IR2172 데이터 시트보기 (PDF) - International Rectifier
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IR2172 Datasheet PDF : 6 Pages
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IR2171/IR2172
Timing Waveforms
PO
PO
Duty=93%
Duty=7%
Vin+= -260mV
Vin- = 0V
Vin+= +260mV
Vin- = 0V
Carrier Frequency =
40kHz
Figure 1 Output waveform
+260mV
Vin
-260mV
OC
twoc
tdoc
Figure 2. OC Waveform (2172 only)
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.
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