FAN302HLMY_F117 Datasheet, PDF (16/18 Pages) Fairchild Semiconductor – PWM Controller for Low Standby Power Battery-Charger Applications — mWSaver™ Technology

Typical Application Circuit (Continued)
Transformer Specification
 Core: EI12.5
 Bobbin: EI12.5
2
1
Secondary Winding
Auxiliary Winding
FLY–
FLY+
5
Primary Winding
4
BOBBIN
Figure 42.Transformer
Notes:
7. W1 consists of four layers with different number of turns. The number of turns of each layer is specified in Table
1. Add one insulation tape between the second and third layers.
8. W2 consists of two layers with triple-insulated wire. The leads of positive and negative fly lines are 3.5cm and
2.5cm, respectively.
9. W3 is space winding in one layer.
Table 1. Transformer Winding Specifications
Terminal
NO.
Start Pin
End Pin
Wire
W1
4
5
2UEW 0.1*1
W2
Fly+
Fly-
W3
1
2
W4
2
Note:
10. W4 is the outermost and space winding.
TEX-E 0.45*1
2UEW 0.18*1
Core Rounding Tape
Core
2UEW 0.18*1
Turns
26
25
24
18
7
11
5
Insulation
Turns
0
1
0
2
2
2
3
0
2
Primary-Side Inductance
Primary-Side Leakage Inductance
Pin
4－5
4－5
Specifications
700μH ±7%
130μH ±7%
Remark
100kHz, 1V
Short One of the Secondary-Side Windings
© 2012 Fairchild Semiconductor Corporation
FAN302HLMY_F117 • Rev. 1.0.1
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