Re: undervoltage lockout for flyback powersupply input
- From: Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@xxxxxxxxxxx>
- Date: Mon, 03 Dec 2007 18:42:01 -0500
Jamie Morken wrote:
Jamie wrote:Yes, you have it correct, the DIAC are a cheap way of closing a
Jamie Morken wrote:
For simplicity reasons, Get your self a DIAC rated around 75 volts
Hi,
I have a flyback powersupply that operates from about 20V to 450V+ (AC or DC input) and I would like to reduce the operation to 75V to 450V,
what is a possible circuit to use on its input to keep it from starting
up until this threshold is reached?
cheers,
Jamie
connect one end to the cathode of D34 and the other end will be
the V+ supply for R5 instead of connecting R5 directly to V+.
Never used Diac's before, from what I read it looks equivalent to
back to back zeners except the DIAC stays on until the current
drops below a threshold, is this correct? Would back to back
zeners, work for this as well?
cheers,
Jamie
circuit and opening it how ever, depending on the spec's, You
need to tailor the circuit so that the holding current will
drop below spec at the desired point to have it open again.
--
"I'd rather have a bottle in front of me than a frontal lobotomy"
http://webpages.charter.net/jamie_5
.
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