM and frequency settings. A multiturn trimmer pot is provided for precise frequency and PWM adjustment, allowing for fine-tuning of the output signal. Screw terminals are included for easy connection of the load and power supply, and an onboard LED indicator provides visual confirmation of power presence.

The board can handle currents up to 3A, with a PWM duty cycle adjustment range of 0 to 100%. The frequency span is also adjustable, ranging from 500 Hz to 6.5 kHz. This makes the project suitable for a wide range of applications that require high-current PWM control.

Important Note: The board is designed to support a supply voltage up to 15V_DC. However, it can also be used with higher voltages up to 40V_DC, provided that dual power supplies are used.

To operate the board with higher voltages, two separate power supplies are required. The load supply can be connected up to 40V_DC, while the gate driver supply should be connected to a 12V to 15V DC source. To power the gate driver, use connector CN3, where Pin 2 should be connected to the 12V-15V DC supply and Pin 3 should be connected to ground (GND).

For the load power, use connector CN1, where Pin 1 should be connected to the positive terminal of the load power supply (up to 40V DC) and Pin 2 should be connected to ground (GND). By using dual power supplies and following these connection guidelines, the board can safely operate with higher voltages up to 40V_DC.

Features

Power Supply 12V to 15V DC
Duty Cycle Adjustable 0 to 100% (Adjustable Current 0 to 3A)
Frequency Adjustable 500Hz to 6.5Khz
On Board PWM LED
On Board Multiturn Trimmer for Frequency, PWM Setting
Screw Terminal for Load and Power Connections
4 x 4 mm PCB Mounting Holes
PCB Dimensions 39.37 x 34.93 mm

Connections

CN1 Load Power: Pin 1 = +12V to 15V DC, Pin 2 = GND
CN2 Load: Pin 1 = + Load, Pin 2 = -Load
CN3 Jumper: Closed Pin 1 and Pin 2 VL/VC Using Shunt for 12V to 15V Operation
For Power Up to 40V DC CN1 Pin 1 40V DC, Pin 2 = GND, CN3 Pin 2 = 12V to 15V DC and Pin 3 = GND
D2 LED: Display PWM

Schematic

Parts List

NO	QNTY.	REF.	DESC	MANUFACTURER	SUPPLIER	SUPPLIER PART NO
1	2	CN1,CN2	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1247-ND
2	1	CN3	3 PIN MALE HEADER AS JUMPER	WURTH	DIGIKEY	732-5316-ND
3	1	CN3-J	SHUNT FOR JUMPER CN3	SULLINS CONNECT	DIGIKEY	S9001-ND
4	1	C1	220uF/50V	PANASONIC	DIGIKEY	PCE4324CT-ND
5	2	C2,C3	22uF/25V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
6	3	C4,C7,C8	100nF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
7	2	C5,C6	DNP
8	1	C9	47uF/25V CERAMIC SMD SIZE 1210 OR 1206	YAGEO/MURATA	DIGIKEY
9	1	D1	MBRS360	ONSEMI	DIGIKEY	MBRS360T3OSTR-ND
10	1	D2	LED SMD SIZE 0805	OSRAM	DIGIKEY	475-1278-1-ND
11	1	D3	DNP
12	2	PR1,PR2	100K	BOURNS	DIGIKEY	3296Y-104LF-ND
13	1	Q1	LR024N DPAK	INFINEON	DIGIKEY	IRLR024NPBFCT-ND
14	2	R1,R6	2.2K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
15	3	R2,R4,R5	2E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
16	1	R3	10K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
17	1	U1	SG3525A	ST	DIGIKEY	497-6479-1-ND
18	1	U2	MCP1415T	MICROCHIP	DIGIKEY	MCP1415T-E/OTCT-ND