AN2852 datasheet(31/35 Pages) STMICROELECTRONICS

Part #	AN2852

Description	This document describes the characteristics and performance of a 90 W wide range input

PDF	35 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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AN2852

AHB transformer specifications

31/35

AHB transformer specifications

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Application type: consumer, IT

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Transformer type: open

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Coil former: horizontal type, 7+7 pins

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Max. temp. rise: 45°C

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Max. operating ambient temp.: 60°C

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Mains insulation: compliance with EN60950.

8.1

Electrical characteristics

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Converter topology: asymmetrical half-bridge

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Core type: ETD34 - N87 or equivalent

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Operating frequency: 100 kHz

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Primary inductance: 400 µH 10% at 1 kHz - 0.25 V (see Note 1)

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Air gap: 2.32 mm on central leg

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Leakage inductance: 10 µH max. at 100 kHz - 0.25 V (see Note 2)

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Primary capacitance: 6 pF typ. (see Note 3)

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Max. peak primary current: 1.93 Apk

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RMS primary current: 0.75 ARMS

Note:

measured between pins 2-4

measured between pins 2-4 with secondaries and auxiliary windings shorted

calculated considering primary inductance and resonance frequency

Figure 30.

Electrical diagram

AM01845v1

PRIM.

AUX

SEC.

AN2852 Datasheet(PDF) 31 Page - STMicroelectronics

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