I have a TI UCC383-adj chip and need to use the inhibit pin however the inhibit pin is for a N/C switch. I need to use a small tact switch so i must convert it to a N/O . I know i will need to use a mosfet but what kind? Does anyone have a mosfet part number that will work for this

Btw the chip will be ran off a 7.4v li-po . Heres the datasheet for the chip
http://www.ti.com/lit/ds/symlink/ucc383-adj.pdf

Things i need
-Small package recomended
- cheapest mosfet possible
-How to use it in the circuit

Thanks

 

Fdv301

tsm2303

 

2N7000


(plus some more dummy characters so the post gets accepted)

 

Are you talking about the SD/CT pin that you pull low to enable shutdown?
Maybe you mean you have a momentary switch or something?
Did you read page 8?

 

Are you talking about the SD/CT pin that you pull low to enable shutdown?
Maybe you mean you have a momentary switch or something?
Did you read page 8?

No, nothing to do with shutdown . I need it so i can use a low amp tact(mometary) switch.Thats why i need to use the inhibit/on/off pin however they dont make tact switches in N/C configuration which is why i need to change that to be able to use a N/O switch.I guess using a mosfet of vin will work too.

Basically anyway possible that i can use a N/O tact switch to turn the thing on and not need a 5A pushbutton or N/C switch.

 

Just about any N ch FET, BS170 [R. S.], 2N7000?, NTE490, etc.

 

Of course, you could always use a pull up resistor on the inhibit pin and a common NO switch to ground and skip the FET altogether.