Controller IC help 1

[Tyler62]

Im looking for an IC that i can run off of 5V DC from a microcontroller to control the on/off of components that will be using 12-24V DC to operate. I was just going to use one transistor to control another transistor/scr but i know there are more "up-to-date" methods by using IC's. Can anyone suggest an IC to do this?

Thanks in advance

 

[MacGyverS2000]

run a google search for solid state relays...most of the major chip maufacturers have them (Maxim, Analog, TI, etc.)

 

[ScottyUK]

Add Crydom to the list



-----------------------------------

"Never look down any at anybody, unless you are helping them up."

Jesse Jackson.

 

[nbucska]

How much current do you need?

<nbucska@pcperipherals DOT com> subj: eng-tips

 

[Tyler62]

3-4 Amps

 

[Comcokid]

If you only need a few tens of ma, there are devices available.

However, for the higher current the easiest way is to use a logic-level input N-channel MOSFET, and switch ground to the item. There are some available in dual surface-mount packages.

However, for external devices in some applications, ground switching is an unacceptable practice. Power switching is preferred which leads to an intermediate device to switch a P-channel MOSFET, or bootstrap supply arrangements still using an N-channel.

For 12 to 24 VDC, you might check for some semiconductor power devices designed for the automotive market.

 

[felixc]

Take a look at a "high-side switch". (search for that keyword) This is what's used in automotive and at voltages up to 48 volts DC. Several max currents are supported: 3, 5 amps. International Rectifier and some others make such parts. Most models can be triggerd by a logic signal, the integrate the MOSFET the control logic and protection circuits. And they're cheap too. I used it for a soft turn-on/turn-off circuit in an automotive application and it worked great.

Felix

 

[blcpro]

You could go the old-fashioned route and use a simple 5V relay. Also, check out Digikey (

http://www.digikey.com).

They have a good selection for ALL of the solutions posted. good luck!

 

[Tyler62]

Thanks for the help guys, especially you felix, im actually using wiper motors because i needed more current for my applications so the automotive option is a very useful one.

Thanks again to everyone who replied.