IR2172SPBF International Rectifier, IR2172SPBF Datasheet - Page 4

• Manufacturer Part Number: IR2172SPBF
• Description: IC CURRENT SENSE 8SOIC
• Manufacturer: International Rectifier

Specifications of IR2172SPBF

• 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)
• Quiescent Current: 1mA
• Bandwidth: 15kHz
• Sensor Case Style: SOIC
• No. Of Pins: 8
• Supply Voltage Range: 9.5V To 20V
• Operating Temperature Range: -40°C To +125°C
• Device Type: High Side
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Accuracy: -
• Sensing Method: -
• Lead Free Status / Rohs Status: Compliant
• Other names: *IR2172SPBF

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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