12 W isolated flyback power supply for appliances using TinySwitch-5 (TNY5071K)

• Output: 12 V, 1 A
• Input: 85 - 265 VAC
• Most cost-effective BOM possible for a 12 W flyback
• Simple feedback to meet +/-5% voltage regulation with Zener diode, no TL431 needed
• <150 kHz switching frequency for small EE16 transformer
• >87% average efficiency at 115 VAC and 230 VAC
• >70% efficient at 230 VAC and 300 mW input
• >210 mW available power in standby, under the 300 mW ErP limit