Re: Help with power issues
- From: "Paul E. Schoen" <pstech@xxxxxxxxx>
- Date: Thu, 2 Apr 2009 17:29:55 -0400
"linnix" <me@xxxxxxxxxxxxxxxxxx> wrote in message
news:62a13959-49f9-4847-8998-9fdd04e8e91c@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Combining a few posts:
On Apr 2, 1:18 pm, Eeyore <rabbitsfriendsandrelati...@xxxxxxxxxxx>
wrote:
Spehro Pefhany wrote:
And why don't you just buy "HV" type LCDs that can handle two series
batteries? Do you really need to regulate the battery voltage at all?
That would be perfect. And is the LCD really that intolerant of inputs >
Vsupply ?
Yes, unfortunately. Can't drive it over 3V.
How about driving the gate of a PMOS with a PWM signal from one pin on the
ASIC, into an RC to get a lower voltage for the LCD. You might even be able
to use the logic level drive from a pin directly if it has enough current
capacity. If it really needs to be well regulated, maybe you can use an A/D
to monitor the LCD voltage and adjust PWM. This type of regulator would
consume very little power.
Paul
.
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