LNK603-606/613-616
LinkSwitch-II
FB
BP
S
S
V OUT
V IN +
+
6.2 V
10 μ F
D
S
S
500 ?
+
2V
PI-4961-022708
1) Raise V BP voltage from 0 V to 6.2 V, down to 4.5 V, up to 6.2 V
2) Raise V IN until cycle skipping occurs at V OUT to measure V FBth
3) Reduce V IN until cycle skipping stops at V OUT to measure V FBth- . Cable drop compensaion factor is υ FB = V FBth / V FBth-
4) Apply 1.5 V at V IN and measure t FB delay from start of cycle falling edge to the next falling edge
Figure 19. Test Set-up for Feedback Pin Measurements.
LinkSwitch-II
FB
S
5 μ F
50 k ?
10 k ?
1 μ F
.1 μ F
BP
S
S
D
S
V IN
+
4 k ?
S1
S2
16 V
Curve
Tracer
To measure BV DSS , I DSS1 , and I DSS2 follow these steps:
1) Close S1, open S2
2) Power-up V IN 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
www.powerint.com
Rev. F 01/10
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