Drive a 0.5A load with Pic

Status
Not open for further replies.
D

dkace

Full Member level 6
Joined
Jun 13, 2002
Messages
395
Helped
32
Reputation
64
Reaction score
7
Trophy points
1,298
Location
Greece
Activity points
3,562
Suppose I want to drive a 0.5A load with my PIC . Somehow the PIC decedes to open a valve ie. Should I use relay or just a n amplifier? How much current can I get from PIC? ( small I guess).
D.
 

Currents of microcontrollers pins are in the small mA range (≈20mA and less), so to drive a load of more than that you can use bipolar or (mos)fet transistor rated above the load's current..
 

may be opto-coupler may help!
 

From the output pin of the pic.
Take a 4k7 resistor and feed this into the base of a darlington ( tip110) you can then drive a 500ma load. If the load is inductive protect the collector of the darlington with a diode.

Barrybear
 

U can also use a buffer(such as ULN2804) from your PIC output. The output of the buffer connects ur req. load. Pic can't drive a relay I think. If you want to use transister,its hfe should be greater than 25, to drive 0.5A load.
 

What is your load ?
Why not use BC337, 2n2222, ULN2803, or L293... ?
 

A Mosfet should be able to handle that current
 

use a simple transistor,

or use ULN2003 darlington chip
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…