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I would place a 0 ohm resistor there for future experimentation. The current might be internally limited. The chip specifies the “typical” LO output current as 1A, not an absolute maximum. Email Required, but never shown.
Sign up using Email and Password. Sign up using Facebook. That’s W dissipated in a SOT device. On page 4, bottom right, there’s a graph showing the maximum safe operating area SOA of the device. The Apps Engineer likely will not have access to any Fab details.
IRLML MOSFET Datasheet pdf – Equivalent. Cross Reference Search
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. Home Questions Tags Users Unanswered. In fact, the datasheet for the MIC states: 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.
It won’t be able to deliver 1A or more continuously, however – it can only do datasheef 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. Mahendra Gunawardena 1, 9 It’s not current that kills a FET, it’s overheating.
IRLML2803 MOSFET. Datasheet pdf. Equivalent
My thinking is this should lead to current peaks that easily exceed the driver’s 1A maximum peak current and damage the chip, but the evaluation datahseet demonstrates that this is not the case, what am I missing? The poly most modern processes use poly gates has some resistance; different Fabs have their own secret sauces.
Post as a guest Name. As long as that doesn’t cause it to get hotter than its maximum junction temperature, no harm will be done. Without a gate resistor the only thing limiting the current is the gate driver’s output resistance, which is supposedly low, it would datawheet be a good driver otherwise. So if you just short its output to ground, it will die.
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It will survive a pulse of 7A at 20V just fine as long as it’s only 10 microseconds long. If the pulse is short enough, the FET will not heat up much and therefore survive just fine.
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.