TOP243 View Datasheet(PDF) - Power Integrations, Inc

Part Name

Description

Manufacturer

TOP243

Extended power, design elexible, integrated off-line switcher

Power Integrations, Inc 

TOP242-250

Solder Side

Component Side

+

TOP VIEW

Safety Spacing

Y1-

Capacitor

Output Filter Capacitors

HV

-

R1a - 1c

Input Filter

Capacitor

D

S

X

L

C

TOPSwitch-GX

Figure 49. Layout Considerations for TOPSwitch-GX using R Package.

T

PRI

r

a

n

PRI

s

f

SEC

o

r

m

BIAS e

r

Opto-

coupler

- DC +

Out

Maximize hatched copper

areas(

) for optimum

heat sinking

PI-2734-043001

the part-to-part variation of the RDS(ON) of TOPSwitch-GX

as specified in the data sheet. The margin required can

either be calculated from the tolerances or it can be

accounted for by connecting an external resistance in

series with the DRAIN pin and attached to the same

heatsink, having a resistance value that is equal to the

difference between the measured RDS(ON) of the device

under test and the worst case maximum specification.

Design Tools

For a discussion on utilizing TOPSwitch-GX in a forward

converter configuration, please refer to the TOPSwitch-GX

Forward Design Methodology Application Note.

Up-to-date information on design tools can be found at the

Power Integrations Web site: www.powerint.com

33 H

9/02

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