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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 not be a good driver otherwise.

The chip specifies the “typical” LO output current as 1A, not an xatasheet maximum.

Sierra IC Inc

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? Unimportant 1 6. The poly most modern processes use poly gates has some resistance; different Fabs have their own secret sauces.

I would place a 0 ohm resistor there for future experimentation. Sign up or log in Sign up using Google. At t 0 any capacitor will act like a short circuit.


IRLML (IRF) PDF技术资料下载 IRLML 供应信息 IC Datasheet 数据表 (2/9 页)

Xatasheet FET can’t get rid of that heat but will absorb it in its thermal mass instead, heating up a little. Sign up using Facebook. It will survive a pulse of 7A at 20V just fine as long as it’s only 10 microseconds long. In fact, the datasheet for the MIC states: The Apps Engineer likely will not have access to any Fab details. Post Your Answer Discard By clicking datasheft Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The current might be internally limited. Home Questions Tags Users Unanswered.

DATASHEET IRLML5103TRPBF – International Rectifier MOSFET P Micro3

Sign up using Email and Password. It won’t be able to deliver 1A or more continuously, however – it can only do that for short pulses. Email Required, but never shown. Post as a guest Name. 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.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. 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. So if you just short its output to ground, it will die.


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It’s not current that kills a FET, it’s overheating. Mahendra Gunawardena 1, 9 On page 4, bottom right, there’s a graph showing the maximum safe operating area SOA of the device. That’s W dissipated in a SOT device. Owing to irlml28033 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.

If the pulse is short enough, the FET will not heat up much and therefore survive just fine.