Quote:
Originally posted by Yo-DUH_87
The diode in the mosfet is not a zener, it is a body diode.
|
Hey, hey, hey. That's getting extremely picky. Uh, err.... nevermind.
You're right, I was speaking sloppily in calling it a zener. The fact is though, that for practical purposes, it can generally be treated as a zener. That is the reason the symbol for a zener diode is shown within the MOSFET schematic symbol.
Quote:
Originally posted by Yo-DUH_87
[b]
When I was assisting ben with the design, I did look at the mosfet drivers specs. It is rated for 250 microamps, the mosfet power drain is around 9 nanoamps. That should allow sufficent head-room. Those are prety powerful drivers there. The drivers I used I believe had a current of around 10 microamps (again, check me on that), and put out about a volt over typical.
|
The output current of the driver is not much of an issue for steady state operation. (It's a big issue at the time of switching.) Assuming the load can tolerate a slowly rising rail at powerup, the main issue is the output voltage.
Designing around the performance of particular parts on hand is fine if you are just building a one-up version of something for yourself. If there is any possibility that you might promote the design to others, it would be a good idea to design according to the worst case specs provided by the manufacturer. The LTC1163 is totally inadequate for designing a circuit for switching 12V. That's not what it is designed for. The fact that a person may get it to work, definitely does not mean another person can expect to get the same results.
Quote:
Originally posted by Yo-DUH_87
Since87, are you and BillA related in any way 
|
I don't know, but I suspect Bill may also be a member of the brotherhood of Men United in Chastising Otherwise Unchecked Stupidity. Pteww. (Spit when you say that.)
Doesn't really count? Well then if you go back about 100,000 years...