Using the wrong IDRIVE setting can damage your FET or DRV as it often causes excessive ringing and/or cross-conduction when the Gates are slammed on or off too strongly. This document discusses the methods and some Do's and Don'ts
Configuring IDRIVE for an exact FET part number is essential to the well tuned operation of the system. This tuning balances Thermal performance with Device performance while ensuring longevity of your DRV and FETs. To best select IDRIVE settings, please follow the following steps:
Use the following equation to calculate the needed IDRIVE current in mA (rise and fall use the same equation):
The goal of the correct IDRIVE setting is to allow fast switching of the FET so that the resistive region of the FET is limited while also preventing ringing of the switch node and gate signals. Driving the gates too hard can damage the FET, DRV, or cause excess ringing and noise in the system. If this IDRIVE setting is too low and not fully enhancing the FET, the FET and DRV may undergo unnecessary heating. To resolve this, the IDRIVE can be increased one or two settings higher until better enhancement is reached but not so much that ringing is caused.
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