This reference design report introduces a 7.5W continuous, 13W peak DVD/set-top box reference design using TNY376PN.
The document is an engineering reference describing a four‑output flyback power supply built around the TNY376PN TinySwitch‑PK IC. It includes specifications, schematics, PCB layout, bill of materials, transformer design, performance data and EMI compliance information.
Key features include cross‑regulation without a post‑regulator, EcoSmart™ energy‑star compliance, <150 mW no‑load consumption at 265 VAC, >70 % active‑mode efficiency, and integrated safety functions such as hysteretic thermal shutdown and auto‑restart. The report also provides design spreadsheets and measured waveforms for verification.
| Input Voltage | 85‑265 VAC |
|---|---|
| No‑load Input Power (230 VAC) | 0.3 W |
| Output 1 Ripple | 100 mV (20 MHz BW) |
| Output 1 Current | 0.1‑0.6 A |
| Output 2 Ripple | 66 mV (20 MHz BW) |
| Output 3 Ripple | 240 mV (20 MHz BW) |
| Safety Features | Thermal shutdown, auto‑restart, >3.2 mm creepage |
The design consumes less than 150 mW at 265 VAC when there is no load.
It includes a ±5 % accurate hysteretic thermal shutdown, auto‑restart after fault, and >3.2 mm creepage for high‑humidity environments.
Yes, it meets EN550022 and CISPR‑22 Class B conducted EMI requirements with more than 20 dBuV margin.