LNK623 datasheet(2/18 Pages) POWERINT

2 / 18 page

Rev. E 09/09

LNK623-626

www.powerint.com

Pin Functional Description

DRAIN (D) Pin:

This pin is the power MOSFET drain connection. It provides

internal operating current for both start-up and steady-state

operation.

BYPASS (BP) Pin:

This pin is the connection point for an external bypass capacitor

for the internally generated 6 V supply.

FEEDBACK (FB) Pin:

During normal operation, switching of the power MOSFET is

controlled by this pin. This pin senses the AC voltage on the

bias winding. This control input regulates the output voltage

based on the ﬂyback voltage of the bias winding.

SOURCE (S) Pin:

This pin is internally connected to the output MOSFET source

for high voltage power and control circuit common returns.

Figure 2

Functional Block Diagram.

Figure 3.

Pin Conﬁguration.

PI-5197-110408

SOURCE

(S)

LEADING

EDGE

BLANKING

DRAIN

(D)

BYPASS

(BP)

FEEDBACK

(FB)

SOURCE

(S)

OUT

Reset

6 V

5 V

SAMPLE-OUT

ILIMIT

LIM

ILIMIT

6.5 V

Drive

LIM

MAX

SAMPLE-OUT

MAX

Current Limit

Comparator

STATE

MACHINE

SAMPLE

DELAY

THERMAL

SHUTDOWN

OSCILLATOR

FAULT

Auto-Restart

Open-Loop

REGULATOR

6 V

PI-5198-071608

P Package (DIP-8C)

D Package (SO-8C)

LNK623 Datasheet(PDF) 2 Page - Power Integrations, Inc.

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