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__IRDCiP2003A-C
Adjusting the Over-Current Limit
R5, R7, R8, and R9 are the resistors used to adjust the over-current trip point. The trip point is a function of the controller and
corresponds to the per phase output current indicated on the x-axis of Fig. 11. For example, selecting 3.65k resistors will set the
trip point of each phase to 66A. (Note: Fig. 11 is based on iP2003A, TJ = 125 ° C. The trip point will be higher than expected if the
reference board is cool and is being used for short circuit testing.)
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
43
45
47
49
51
53
55
57
59
61
63
65
67
Over-Current Trip Point (per Phase)
Fig. 11: R ISEN vs. Current (per Phase)
100
10
100
Output Frequency (kHz) (per Phase)
Fig. 12: R4 vs. Frequency (per Phase)
1000
5
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