IR2172 Просмотр технического описания (PDF) - International Rectifier

Номер в каталоге

Компоненты Описание

Список матч

IR2172

LINEAR CURRENT SENSING IC

International Rectifier 

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.

4

www.irf.com

Share Link: