Circuit design of ultra-wide range input (57-580 VAC) flyback power supply

NFM60R30T222T1M00-57

MOS power IC full range

1206 red anti-stick

ESD TVS electrostatic protection tube 0201 package 3.3V ultra low capacitance ESD

Summary:

Way of working

The AC input is rectified and filtered and combined into a DC applied to one end of the primary winding of the transformer. A 450 V capacitor is added to the shunt balance resistor to achieve the required voltage rating. The resistors R1 to R4 provide an insurance function in the event of a sudden failure. The L1, C1 and transformer E-Shield windings allow the design to meet the EN55022 B conduction limit and have a good margin.

design feature

• StackFETTM Flyback Topology outputs full power over an extremely wide input range
• E-ShieldTM transformer construction reduces common mode EMI (>10 dBμV margin)
• 66 kHz switching frequency and frequency jitter reduces conducted EMI
• Simple ON/OFF controller - no feedback compensation required
• Automatic restart function: self-recovery open loop, overload and short circuit protection
• Built-in 135 oC hysteretic thermal shutdown

See the PDF document for details (click on the PDF file to download)