Load switch MOSFET

Status
Not open for further replies.
duffy said:
That's not telling us what you are driving it with. Makes a big difference.
Click to expand...


Driving What ? I gave you the part number its a dedicated chip . It doesnt make any difference if you condition a bridge or an RVDT , please have a look into the datasheet.If it does please point me.

-Adi
 
Yes. This circuit would be the kind of thing you want for that. A high logic level will turn on both supplies, a low will turn them both off.
 

Attachments

  • sw2.gif
    3.6 KB · Views: 319
Last edited:
duffy said:
Yes. This circuit would be the kind of thing you want for that. A high logic level will turn on both supplies, a low will turn them both off.
Click to expand...
The only concern I have is that the circuit dissipates almost 1 Watt, most of it in the 1k resistor. That resistor could be changed to 1.5k, which would reduce the dissipation to less than 600mW, but it's still pretty high. Changing the load switches to MOSFETs (and changing some resistor values) would allow the dissipation to be reduced dramatically, as long as switching speed isn't an issue.
As a side issue, the value of R4 could be at least an order of magnitude larger.
 
Ugh, I didn't even notice that. Here, got rid of the 1 watt resistor. On state resistance is .3 ohms, 50v breakdown, over an amp of on-state goodness in a TO92 or smaller package.
 

Attachments

  • sw3.gif
    3.8 KB · Views: 196
Last edited:
Thanks duffy the negative MOS schematic is good , Though I was a bit reluctant with the BJT pasrt due to its heavy dissipation.
 
Guad, how far can this thread run (despite the fun diversions). Remind me why Boncuks, Ericiaks and my suggestion of a miniature DPDT relay isnt the simplest, smallest, fastest and bestes solution?.
 
Status
Not open for further replies.

Similar threads

S
  • Question
which mosfet
Replies
10
Views
1K
Pommie
P
P
Switching P MOSFET slowly.
Replies
19
Views
1K
ACharnley
A
  • Question
Is it possible to use IC 555 for all MOSFET switches of power supply?
Replies
7
Views
1K
Papabravo
S
  • Question
Modeling Microcontroller Load
Replies
7
Views
1K
ZipZapOuch
F
  • Question
I don't understand this MOSFET configuration
Replies
6
Views
1K
crutschow
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…