AN3172 datasheet(28/31 Pages) STMICROELECTRONICS

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Transformer specifications

AN3172

28/31

Doc ID 17230 Rev 1

Transformer specifications

General description and characteristics:

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Application type: consumer, home appliances

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Transformer type: open

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Coil Former: horizontal type, 7+7 pins, two slots

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Max. temp. rise: 45 ºC

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Max. operating ambient temperature: 60 ºC

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Mains insulation: Acc. with EN60065

Electrical characteristics:

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Converter topology: half-bridge, resonant

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Core type: ETD34-PC44 or equivalent

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Min. operating frequency: 60 kHz

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Typical operating frequency: 100 kHz

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Primary inductance: 1200 µH±8 % at 1 kHz-0.25 V (a)

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Leakage inductance: 200 µH at 100 kHz-0.25 V (b)

Electrical diagram and winding characteristics:

Figure 22.

Transformer electrical diagram

Measured between pins 2-4

Measured between pins 2-4 with only one secondary winding shorted

Table 6.

Transformer winding data

Pins

Winding

DC resistance

Number of turns

Wire type

2-4

Primary

235 m

Ω

30x

φ 0.1 mm – G1

13-12

SEC - A(1)

Secondary windings A and B are in parallel

9 m

Ω

90x

φ 0.1 mm – G1

10-9

SEC – B (1)

9 m

Ω

90x

φ 0.1 mm – G1

5-6

AUX (2)

Aux winding is wound on top of primary winding

94 m

Ω

φ 0.28 mm – G2

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