Another fast transistor, good gate driver

Jan 29, 2018 1 Replies

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Look at that fT. One small part of your favorite new SiC gate driver, perhaps?



Don't know why they don't call out complements, but this looks close:

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Tim


Bipolars are just never screaming fast switches [1]. That PNP is losing Ft fast above 1 amp. Ft = 300 MHz means a beta of one at 300 MHz, which is where a follower becomes useless. At 2 amps, Ft is way below 100 MHz.

Mosfets or better yet GaN fets could drive a big SiC a bunch faster.

The problem with GaN is that they are all n-channel, so making a pullup/pulldown gate driver can be a nuisance. TI and Peregrine have some half-bridge bootstrapped drivers for GaN, but they have high prop delays and maybe big minimum pulse widths.

This sort of thing is fun because it's so hard.

[1] especially the ones that are not EOL'd.
John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com

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