Clamping Mechanisms; Adding Drs Clamps - Active-semi PAC5532EVK1 User Manual

Clamping Mechanisms

When current load increases, destructive voltage transients can be observed. These transients are usually
prevalent during dead time, when current must find an asynchronous path (e.g. FET body diodes) to continue
its flow. Controlling these transients is of utmost importance to protect both the power switches as well as the
PAC5532 pre drive power stage block.

Adding DRS Clamps

The PAC5532EVK1 evaluation module already incorporates a series of clamps put in place to protect the
DRSx terminal from negative transients at the phase outputs. However, under high current scenarios, it is
plausible to see large positive transients. It is recommended to place a similar diode from DRS to VM in order
to clamp the PHASE output to VM.
- 13 - Rev 1.0 February 2018