High side current monitor with latch
in [Design]
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From: oparr on 19 Mar 2010 10:44 Does anything like this exist? I'm trying to short circuit protect a P- MOSFET switch operating in the range 12-40V @15A. Trying to avoid using discreet transistors or ICs (comparators, latches etc.) with relatively strict Vcc requirements. Thanks!
From: Joerg on 19 Mar 2010 16:02 oparr(a)hotmail.com wrote: > Does anything like this exist? I'm trying to short circuit protect a P- > MOSFET switch operating in the range 12-40V @15A. Trying to avoid > using discreet transistors or ICs (comparators, latches etc.) with > relatively strict Vcc requirements. Thanks! Best to post your schematic so people can see what's driving it. There are ICs with not very strict VCC requirements, for example the CD4000 series. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: MooseFET on 19 Mar 2010 22:41 On Mar 19, 7:44 am, "op...(a)hotmail.com" <op...(a)hotmail.com> wrote: > Does anything like this exist? I'm trying to short circuit protect a P- > MOSFET switch operating in the range 12-40V @15A. Trying to avoid > using discreet transistors or ICs (comparators, latches etc.) with > relatively strict Vcc requirements. Thanks! A fuse is a over current detector that latches open.
From: Jamie on 20 Mar 2010 11:16 oparr(a)hotmail.com wrote: > Does anything like this exist? I'm trying to short circuit protect a P- > MOSFET switch operating in the range 12-40V @15A. Trying to avoid > using discreet transistors or ICs (comparators, latches etc.) with > relatively strict Vcc requirements. Thanks! PTC fuse?
From: oparr on 21 Mar 2010 08:37
>Best to post your schematic so people can see what's driving it. Driver is a simple two resistor voltage divider...One resistor from high side to gate and the other from gate to low side. Vgs is normally half Vs. Overvoltage protection (a design requirement) prevents Vgs from exceeding Vgs max. That works fine. On Mar 19, 4:02 pm, Joerg <inva...(a)invalid.invalid> wrote: > |