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On Sat, 18 Jul 2020 20:10:45 +0200, Piotr Wyderski
<peter.pan@neverland.mil> wrote:
Bigger than SOT-23.
We have LTC3803 in stock and they work great.
Here\'s my circuit so far:
https://www.dropbox.com/s/gnyjq9ufo34pvao/8-chan_Flyback_1.asc?dl=0
It has ground-side flyback voltage feedback (D3 etc) to make the
isolated voltages about 200, so I can regulate them to 150.
Since the Coilcraft transformer has dual secondaries, I guess I could
have one transformer power two channels, with a voltage doubler in
each. That would be fun. The caps in the doubler could be current
limiters, so I could shunt regulate.
--
John Larkin Highland Technology, Inc
Science teaches us to doubt.
Claude Bernard
<peter.pan@neverland.mil> wrote:
jlarkin@highlandsniptechnology.com wrote:
We use a ton of TPIC6595, a simlar part, as our universal relay and
LED driver. But I don\'t need independent control, and there will be no
uP or FPGA or anything.
You don\'t need an MCU. Just connect SER IN to VDD, SER CLK to G and have
fun.
I think one big fet can drive all 8 flyback transformers.
8*150V*1e-3A=1.2W
*Big* fet?
Bigger than SOT-23.
Use both channels of IR21531 to drive two out of phase flybacks.
We have LTC3803 in stock and they work great.
Here\'s my circuit so far:
https://www.dropbox.com/s/gnyjq9ufo34pvao/8-chan_Flyback_1.asc?dl=0
It has ground-side flyback voltage feedback (D3 etc) to make the
isolated voltages about 200, so I can regulate them to 150.
Since the Coilcraft transformer has dual secondaries, I guess I could
have one transformer power two channels, with a voltage doubler in
each. That would be fun. The caps in the doubler could be current
limiters, so I could shunt regulate.
--
John Larkin Highland Technology, Inc
Science teaches us to doubt.
Claude Bernard