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On page 4, bottom right, there’s a graph showing the maximum safe operating area SOA of the device. Post as a guest Name. Mahendra Gunawardena 1, 9 It’s not current that kills a FET, it’s overheating.
MOSFETs like the ones in the MIC’s output stage can handle large current pulses for a short time by simply absorbing the heat generated by the pulse in their thermal mass. Unimportant 1 6.
Owing to the fact that this gate driver features adaptive dead-time and thus monitors the gate of the MOSFET to determine when it has fully turned off, a gate resistor prevents proper sensing of the actual gate. It won’t be able to deliver 1A or more continuously, however – it can only do that for short pulses. The FET can’t get rid of that heat but will absorb it in its thermal mass instead, heating up a little.
This current is limited by its internal output resistance since there doesn’t seem to be a limiting circuit according to the datasheet’s diagram of the output stage.
Sign up or log in Sign up using Google. Without a gate resistor the only thing limiting the current is the gate driver’s output resistance, which is supposedly low, it would not be a good driver otherwise. At t 0 any capacitor will act like a short circuit. Sign up using Email and Password. That’s W dissipated in a SOT device. The poly most modern processes use poly gates has some resistance; different Fabs have their ir,ml2803 secret sauces.
If the pulse is short enough, xatasheet FET will not heat up much and therefore survive just fine.
I would place a 0 ohm resistor there for future experimentation. In fact, the datasheet for the MIC states: It will survive a pulse of 7A at 20V just fine as long as it’s only 10 microseconds long. So datasheef you just short its output to ground, it will die.
The Apps Engineer likely will not have access to any Fab datadheet.
Home Questions Tags Users Unanswered. Sign up using Facebook. As long as that doesn’t cause it to get hotter than its maximum junction temperature, no harm will be done. The current might be internally limited.