Datasheet

Transformer specifications AN3172
28/31 Doc ID 17230 Rev 1
9 Transformer specifications
General description and characteristics:
● Application type: consumer, home appliances
● Transformer type: open
● Coil Former: horizontal type, 7+7 pins, two slots
● Max. temp. rise: 45 ºC
● Max. operating ambient temperature: 60 ºC
● Mains insulation: Acc. with EN60065
Electrical characteristics:
● Converter topology: half-bridge, resonant
● Core type: ETD34-PC44 or equivalent
● Min. operating frequency: 60 kHz
● Typical operating frequency: 100 kHz
● Primary inductance: 1200 µH±8 % at 1 kHz-0.25 V
(a)
●
Leakage inductance: 200 µH at 100 kHz-0.25 V
(b)
Electrical diagram and winding characteristics:
Figure 22. Transformer electrical diagram
a. Measured between pins 2-4
b. 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 mΩ 50 30xφ 0.1 mm – G1
13-12 SEC - A
(1)
1. Secondary windings A and B are in parallel
9 mΩ 5 90xφ 0.1 mm – G1
10-9 SEC – B
(1)
9 mΩ 5 90xφ 0.1 mm – G1
5-6 AUX
(2)
2. Aux winding is wound on top of primary winding
94 mΩ 4 φ 0.28 mm – G2
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