1.75W isolated flyback power supply designed with LNK564DN

1206 red anti-stick

MOS power IC full range

Summary:

The isolated flyback power supply is designed around the LNK564DN (U1) of the LinkSwitch-LP product line. Outputs up to 5V/350mA (1.75W) over a universal input voltage range of 90-265VAC.

design feature

• A small PCB board (1.12 × 0.89 inches) can be used in the SO-8 package
• High switching frequency (100 kHz) for small, lightweight transformers (EE-13)
• Small component count: only 16 components
• Output power level and MOSFET current limit point keep MOSFET drain node clamp-free (Clampless?)
• Half-wave rectification allows input conduction EMI filter inductors to be used as Filterfuse?
• Meet CEC/Energy Star requirements for operational status efficiency (64% vs 54% minimum)
• No-load input power consumption <100 mW at 230 VAC
• Meets CISPR-22/EN55022 B conducted EMI limits and does not use Y capacitors
• Constant voltage constant current (CV/CC) output characteristics are ideal for replacing 50/60 Hz linear transformer chargers

5V, 350mA (1.75W) flyback power supply circuit diagram based on LNK564DN

See the uploading documentation for details (click to download)