Delay in PWM start for open collector drive

marcf

Joined Dec 29, 2014
288
Sorry I misunderstood.

With a current gain in the thousands, a base current of 1ma should give you plenty of sink current to work with.
The darlington in the circuit looks like a great part, but a little overkill for this app don't you think? Also the term "darlington pair" seems redundant.

Glad to hear it is working.
 

ScottWang

Joined Aug 23, 2012
7,397
Sorry I misunderstood.

With a current gain in the thousands, a base current of 1ma should give you plenty of sink current to work with.
The darlington in the circuit looks like a great part, but a little overkill for this app don't you think? Also the term "darlington pair" seems redundant.

Glad to hear it is working.
Pick any bjt can be works very good in this case, because the TS didn't given the whole picture, so we will concerned too much.
 
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