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Oct 12, 2019 at 13:04 comment added D.A.S. Even a 100Vdc fan can be driven this way as long as the base driver gives at least 5~10% of the load current.
Oct 12, 2019 at 5:18 comment added D.A.S. added current limit base R. higher V+ ok
Oct 12, 2019 at 5:17 history edited D.A.S. CC BY-SA 4.0
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Oct 11, 2019 at 22:28 vote accept wgthompson
Oct 11, 2019 at 22:27 comment added wgthompson Also quick question, if I were to want to use a more potent fan (lets say 12v) would this approach still work?
Oct 11, 2019 at 22:22 comment added wgthompson By the way I am using OD4010-05HB55-FAN, about .19A draw
Oct 11, 2019 at 22:20 comment added wgthompson Sunnyskyguy I am a little confused however, you have the pnp stage before the npn. So when THERM goes low 3.3 will pass through to the base of the npn (q3), wont this voltage still not turn on q3 since since still less than V at q3s collector (5V)?
Oct 11, 2019 at 18:36 history answered D.A.S. CC BY-SA 4.0