Summary:
Way of working
This wide voltage input flyback power supply uses many of the built-in features of TOPSwitch-GX to reduce component count, transformer size and overall cost. The design revolves around a TOP245P (DIP-8 package) that uses PCB copper foil to dissipate heat, eliminating heat sinks and installation costs. The output rectifier D7 also dissipates heat in the same way.
design feature
- No external heat sink required
- Efficiency is 77% (minimum) at 85 VAC input / 35 W output
- Low no-load power consumption, <0.7 W at 230 VAC
- A small number of components: a total of 37 components, excluding I / O connectors
- Stable operation with or without 10,000 μF output snubber capacitors
- Stable and powerful transformer design capable of outputting 35 W peak power
- Meets CISPR22B EMI requirements with >10 dB margin
- Ideal for class AB and class D audio amplifiers with 6-channel Dolby Digital 6 ohm speakers
Audio amplifier power circuit diagram
See the PDF document for details (click on the PDF file to download)
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