IRDCIP2002-C Datasheet, PDF (4/7 Pages) International Rectifier – 1MHz, 120A, 4-phase Synchronous Buck Converter using iP2002

IRDCiP2002-C
Adjusting the Over-Current Limit
R5, R7, R8 & 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. 10. For example, selecting 2.7k resistors will
set the trip point of each phase to 49.5A. (Note: Fig. 10 is based on iP2002 T_BLK = 125°C. The trip point will be higher than
expected if the reference board is cool and is being used for short circuit testing.)
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
32
34
36
38
40
42
44
46
48
50
Over-Current Trip Point (per Phase)
Fig. 10: R_ISEN vs. Current (per Phase)
100
90
80
70
60
50
40
30
20
10
300
400
500
600
700
800
900
1000
Output Frequency (kHz) (per Phase)
Fig. 11: R4 vs. Frequency (per Phase)
4
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