4

SR036/SR037

Applications Information

Functional Block Diagram

V

REF

CM

Reg

HV

IN

Gate

Source

GND

V

OUT

Operating Principle

The SR03x operates by controlling the conduction angle of the

external MOSFET as shown in Figure 1. When the rectified AC

on. The pass transistor is turned off when the rectified AC is

when the switch is off and when the rectified AC is below the

output voltage. The amount of decay is determined by the load

and the value of C1. Since the switch only conducts with low

voltages across it, power dissipation is minimized.

Switch ON

not to scale

Figure 1: Typical Waveforms