AUIR3200S Datasheet, PDF (13/22 Pages) Infineon Technologies AG – MOSFET DRIVER WITH PROTECTION AND DIAGNOSTIC

AUIR3200S
If the inductance of the load is too important, the power on reset is not enough long to charge completely the bootstrap
capacitor before turns on the power mosfet.
So the micro-processor need to implement a special sequence to start the device without activates the output power
mosfet.
The micro-processor send one short pulse (Twkp max < short pulse < Tpwr_on_rst min) then wait for the bootstrap
capacitor is totally charged and after provide the appropriate duty cycle.
The bootstrap charge depends of the battery voltage, the bootstrap capacitor value and the inductance load value.
Power on reset
time
V_{in Twake min}
V_boot
charged
V_gs
Time to charge the
bootstrap capacitor
Figure 11
13 Rev 1.1
2016-05-02