Electrical Engineering Stack Exchange
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Questions tagged [mosfet-driver]

A circuit that accepts a small-signal digital input and produces as output a high current appropriate for driving the gate of a power MOSFET. See also the [gate-driving] tag.

A circuit that accepts a small-signal digital input and produces as output a high current appropriate for driving the gate of a power MOSFET. See also .

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Designing a *linear* MOSFET driver stage

I'm looking for a MOSFET driver circuit that can be placed between an op-amp and a power MOSFET to operate the transistor as a linear amplifier (as opposed to a switch). Background I'm developing an electronic load circuit that must be able to step…
scanny
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Bootstrap circuit for high-side MOSFET driver

I am very familiar with the operation of bootstrap drivers on MOSFET driver ICs for switching an N-channel high-side MOSFET. The basic operation is covered exhaustively on this site and others. What I don't understand is the high-side driver…
Dan Laks
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Is paralleling MOSFETs a good or a bad idea?

In my circuit making experience when faced with a problem wherein I need to switch a high current load with a MOSFET, my go-to solution has always been finding a better MOSFET that can handle the current and has low enough resistance in order for…
Jake quin
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How to design the gate resistor value?

This is the datasheet of the driver IC I am working on (LM5112). Following is the application diagram of the module. Basically this is the GATE driver circuit for the MOSFET with PDM signal as the input. I am looking for how to calculate value of…
vt673
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Driving highly inductive loads destroys mosfet driver

Background I am attempting to generate some relatively high voltages (>200KV) using a system of ignition coils. This question deals with a single stage of this system which we are attempting to make generate somewhere around 40-50KV. Originally the…
Los Frijoles
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BJT push-pull for a MOSFET

I'm looking for a way to drive a MOSFET with discrete components. Actually I need to drive a bunch of MOSFETs, with currents of 100-150A. And I'm wondering it would be possible not to use driving ICs, to have more control over functionality, less…
user95482301
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What is the difference between driving a MOSFET gate and an IGBT gate?

Can I use an suitable IGBT gate driver for driving the MOSFET, and vice versa? Which parameters (threshold, plateau, and turn on voltage ratings, gate capacitance, etc) must be the same for this compatibility? What are the essential differences…
hkBattousai
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Why doesn't shoot-through occur on totem-pole structure?

I'm designing a totem-pole by BJTs in order to drive a MOSFET. I studied on several online examples and built up my circuit according to what I understood from them. However, there is a detail which got stuck in my mind. I would like to know why…
hkBattousai
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p-channel MOSFET switch

I want to use a MOSFET as a switch driven by my microcomputer. The original circuit using N-channel MOSFET is on the left side. Honestly, I do not understand the choice of the IRLZ44. The circuit is designed for Arduino, which has 5V logic. …
Pygmalion
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How to increase mosfet switching speed, and decrease switching losses?

I hope this is not a too broad question, but what are the best practices to achieve fast switching on a MOSFET driven by a PWM signal? My current knowledge tells me I can do two things: 1 - To use the lowest possible PWM frequency, because switching…
Marcovecchio
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Why can't an MCU's GPIO pins directly control power MOSFETs?

I'm looking at electronic speed control circuit design, and notice that most use a driver IC like TI's DRV series of chips. At the moment, sourcing these chips is extremely difficult, so I'm wondering why the MCU GPIOs can't switch the MOSFETs…
Bez_almighty
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What causes this knee in my MOSFET drain voltage drop?

FINAL UPDATE: Understand a previously mysterious power MOSFET switching waveform wiggle! @Mario uncovered the root cause here below, distinctive to so-called VDMOS devices, typical of many power MOSFETs like the IRF2805. UPDATE: Found a clue!…
scanny
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Why have my MOSFET drivers blown in this H-Bridge?

I've built a discrete H-Bridge circuit to run a reasonably beefy 12V windscreen wiper motor. The circuit is below (EDIT: see here for a bigger PDF, StackExchange doesn't seem to let you expand the image): RM: See larger imgur image here - these are…
xwhatsit
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Can I drive a low-voltage MOSFET gate directly from a microcontroller?

We're working on this project for school where "reducing the number of components is essential". We need to operate a little brushed DC motor so we thought of using a simple low-side drive configuration with an N-channel MOSFET like this one here:…
Andrea Toffanin
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Can you drive a P-MOSFET as a high side switch directly from a microcontroller?

I have an engineering background, but close-to-zero practical experience with discrete electronic circuit design. simulate this circuit – Schematic created using CircuitLab Regarding the above schematic, let's say I have a P-MOSFET (type SiA441DJ),…
Oliver Richter
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