FAN302UL Fairchild Semiconductor, FAN302UL Datasheet - Page 17

• Manufacturer Part Number: FAN302UL
• Description: This highly integrated PWM controller provides several features to enhance the performance of flyback converters
• Manufacturer: Fairchild Semiconductor

© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.2
Typical Application Circuit
Transformer Specification
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Table 1.
Primary-Side Inductance
Primary-Side Effective Leakage Inductance
No.
W1
W2
W3
Core: EI12.5
Bobbin: EI12.5
W1 is space winding in one layer.
W2 consists of three layers with different numbers of turns. The number of turns of each layer is specified in
Table 1.
W3 consists of two layers with triple-insulated wire. The leads of positive and negative fly lines are 3.5cm and
2.5cm, respectively.
Transformer Winding Specifications
Start Pin
Fly+
1
4
Terminal
End Pin
Fly-
(Continued)
2
5
Figure 44.Transformer
4－5
4－5
Pin
Specifications
17
2UEW 0.15*2
2UEW 0.12*1
TEX-E 0.4*1
530H ±7%
52H ±5%
Wire
100kHz, 1V
Short One of the Secondary Windings
Turns
22
22
22
8
5
Remark
Insulation
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Turns
2
0
1
3
3