LNK603-606/613-616
LinkSwitch-II
FB
BP
S
S
VOUT
10 µF
S
S
+
+
VIN
D
6.2 V
500 Ω
+
2 V
PI-4961-022708
1) Raise VBP voltage from 0 V to 6.2 V, down to 4.5 V, up to 6.2 V
2) Raise VIN until cycle skipping occurs at VOUT to measure VFBth
3) Reduce VIN until cycle skipping stops at VOUT to measure VFBth-. Cable drop compensaion factor is υFB = VFBth / VFBth-
4) Apply 1.5 V at VIN and measure tFB delay from start of cycle falling edge to the next falling edge
Figure 19. Test Set-up for Feedback Pin Measurements.
LinkSwitch-II
FB
BP
S
S
1 µF
5 µF
50 kΩ
10 kΩ
4 kΩ
.1 µF
S
S
D
S1
S2
VIN
+
16 V
Curve
Tracer
To measure BVDSS, IDSS1, and IDSS2 follow these steps:
1) Close S1, open S2
2) Power-up VIN source (16 V)
3) Open S1, close S2
4) Measure I/V characteristics of Drain pin using the curve tracer
PI-4962-040308
Figure 20. Test Set-up for Leakage and Breakdown Tests.
13
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Rev. F 01/10
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