ISL6740 Datasheet, PDF (17/29 Pages) Intersil Corporation – Flexible Double Ended Voltage and Current Mode PWM Controllers

ISL6740, 1SL6741
The order and geometry of the windings affects the AC
resistance, winding capacitance, and leakage inductance of
the finished transformer. To mitigate these effects,
interleaving the windings is necessary. The primary winding
is sandwiched between the two secondary windings. The
winding layout appears below.
FIGURE 7D. INT. LAYER 3: 2 TURNS PRIMARY WINDING
FIGURE 7A. TOP LAYER: 1 TURN SECONDARY AND SR
WINDINGS
FIGURE 7E. INT. LAYER 4: 1 TURN SECONDARY WINDING
FIGURE 7B. INT. LAYER 1: 1 TURN SECONDARY WINDING
FIGURE 7C. INT. LAYER 2: 2 TURNS PRIMARY WINDING
17
FIGURE 7F. BOTTOM LAYER: 1 TURN SECONDARY AND SR
WINDINGS
∅0.358
∅0.689
0.807
0.639
0.403
0.169
0.000
0.000 0.184
0.479
0.774 1.054
FIGURE 7G. PWB DIMENSIONS
FN9111.4
July 13, 2007