Advanced Power

Electronics Corp.

APE1702

BLOCK DIAGRAM

FUNCTION DESCRIPTION

PIN FUNCTION

VCC

VSS

SW

FEEDBACK

5

This is positive input supply for the IC switching regulator. A suitable input bypass

capacitor must be presented at this pin to minimize voltage transients and to supply

the switching currents needed by the regulator.

Circuit ground.

Internal Switch. The voltage at this pin switches between (+VCC - VSAT) and

approximately - 0.5V, with a duty cycle of approximately VOUT / VCC. To minimize

coupling to sensitive circuitry, the PC board copper area connected to this pin should

be minimized.

Senses in the regulated output voltage to complete the feedback loop.