IRS2332DSPBF Datasheet, PDF (24/39 Pages) International Rectifier – 3-PHASE-BRIDGE DRIVER

IRS233(0,2)(D)(S&J)PbF
Supply Capacitor: It is recommended to place a bypass capacitor (CIN) between the VCC and VSS pins. This connection is
shown in Figure 35. A ceramic 1 µF ceramic capacitor is suitable for most applications. This component should be placed as
close as possible to the pins in order to reduce parasitic elements.
Figure 35: Supply capacitor
Routing and Placement: Power stage PCB parasitic elements can contribute to large negative voltage transients at the switch
node; it is recommended to limit the phase voltage negative transients. In order to avoid such conditions, it is recommended
to 1) minimize the high-side emitter to low-side collector distance, and 2) minimize the low-side emitter to negative bus rail
stray inductance. However, where negative VS spikes remain excessive, further steps may be taken to reduce the spike. This
includes placing a resistor (5 Ω or less) between the VS pin and the switch node (see Figure 36), and in some cases using a
clamping diode between VSS and VS (see Figure 37). See DT04-4 at www.irf.com for more detailed information.
Figure 36: VS resistor
Figure 37: VS clamping diode
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