SR037SG(2002) Ver la hoja de datos (PDF) - Supertex Inc

Número de pieza

componentes Descripción

Fabricante

SR037SG
(Rev.:2002)

Inductorless, Dual Output Off-Line Regulators

Supertex Inc 

Applications Information

Operating Principle

The SR03x operates by controlling the conduction angle of the

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

voltage is below the VTH threshold, the pass transistor is turned

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

above HVIN(off). Output voltage (Vunreg) decays during the periods

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.

SR036/SR037

Functional Block Diagram

HVIN Gate Source

VREF

CM

Reg

VOUT

GND

Switch ON

HVIN

VTH

VREG

VUNREG

Figure 1: Typical Waveforms

not to scale

4

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