IR2172(2000) 데이터 시트보기 (PDF) - International Rectifier

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IR2172
(Rev.:2000)

LINEAR CURRENT SENSING IC

International Rectifier 

IR2172

ADVANCE INFORMATION

AC Electrical Characteristics cont.

VCC = VBS = 15V, unless otherwise specified.

Symbol

Definition

Proagation delay characteristics

tdoc

Propagation delay time of OC

twoc

Low true pulse width of OC

Min. Typ. Max. Units Test Conditions

1

1.5 — µsec

—

1

—

Timing Waveforms

PO

Duty=93%

Duty=7%

Vin+= -260mV

Vin- = 0V

PO

Vin+= +260mV

Vin- = 0V

Carrier Frequency =

40kHz

Figure 1 Output waveform

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

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