IR2171STR International Rectifier, IR2171STR Datasheet - Page 4

• Manufacturer Part Number: IR2171STR
• Description: IC CURRENT SENSE 8SOIC
• Manufacturer: International Rectifier

Specifications of IR2171STR

• Function: Current Sense
• Voltage - Input: 9.5 ~ 20 V
• Current - Output: 1mA
• 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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