IR3721 International Rectifier, IR3721 Datasheet - Page 8

• Manufacturer Part Number: IR3721
• Description: Power Monitor IC
• Manufacturer: International Rectifier

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RESISTOR SENSING APPLICATION
The Resistor Sensing Circuit shown below is an
example of resistive current sensing. Because the
voltage on the shunt resistor is directly proportional to
the current I
not need to match the L / DCR time constant.
Page 8 of 16
VDD
Converter
L
Buck
through the inductor, R
Phase 1
Return
Power
VDD
Bypass
Cap
R
T
V
RT
CS2
I
L
L
and C
Figure 4 Resistor Sensing Circuit
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CS2
DCR
VDD
do
R
CS2
IR3721
VCS
GND
SHUNT
C
Because the value of the shunt resistance does not
change with temperature as the inductor DCR does,
R
CS2
T
can be a fixed resistor.
VO
DI
VK
VO
DATA SHEET
Power
IR3721
07/14/08