The scenario
Design an isolated flyback DC‑DC converter using a TNY268 controller to step down high‑voltage DC (e.g., 170 V) to a regulated 5 V output at 2 A. The schematic includes a transformer for isolation, a MOSFET switch, output rectification, and a primary‑side snubber for clamping.
What is in this drawing
Read the decisions behind it.
01
Transformer provides galvanic isolation and voltage step‑down
02
RCD snubber (D2, C2, R2) limits voltage spikes across the MOSFET
03
Schottky diode D1 reduces forward‑voltage drop and switching losses
Suitable for isolated offline power supplies, USB chargers, and auxiliary power converters where safety isolation and compact size are required.
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