AN2331 datasheet(21/24 Pages) STMICROELECTRONICS

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AN2331

Resonant trafo specification

21/24

Resonant trafo specification

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Application type: Consumer, Home Appliance

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Transformer type: Open

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Coil former: Horizontal type, 7+7 pins, 2 Slots

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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 EN60065 specifications

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Finishing: Varnished

7.1

Resonant trafo electrical characteristics

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Converter topology: half-bridge, resonant

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Core type: EF32 - PC40 or equivalent

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Typical operating frequency: 100 kHz

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Primary inductance: 810

µH ±10% @1kHz - 0.25V (see Note 1)

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Leakage inductance: 200

µH ±10% @1kHz - 0.25V (see Note 1 and Note 2)

Note:

Measured between pins 1-4.

Measured between pins 1-4 with a secondary winding shorted.

Figure 14.

Electrical diagram and winding characteristics

Table 7.

Winding characteristics

Pins

Winding

RMS current

Number of turns

Wire type

2 - 4

PRIMARY

1 ARMS

φ0.40mm-TIW

14 - 13

SEC. A (1)

Secondary windings A and B must be wound in parallel

4 ARMS

φ0.1x60 - G2

12 - 11

SEC. B (2)

Auxiliary winding is wound on top of primary winding

4 ARMS

φ0.1x60 - G2

5-6

AUX (2)

0.05 ARMS

4 SPACED

φ0.40mm-TIW

SEC. A

SEC. B

PRIM.

AUX.

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