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On page 4, bottom right, there’s a graph showing the maximum safe operating area SOA of the device.
IRLML Datasheet PDF –
Unimportant 1 6. 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.
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Sign up using Email and Password. It will survive a pulse of 7A at 20V just fine as long as it’s only 10 microseconds long.
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Home Questions Tags Users Unanswered. If the pulse is short enough, the FET will not heat up much and therefore survive just fine.
(PDF) IRLML2803 Datasheet download
That’s W dissipated in a SOT device. So if you just short its output to ground, it will die. I would place a 0 ohm resistor there for future experimentation. 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 dstasheet stage.
IRLML2803 PDF Datasheet浏览和下载
The Apps Engineer likely will not have access to any Fab details. 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 board 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.
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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. The chip specifies the “typical” LO output current as 1A, not an absolute maximum.
It’s not current that kills a FET, it’s overheating. The current might be internally limited. At t 0 any capacitor will act like a short circuit.