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Controller IC help

Controller IC help

Controller IC help

(OP)
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

RE: Controller IC help

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

RE: Controller IC help

Add Crydom to the list

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

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

Jesse Jackson.

RE: Controller IC help

How much current do you need?

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

RE: Controller IC help

(OP)
3-4 Amps

RE: Controller IC help

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.

RE: Controller IC help

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


RE: Controller IC help

You could go the old-fashioned route and use a simple 5V relay.  Also, check out Digikey (www.digikey.com).  They have a good selection for ALL of the solutions posted.  good luck!

RE: Controller IC help

(OP)
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.

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