Lamp Flasher with Timer IC and MOSFET for Automotive Applications

  • Rajkumar Sharma
  • 42 Views
  • easy
  • Tested
  • 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 15VDC.

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

NOQNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
12CN1,CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
21C122uF/25V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
31C24.7uF/16V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
41C3100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
51D1SMD LED SIZE 0805OSRAMDIGIKEY475-1278-1-ND
61PR1500K 3MM SMD TRIMMER POTBOURNSDIGIKEYTC33X-2-504ECT-ND
73Q1,R2,R5DNP
82R1,R41K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
91R310K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
101U1BD9555FVM MSOP8ROHMDIGIKEYBD9555FVM-CGCT-ND
111U2IRF7862 SOIC8INFINEONDIGIKEYIRF7862TRPBFCT-ND

Connections

Gerber View

Photos

Video


IRF7862 Datasheet

BD9555FVM Datasheet

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