AUIR3330STRL データシートの表示（PDF） - International Rectifier

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AUIR3330STRL

PROTECTED HIGH FREQUENCY HIGH SIDE SWITCH

International Rectifier 

AUIR3330S

Sense Load current feedback and programmable current shutdown

The Ifb pin allows an analog measurement of the load current and with an external resistor allows to program the

over current shutdown level from 10A to 50A. The voltage threshold level of the Ifb pin is internally set to 4v (See

the formulas below). It is also possible to dynamically adjust the current shutdown protection versus time by

adding some external components. This protection is latched and turns off the output MOSFET without di/dt

sequence to reduce the device and the application stress. The operating mode is recovered after resetting by the

sleep mode.

Rifb 

Vifb _ gnd min

 Ratio min

Imax _ appli  Ioffset min

Vifb min@T C  Iload  Ioffset max@ T C  Rifb

Ratio max@ T C

Ishd max  MAX Ishd max@ 40C; Ishd max@ 25; Ishtd max@150C

Ishd

max@

T

C









Vifb _ gnd max

Rifb(calculated )



Ratio

max@

T



C





Ioffset

max@

T

C

Vifb max@ T C  Iload  Ioffset min@T C  Rifb

Ratio min@T C

Where:

Imax appli is the maximum application current

Ishtd max is the maximum output shutdown current

Internal over current shutdown

The maximum current shutdown threshold value is internally fixed to 65A typ. This protection is latched and turns

off the output MOSFET without di/dt sequence to reduce the device and the application stress. The operating

mode is recovered after resetting by the sleep mode.

Under voltage lock-out

The AUIR3330S remains operational from UV off threshold. Under this continuous voltage, the device will be

locked until the voltage recovers the operating range, according to an internal hysteresis fixed to 0,5V min. The

maximum rating voltage is given by the Trench VDMOS technology where the avalanche voltage is up to 43V

typically.

Sleep mode and reset fault:

The sleep mode is enabled if the IN pin stay low (Vin < V In Slp) more than T Slp time. The consumption in sleep

mode is Icc off. The AUIR3330S wakes up at first rise edge on the IN pin (Vin > V In Slp). This mode allows

resetting all the latched faults after Trst time (Cf. Error! Reference source not found.). This filter time allows

memorizing and maintaining the fault latched even if the power supply is removed (ISO pulses latch protection).

10 www.irf.com © 2012 International Rectifier

May 29, 2014

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