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1 vote

Gate driving circuit loss

what is the mathematical equation for calculating total loss for this circuit? It's the sum of the following three losses: Conduction loss: Basically, the I2R loss of the switch element, GaN FET in ...
Rohat Kılıç's user avatar
5 votes
Accepted

Will my gate driver work for this situation?

Q2 is upside down and you're missing the rectification diode for your boost converter. Apart from that, it should work, but not at high frequencies. (10kHz is probably fine.) To extend the operating ...
Jonathan S.'s user avatar
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1 vote

Is Vgs a concern when using a high-side FET driver?

FYI, this style of high-side driver is a bit peculiar, and, I think, makes a number of special-case assumptions. In short, you are right to be concerned; whether that concern manifests in any given ...
Tim Williams's user avatar
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3 votes

Is Vgs a concern when using a high-side FET driver?

It is a concern. The MOSFET datasheet always lists Vgs as a +/- number after all. High-side drivers should be taking this into account, and I think this one does. Notice where the control input runs. ...
DKNguyen's user avatar
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0 votes

How necessary are gate resistors for MOSFET gate driving?

How necessary are gate resistors for MOSFET gate driving? Adding resistors actually slows down the charging and discharging of the gate, which seems to contradict the recommendations in general ...
Rohat Kılıç's user avatar
0 votes

How necessary are gate resistors for MOSFET gate driving?

It's also possible that the ringing you observing is in part an artifact due to the length of your scope probe and ground loop. Try repeating the measurement with a "stabber probe" (you ...
Aaron's user avatar
  • 1
1 vote

How necessary are gate resistors for MOSFET gate driving?

In Smps you have two choices: Use a low gate resistor, i.e. perform fast cutting/switching, but since leakage energy of inductor in power circuit is always presented you have to use a snubber or some ...
Michal Podmanický's user avatar
11 votes

How necessary are gate resistors for MOSFET gate driving?

The gate resistor does two things: it dampens the Colpitts or tuned-gate oscillator mode when a very low impedance is connected, and sets switching speed. Oscillation mode, first: simulate this ...
Tim Williams's user avatar
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4 votes

How necessary are gate resistors for MOSFET gate driving?

I don't see why you think resitors contradict the design requirements. And yes, you do need to worry about ringing, and about the resistors. The ringing is bad because it means more electromagnetic ...
Justme's user avatar
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