AN3089 datasheet(21/25 Pages) STMICROELECTRONICS

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AN3089

Transformer specification

General description and characteristics



Application type: consumer, home appliance



Transformer type: open



Coil former: horizontal type, 6 + 6 pins



Max. temp. rise: 45 ºC



Max. operating ambient temperature: 60 ºC



Mains insulation: acc. with EN60950

Electrical characteristics



Converter topology: QR flyback



Core type: EER28L-PC44 or equivalent



Typical operating frequency: 100 kHz



Primary inductance: 500 µH ± 10% at 1 kHz - 0.25 V(a)



Leakage inductance: 5 µH max. at 100 kHz - 0.25 V(b)

Figure 20. Transformer

“”

a. Measured between pins 2 - 1.

b. Measured between pins 2 - 1 with secondary windings shorted.

Table 4. Transformer winding data

Pins

Winding

RMS current

Number of

turns

Wire type

3 - 1

PRIMARY A(1)

1. Secondary windings are wound between primary A and primary B layers.

0.84 ARMS

 30 x 0.1 mm

9 - 7

SEC - A(2)

2. Secondary windings A and B are in parallel.

2.9 ARMS

7G1

 90 x 0.1 mm

10 - 8

SEC - B (2)

2.9 ARMS

7G1

 90 x 0.1 mm

2 - 3

PRIMARY B(1)

0.84 ARMS

 30 x 0.1 mm

6 - 5

AUX

0.05 ARMS

6 spaced

 0.25 mm

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