DER-113 datasheet(13/25 Pages) POWERINT

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DER-113

5 W Charger for Portable Audio Player

July 19, 2006

Page 13 of 25

Power Integrations

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

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TRANSFORMER PRIMARY DESIGN PARAMETERS

2519 uHenries

Typical Primary Inductance. +/- 12% to ensure a

minimum primary inductance of 2249 uH

LP_TOLERANCE

12 %

Primary inductance tolerance

120

Primary Winding Number of Turns

ALG

174 nH/T^2

Gapped Core Effective Inductance

2909 Gauss

Maximum Operating Flux Density, BM<3000 is recommended

BAC

952 Gauss

AC Flux Density for Core Loss Curves (0.5 X Peak to Peak)

1654

Relative Permeability of Ungapped Core

0.12 mm

Gap Length (Lg > 0.1 mm)

BWE

25.8 mm

Effective Bobbin Width

0.21 mm

Maximum Primary Wire Diameter including insulation

INS

0.04 mm

Estimated Total Insulation Thickness (= 2 * film thickness)

DIA

0.17 mm

Bare conductor diameter

AWG

34 AWG

Primary Wire Gauge (Rounded to next smaller standard

AWG value)

40 Cmils

Bare conductor effective area in circular mils

CMA

273 Cmils/Amp

Primary Winding Current Capacity (200 < CMA < 500)

TRANSFORMER SECONDARY DESIGN PARAMETERS

Lumped

parameters

ISP

4.68 Amps

Peak Secondary Current

ISRMS

2.29 Amps

Secondary RMS Current

IRIPPLE

2.06 Amps

Output Capacitor RMS Ripple Current

CMS

458 Cmils

Secondary Bare Conductor minimum circular mils

AWGS

23 AWG

Secondary Wire Gauge (Rounded up to next larger standard

AWG value)

VOLTAGE STRESS PARAMETERS

VDRAIN

640 Volts

Maximum Drain Voltage Estimate (Assumes 20% zener

clamp tolerance and an additional 10% temperature

tolerance)

PIVS

24 Volts

Output Rectifier Maximum Peak Inverse Voltage

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