Re: MOSFET for Reverse Polarity Protection

On Tue, 26 Apr 2005 18:45:25 -0700, Jim Thompson
<thegreatone@xxxxxxxxxxx> wrote:

>On 26 Apr 2005 18:03:30 -0700, Winfield Hill
><hill_a@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>>Jim Thompson wrote...
>>>
>>> "An idea that I have seen is to place a 5.1V zener diode across
>>> the power input. This will short the supply if applied with
>>> the wrong polarity and attempt to clamp it to 5.1V IF TOO HIGH
>>> A VOLTAGE IS APPLIED. ..."
>>>
>>> Which is why I posted a full solution to the query.
>>
>> OK, I stand corrected. He'll need two FETs and your circuit.
>
>No problem. Two threads just got stirred together.
>
> ...Jim Thompson

Win, I just had a remembrance that I thought you'd get a kick out
of...

I did a charge pump design that has the PMOS bodies (N-well) tied
together and left to float.

Clocking the pump devices causes the N-well to charge up (it's just a
big capacitor) to the highest potential in the pump chain... so you
don't have to worry about back-flow... it's automatically biased to
prevent it.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
.

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