How to provide different voltages to the user, through a single channel (switching)?.

Question

Hi folks:I have a question.energizesome little solenoids. In the board I have regulated 5, 12, and 24volts, andthose are the voltages I want to deliver. I think I can deliver moreor less300mA per channel (lets say: 5V-300mA, 12V-300mA, 24V-300mA). The lastare conservative values.The important thing is: the output should be directed to the userby using a single medium. So the user will have available 5, 12, XOR24,but not all at the same time. Nonetheless, those voltages are stillbeing used within the board, for some other tasks.So, I am wondering, which technology to use for achieving that???High side drivers and mosfets? (to switch between channels). (I dontlikethe space requirements)Another smarter solution?Drawing:5   -------             |12 ------- --------- output             |24 -------Best Regards...Franco.

st_yar · Accepted Answer

try lm317  or send me email with more details on my privatewith subject lm317 not good for my application then I will connect youwith the other solutions

Franco · Answer

Hi, unfortunately I have to use the voltages I have available and notto generate them again.The chip is also too big for my design. Space is an importantconstraint in this case.Cheers...Franco.

John Fields · Answer

---If you have to supply power to ground-referred loads, then I'd gowith P channel enhanced mode MOSFETS or PNP transistors. How are you planning on doing the switching?-- JF

Franco · Answer

Hi, the switching control will be done by a microcontroller on board.I am looking for P channel enhanced mode mosfet. Do I needa high side gate driver for  driving them?Cheers...Franco.

joseph2k · Answer

Does it have to be able to change on the fly? (or do you have the luxury of using a miniature rotary or slide switch or jumper or move a terminal to a different position?)

Franco · Answer

Hi Joseph, it must be able to change on the fly, but speed is notimportant.I have a microcontroller with some pins available to make theswitching.Cheers...Franco.

joseph2k · Answer

In that case i recommend two "TO-5" relays (actually in a TO-99 8 pin can, like an old op-amp). Two of them should have a smaller footprint than three reed relays. You probably will need transistors to drive the relays either way.

YD · Answer

Late at night, by candle light, Franco penned this immortal opus:

How do you distribute to the appropriate solenoid(s) on the receiving side, or how will you know which solenoid is connected?

- YD.

Franco · Answer

In our system, the user is responsible for that connection.Greetings...Franco.

How to provide different voltages to the user, through a single channel (switching)?.

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