Quote:
Originally Posted by SEBART PL
...
After my second set of mosfet failed, I have decided to put more of them in TO220 case
- I want to change IRFP4668PbF for irfb4115gpbf (150V 11mohm 70A ) 22 pieces
1. I want to ask is mic4451YN can manage those 22 mosfets? And do I need to change resistors gate parametrs ?
Data S:
mic4451YN http://www.micrel.com/_PDF/mic4451.pdf |
OK I will try to reply by myself.
1HZ = 1s
1/16KHZ=0,0000625 sek=62500ns
or
625000x16000 we should get about 1s
so driver will be call for every 62500ns
I have cheked speed for my gate Capacitance ––– 5270 ––– pF x22=115940 pF it is around 50ns for mic4451 so it is enough couse driver "rest" for 62500ns-50ns-recovery time50ns
IS THIS POSITIVE THINKING ?
or
maybe driver fill up all the gates for 50ns and then transistors start - mosfet got 18ns for start so maybe this could turn ON them not at once???
Sorry for this basic questions but I wish to be an electronic.
Quote:
Originally Posted by adamj12b
More isn't always better. having multip MOSFET drivers increases the chance of them being out of sync from each other turning switches on off microseconds before or after each other. Paul used one MOSFET driver because that was all that was needed to drive all of the MOSFETs. The total gate charge of all ten MOSFETs is still less than limit on one driver.
Adam
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Adam, I have seen your Coguar ver.2 with two drivers why is that, what benefits system with this two drivers?