Product Name: SD6620

Function description: Primary control switch power supply with external high-voltage MOS transistor

Product Overview: SD6620 is a switch mode power supply controller (PSR) that drives high voltage MOS transistors in primary control mode. It has built-in high and low voltage peak current compensation function and adopts PFM modulation technology to provide accurate constant current control loop, with very high stability and average efficiency.

The SD6620 system design eliminates the need for optocouplers and Y capacitors, eliminating the need for secondary feedback control and loop compensation, streamlining circuits, and reducing costs.

SD6620 can set the output current through peak current sampling resistor within the applicable output power range to meet the needs of different output powers.

Main features: primary control mode/low starting current leading edge blanking/cycle by cycle current limiting/PFM modulation/peak reduction mode/overvoltage protection/undervoltage locking/loop open circuit protection/maximum conduction time protection/over temperature protection/peak current compensation

Block diagram: