TOP245P datasheet(16/35 Pages) POWERINT

16 / 35 page

DER-18

DVD Recorder Supply – TOP245P

March 30, 2004

Page 16 of 35

Power Integrations

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

www.powerint.com

ENTER TRANSFORMER

CORE/CONSTRUCTION

VARIABLES

Core Type

EER2

Core

EER28

P/N:

PC40EER28L-Z

Bobbin

EER28

L_BOB

BIN

P/N:

BEER-28L-1112CPH

0.814 cm^2

Core Effective Cross Sectional Area

7.55 cm

Core Effective Path Length

2520 nH/T^2 Ungapped Core Effective Inductance

21.5

21.5 mm

Bobbin Physical Winding Width

Safety Margin Width (Half the Primary

to Secondary Creepage Distance)

2.1

Number of Primary Layers

Number of Secondary Turns

DC INPUT VOLTAGE

PARAMETERS

VMIN

75 Volts

Minimum DC Input Voltage

VMAX

396 Volts

Maximum DC Input Voltage

CURRENT WAVEFORM SHAPE

PARAMETERS

DMAX

0.61

Maximum Duty Cycle

IAVG

0.45 Amps

Average Primary Current

0.97 Amps

Peak Primary Current

0.48 Amps

Primary Ripple Current

IRMS

0.58 Amps

Primary RMS Current

TRANSFORMER PRIMARY

DESIGN PARAMETERS

717 uHenri

Primary Inductance

Primary Winding Number of Turns

Bias Winding Number of Turns

ALG

227 nH/T^2 Gapped Core Effective Inductance

1518 Gauss Maximum Flux Density at PO, VMIN

(BM<3000)

1846 Gauss Peak Flux Density (BP<4200)

BAC

380 Gauss AC Flux Density for Core Loss Curves

(0.5 X Peak to Peak)

1860

Relative Permeability of Ungapped

Core

0.41 mm

Gap Length (Lg > 0.1 mm)

BWE

19.95 mm

Effective Bobbin Width

0.36 mm

Maximum Primary Wire Diameter

including insulation

INS

0.06 mm

Estimated Total Insulation Thickness (=

2 * film thickness)

DIA

0.30 mm

Bare conductor diameter

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