STR-W6753
Quasi-Resonant Topology
Primary Switching Regulators
Figure 3 – MOSFET Avalanche Energy Derating Curve
VDD = 99 V, L = 20 mH, IL = 3.6 A
100
80
60
40
20
0
25
50
75
100
125
150
Channel Junction Temperature, TJ (°C)
Figure 4 – Transient Thermal Resistance
10.000
1.000
0.100
0.010
0.001
1μ
10μ
100μ
1m
10m 100m
Time, t (s)
Figure 5 – MOSFET Power Dissipation versus Temperature
30
25
With infinite heatsink
PD1 = 26 W at TA ≤ 25°C
20
15
10
5
Without heatsink
PD1 = 1.3 W at TA ≤ 25°C
0
0 20 40 60 80 100 120 140 160
Ambient Temperature, TA (°C)
28103.31
4
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