IR21726S International Rectifier, IR21726S Datasheet - Page 4
IR21726S
Manufacturer Part Number
IR21726S
Description
IC CURRENT SENSING LINEAR 8-SOIC
Manufacturer
International Rectifier
Datasheet
1.IR2172SPBF.pdf
(6 pages)
Specifications of IR21726S
Function
Current Sense
Voltage - Input
9.5 ~ 20 V
Current - Output
20mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Accuracy
-
Sensing Method
-
IR2171/IR2172
Application Hint:
Temperature drift of the output carrier frequency can be cancelled by measuring both a PWM period and the on-time
of PWM (Duty) at the same time. Since both periods vary in the same direction, computing the ratio between these
values at each PWM period gives consistent measurement of the current feedback over the temperature drift.
4
Timing Waveforms
+260mV
-260mV
Vin
OC
PO
PO
Figure 2. OC Waveform (2172 only)
Figure 1 Output waveform
Carrier Frequency =
Duty=93%
40kHz
t
doc
t
woc
Duty=7%
Vin+= +260mV
Vin+= -260mV
Vin- = 0V
Vin- = 0V
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