Flyback transformer (PQ26, PQ2625)
Gapped ferrite PQ26/25 flyback transformer · Np 40 : Ns 8 : Na 22 · Lp 450 µH · leakage 4 µH · saturates near 3.4 A · secondary in triple-insulated wire, 3 kV primary to secondary
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Pins
- P1 primary start (bulk +)
- P2 primary end (drain)
- S1 secondary (to the diode)
- S2 secondary return
- A1 aux winding
- A2 aux return
Lessons and builds that use it
- 65 W USB-C PD charger from scratch: mains flyback (UC3844, 800 V MOSFET, PQ2625 transformer), TL431 + PC817 feedback, PD controller (build)
- Real device: phone charger, 220 V AC wall to 5 V USB (build)
- Real device: laptop charger, 220 V AC wall to 20 V with PFC (build)