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IR3521 Datasheet(PDF) 31 Page - International Rectifier

Part # IR3521
Description  XPHASE3TM AMD SVID CONTROL IC
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3521 Datasheet(HTML) 31 Page - International Rectifier

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IR3521
Page 31
V3.03
IDD Dynamic OC Limit Capacitor
The latest AMD processors require two over current limits: one for normal thermal design current (TDC) operation and
the other for system IDD_Spike. TDC over-current is set by following instructions outlined in the Over Current Setting
Resistor Rocset section. IDD_Spike occur when the load current exceeds the TDC for a very short duration (10 ms).
Figure 18 shows the boundaries of an event. The current over a moving average of 10 ms does not exceed the TDC
limit. Higher IDD-Spike will last for a shorter duration.
Figure 18 Showing IDD_Spike Boundaries
The IDD_Spike over current threshold can be implemented by incorporation a properly sized capacitor between
the OCSET (18) and the IN1 (21) pins (see Figure 19).
Figure 19 CIDDSpike and ROCSET form a High Pass Filter
12
3
4
5
6
78
9
10
Time (ms)
IDDSpike
TDC
OCP-TDC
OCP-IDDSpike
Phase IC
1
Phase IC
2
Phase IC
3
Phase IC
4
IOUT
IOUT
IOUT
IOUT
IIN
VDAC
OCSET1
RVDAC
CVDAC
Control IC
OCSET
comparator
ROCSET
CIDDSpike
High-pass filter



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