AUIR3240S_15 Datasheet, PDF (8/17 Pages) International Rectifier – LOW QUIESCENT CURRENT MOSFET DRIVER

Timing definition
Vin
Ik1
Vgate-
Vcc
Ipeak
Toff
Vgsth
AUIR3240S
T
Vgate peak
Ipeak=Vrs th/Rs
IL
Vgate-Vcc
tdischarge
ton
Tdon K1
Vgs threshold
Tdoff K1
Vrsth
Vrs
Low quiescent current operation when On.
The AUIR3240S is able to operate with a very low quiescent current on the Vcc pin. Nevertheless the supply current
depends also on the leakage of the power mosfet named “I out leakage” on the diagram below.
The leakage current is given when K1 is off. When K1 is on, the current flowing in Vcc is the current charging the inductor.
Therefore the average current on the Vcc is the combination of the current when K1 is ON and OFF. The average current
on the Vcc pin can be calculated using:
8 www.irf.com
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October 21, 2013