ir3832wm International Rectifier Corp., ir3832wm Datasheet - Page 15

• Manufacturer Part Number: ir3832wm
• Description: Highly Efficient Integrated Synchronous Buck Regulator For Ddr Applications Supirbuck
• Manufacturer: International Rectifier Corp.

Thermal Shutdown
Temperature
IR3832W. The trip threshold is typically set to
140
shutdown
discharges the soft start capacitor.
Automatic restart is initiated when the sensed
temperature drops within the operating range.
There is a 20
shutdown threshold.
Rev 3.0
o
C. When trip threshold is exceeded, thermal
turns
sensing
o
C hysteresis in the thermal
off
Fig.4A IR3832W Non-Tracking Operation
both
is
TIMING DIAGRAM OF PGOOD FUNCTION
Fig.8b IR3832W Tracking Operation
provided
MOSFETs
inside
and
Power Good Output
The IC continually monitors the output voltage via
Feedback (Fb pin). The Power Good signal is
flagged when the Fb pin voltage is above 0.5V
and between 85% to 115 % of Vp. This pin is
open drain and it needs to be externally pulled
high. High state indicates that output is in
regulation. Fig. 8a shows the PGood timing
diagram for non-tracking operation. In this case,
during startup, PGood goes high after the SS
voltage reaches 2.1V if the Fb voltage is within
the PGood comparator window. Fig. 8a. and Fig
8b. also show a 256 cycle delay between the Fb
voltage entering within the thresholds defined by
the PGood window and PGood going high.
IR3832WMPbF
PD-97508
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