Summary:
Designed using the TOPSwitch-HX TOP255PN device, it features a flyback configuration that provides 12 V, 20 W output over a universal input voltage range. This design has very low no-load input power consumption and is quite energy efficient.
design feature
- Very low no-load power consumption: <100 mW (85-230 VAC)
- The average load efficiency is extremely high:
- 84.7% at 115 VAC
- 85.5% at 230 VAC
- Easily meet Energy Star 2.0 and EU CoC V3
- At 230 VAC, the standby output power is high:
- At an input power of 1.0 W, the output power is 0.75 W
- At an input power of 0.5 W, the output power is 0.35 W
- At an input power of 0.3 W, the output power is 0.2 W
- Line voltage detection
- Line voltage feedforward can effectively suppress line voltage ripple
- Intelligent voltage drop protection
- Undervoltage Lockout (UVLO) with auto-restart
- Enhanced voltage surge resistance (overvoltage shutdown, OV)
- No heat sink required
- Hysteretic thermal shutdown, overload and output short circuit protection
20 W low no-load power supply PCB physical map designed with TOP255PN
Circuit diagram of a 20 W low no-load power supply designed using TOP255PN
20 W low no-load power supply PCB layout using TOP255PN design
See the uploading documentation for details (click to download)
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