DC-DC CONVERTER
Isolated Flyback DC-DC Converter
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CASE ANALYSIS
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.
Key decisions
- Transformer provides galvanic isolation and voltage step‑down
- RCD snubber (D2, C2, R2) limits voltage spikes across the MOSFET
- Schottky diode D1 reduces forward‑voltage drop and switching losses
When to reuse this
Suitable for isolated offline power supplies, USB chargers, and auxiliary power converters where safety isolation and compact size are required.
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circuit-isolated-flyback-converter-with-tny268-for-5v-2a