TOP245P datasheet(14/25 Pages) POWERINT

14 / 25 page

DER-19

TOP245P Multiple Output Set Top Box

March 30, 2004

Page 14 of 25

Power Integrations, Inc.

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

cm^2

0.60

Core Effective Cross

Section Area

ALG

nH/T^2

234

Gapped Core Effective

Inductance

mTesla

207

Maximum Operating

Flux Density

mTesla

267

Peak Flux Density

BAC

mTesla

AC Flux Density for

Core Curves

0.28

Gap Length

uHenries

17.7

Estimated Transformer

Primary Leakage

Inductance

LSEC

nHenries

Estimated Secondary

Trace Inductance

Secondary

Parameters

NSx

2.00

2.89

6.68

10.89 Secondary Number of

Turns

Rounded Down NSx

10 Rounded to Integer

Secondary Number of

Turns

Rounded

Down Vox

Volts

3.27

10.62

18.17 Auxiliary Output Voltage

for Rounded to Integer

NSx

Rounded Up NSx

11 Rounded to Next

Integer Secondary

Number of Turns

Rounded Up

Vox

Volts

5.16

12.51

20.05 Auxiliary Output Voltage

for Rounded to Next

Integer NSx

ODS Actual

Range

0.64 -

1.03

0.51 -

0.81

0.25 -

0.40

0.20 -

0.32

Secondary Actual Wire

Diameter Range

Comment: Wire

diameter is greater than

recommended

maximum (0.40 mm)

and may overheat.

Tip: Consider a parallel

winding technique

(bifilar, trifilar), increase

size of transformer

(larger BW), reduce

margin (M).

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