Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [reverse-recovery]

14 questions
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How bad is it to use 1N4007 as a bootstrap?

I have a moderately high power inverter board I've made. Standard 3 phase H-bridge with bootstrapped high side gate drivers. I've built a few, all have worked fine. They've all been pushing many kilowatts for many hours. This one works. The…
David Molony
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How does LTSpice model reverse recovery time?

Hello everyone, I am working on the prediction of the reverse recovery losses in a Buck converter. I have the following schematic: You can see below a zoom on the turning-off time of the diode: I am using the following models for the MOS and the…
dtc
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Diode reverse recovery time and the speed (snap back) in which recovery takes place

I'm looking at generating a circa 1 nano second current pulse by utilizing the snap-back time (usually measured in the tens of pico seconds) when a diode is "forcibly" reverse polarized after being forward biased for a short time. This answer from…
Andy aka
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Unexpected voltage spikes at output of PFET on falling edge

I have the circuit shown below: I want this circuit to switch between 2.5V and 3.6V at the drain of the PFET when I input a square wave into the gate of the PFET. I would expect that this circuit would do this - when I put 0V into the gate, the…
Spydercrawler
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Reverse recovery parameters

I'm trying to understand the principles of reverse recovery and read several documents about it, but there are still a few questions I cannot find an answer to or just don't understand. As reference to my questions I will use the application note…
Huisman
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Behaviour if we give forward voltage during the reverse recovery time of a diode

After the forward conduction, when the diode polarity is reversed, the diode goes to reverse recovery condition. What will happen if we give forward voltage again during the reverse recovery time of the diode? I mean before the end of the reverse…
Ali Raza
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Does diode reverse recovery time in Cockcroft-Walton Multiplier depend on current or negative voltage?

Say there is a multiplier whose sine wave input is 1 kV, 50 kHz, output should be 10 kV, 100uA. The high frequency means a fast diode should be used (low reverse recovery time trr). However, it seems the availability of fast high-voltage diodes is…
Hyp
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Why turn-on speed of a MOSFET is linked to diode reverse recovery time

Here is a quote from section 3.4 "Speed-Enhancement Circuits" in "Fundamentals of MOSFET and IGBT Gate Drive Circuits" written by Texas Instruments: When speed enhancement circuits are mentioned, designers exclusively consider circuits that…
Jess
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Why don't we worry about reverse recovery voltage and current of a diode in a simple circuit application?

When the diode goes into reverse recovery, why don't we worry about the power supply in that specific time since the current will be increased? Will it not damage the power supply or is it since it is happening so quick that realistically no damage…
Student
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How to model reverse recovery diode in LTSpice?

I wanted to update this subject as LTspice has evolved from this post: How does LTSpice model reverse recovery time? To sum up the above post answered by Ste Kulov: As Ste Kulov said, LTspice allows to model reverse recovery time. From the JEDEC…
Jess
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Why does reverse recovery behavior matter for half bridge bootstrap diode?

I have seen several recommendations in the past to use a schottky bootstrap diode in half bridge drivers, even if the driver integrates a Si junction diode for the purpose, because supposedly the reverse recovery of that diode would be really bad.…
tobalt
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Reverse recovery diode power loss in switching MOSFET

For designing a low side non-sync buck regulator I am looking for MOSFET(s) that can provide low overall power loss. Conditions would be 60V to 48V, 10A, 600 kHz (worst case), 1 Ohm source and 0.35 Ohm sink gate driver. Schematic would be as shown…
EarthLord
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Measuring reverse recovery time of a diode

What is the exact formula for reverse recovery time of a diode? I've read a bunch of articles regarding this question, and each of them answers differently -- the time interval between peak negative current and its either 10, 15 or 20% value. What…
LevGor
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How do I quantify the reverse current in a diode?

I am using a string of six diodes between a 4 kV, current limited, power supply and a capacitor to charge it to 4 kV. I then shut the supply off, hoping to leave the capacitor at 4 kV making it available to power a flash lamp. There is no other…
David Santos
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