Re: "Goosing" with a higher voltage
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Mon, 28 Apr 2008 12:04:32 -0400
eromlignod wrote:
Hi guys:
I have an application where I'm driving a device with 5 volts DC.
From time to time it is necessary to give it a short pulse of 24 Vdc
then revert back to 5V.
I have a power supply that has both 5V and 24V outputs. Can I just
pulse the 24V right onto the 5V line (with a power transistor or
relay) as long as I include a diode on the 5V output to avoid back
current? Or is this foolish?
It sounds like it could work. I would use a Schottky diode to minimize the voltage loss when the 5 volt supply was providing the load with current. I even that loss is too much, you might use a MOSFET as a synchronous rectifier (with the channel conducting in parallel with the body diode when the 5 volt supply was driving). But then, you have to produce a gate drive signal that is synchronized (non overlapping) with the disabling of the 24 volt drive control.
--
Regards,
John Popelish
.
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