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Diode Turn-On Time Induced Failures in Switching Regulators
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- čas přidán 18. 03. 2010
- with Jim Williams, Staff Scientist
video.linear.co...
Most circuit designers are familiar with diode dynamic characteristics such as charge storage, voltage dependent capacitance and reverse recovery time. Less commonly acknowledged and manufacturer specified is diode forward turn-on time. This parameter describes the time required for a diode to turn on and clamp at its forward voltage drop.
RIP Jim. A teacher for many more he ever imagined.
So few, who taught so much, to so many!
And I think that Jim was one of the nicest of the very small group...
As I have seen, "everybody" publishes reverse recovery data. That of course is good as far as it goes. The reverse recovery time current and associated voltages cause power spikes and overall heating of the transistor and the diode. But I have had my battle with the forward recovery as well. Not going to too much details, it was an 80 V, 500 A buck regulator. I ended up adding some smaller and faster diodes in parallel with the too slow ones. There were 3 small diodes in series, so their forward voltage was higher than the single slow diode had and the small ones conducted only very short time to clamp the voltage spike. I also minimized the physical loop length through the small diodes combo before the result was satisfactory.
I learned something new. There are only few who can be concise, accurate like that. Thanks to YT we have at least some memories preserved of these great teachers
You are missed, Jim.
Rest in peace...
Jim, Working with you for 20 years was the High Point of my Career, RIP JIm Williams!
Jim was, and still is, a hero in the engineering world
Thorough and concise as usual. I really wish we had not lost such a brilliant mind. I know I speak for many others that I wish there were more videos of these test setups from Jim. Thankfully we are left with some at least!
Anyone looking at this video will see that Jim's Parkinson's was already advancing, but it Never Stopped him from doing what he Loved!
Jims writings in the LT appnote books were essential reading for me during my EE education in the 80:s. I still read them. Much appreciated, thank You Jim, RIP.
Brilliant man. Such a tragic loss.
I'm more on the digital side, but I just designed a buck converter with an LT chip, so this is great information.
Mr.Jim you were a genius! Thanks for all you did!
good info...as a tv repair tech I've often wondered why parts break down and go bad.
Thank you Jim, what a legend you were.
Nice vid, I once carried out a similar test on very high power snubber diodes. My rig was a 2kV pulse cap and a spark gap for a nice sharp rising edge. The turn on overshoot is dependant on the I di/dt of the rising edge (not covered in the vid)
Did a study on a similar setup and also found simple spark gaps to be the best solution! This was for an HV ESD discharge setup. Tried various gas discharge and solid state devices, spark gaps worked best.
Thanks a lot Jim and Liner.
You are such a saver.
Jim Williams will be missed.
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Thanks Jim...
I understand
Good job
May you receive messages in heaven...
Some information about this in schottky diode datasheets would be nice, dear discrete semiconductor manuifacturers.
Some of them do include transient response, but only few that´s true. Sad that a lot of datasheets are either books with ads or/and badly written.
Thank you for your time!
Brilliant!!
Very informative, thank You!
A true God of analog design.
why his arm is shaking?
Jim suffered from Parkinson's disease for the last five years of his life
Thankyou for sharing, rip jim williams
Can't call you direct I'm afraid :'(
Старичок уже, но всё равно держится