Lamp Flasher with Timer IC and MOSFET for Automotive Applications

Rajkumar Sharma
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SKU: EL148421
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This is a mini flasher board that can drive high-power LED or a lamp, mainly designed for automotive applications. The project consists BD9555FVM-C timer chip and MOSFET. The circuit is configured as a flasher, and can also be used as a PWM driver with an adjustable duty cycle and frequency. Capacitors C2, R4, and PR1 can be used to set the duty cycle. Please refer to the datasheet of BD9555FVM for more information. N-channel IRF7862 MOSFET used to drive the load, and it’s advisable to use maximum load current 3A due to small thermal dissipation on PCB for the MOSFET. The operating power supply is 5V to 15V_DC.

Features

Power Supply 5V to 15V DC
Load Up to 3A
Flash Frequency 2Hz to 10 Hz
PWM Frequency range 1Hz to 10Khz (PR1, R4 and C2)
Adjustable Duty Cycle 1% to 99% (PR1, R4 and C2)
PCB Dimensions 22.07 x 10.95 mm

Connections

CN1: Pin 1 = +DC 5V to 15V, Pin 2 = GND
CN2: Pin 1 = +DC, Pin 2 = Load
PR1: Frequency Adjust
D1: Power LED

Schematic

Parts List

NO	QNTY.	REF.	DESC.	MANUFACTURER	SUPPLIER	SUPPLIER PART NO
1	2	CN1,CN2	2 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
2	1	C1	22uF/25V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
3	1	C2	4.7uF/16V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
4	1	C3	100nF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
5	1	D1	SMD LED SIZE 0805	OSRAM	DIGIKEY	475-1278-1-ND
6	1	PR1	500K 3MM SMD TRIMMER POT	BOURNS	DIGIKEY	TC33X-2-504ECT-ND
7	3	Q1,R2,R5	DNP
8	2	R1,R4	1K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
9	1	R3	10K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
10	1	U1	BD9555FVM MSOP8	ROHM	DIGIKEY	BD9555FVM-CGCT-ND
11	1	U2	IRF7862 SOIC8	INFINEON	DIGIKEY	IRF7862TRPBFCT-ND