Data Sheet

© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR2100 • Rev.1.1.0 14
FSFR2100 — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters
Typical Application Circuit (Continued)
Usually, LLC resonant converters require large leakage inductance value. To obtain a large leakage inductance,
sectional winding method is used.
 Core: EC35 (Ae=106 mm2)
 Bobbin: EC35 (Horizontal)
 Transformer Model Number: SNX-2468-1
Figure 30. Transformer Construction
Pin (S → F) Wire Turns Note
N
p
6 → 2 0.08φ×88 (Litz Wire) 36
N
s1
12 → 9 0.08φ×234 (Litz Wire) 4 Bifilar Winding
N
s2
10 → 13 0.08φ×234 (Litz Wire) 4 Bifilar Winding
Pins Specifications Remark
Primary-Side Inductance (L
p
) 2 6
550 H ± 10%
100 kHz, 1 V
Primary-Side Effective Leakage (L
r
) 2 6
110 H ± 10%
Short one of the Secondary Windings
For more detailed information regarding the transformer, visit http://www.santronics-usa.com/documents.html or contact
[e-mail]
or [phone] (Sunnyvale, California USA).