Coilcraft GA3172 Flyback Transformer for the Microchip PFC LED Driver
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Flyback Transformer for
Microchip AC LED driver

  • Developed for Microchip to operate with PIC16HV785 CMOS Microcontroller and MCP1402 Gate Driver
  • Universal ac input; 20 V, 0.7 A output
  • 3000 Vrms, one minute isolation from the primary and bias to the secondary winding
  • 12 V bias winding output powers the microcontroller
  • RoHS-compliant. Tin-silver over tin over copper over steel terminations


Part number
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at 0A1
±10% (µH)
at Ipk2
±5% (µH)
DCR max3
max (µH)
Turns ratio Ipk2
pri : sec pri : bias
GA3172-AL 500 450 0.675 (pri)
0.245 (sec)
0.325 (bias)
8.25 1 : 0.214 1 : 0.131 0.78 20 V, 0.7 A
1 Inductance is for the primary, measured at 250 kHz, 1.0 Vrms.
2 Ipk: Peak primary current drawn at minimum input voltage.
3 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary winding with the secondary windings shorted.
5 Output is for the secondary. Bias winding output is 12 V.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component: −40°C to +85°C
Packaging trays: −40°C to +80°C
8 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: April 16, 2018