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Power Interface Forum
Selecting between 2 power supplies
I have 2 regulators, 12v and 5v from a battery to supply 6 sensors that draw 30mA each..
Each sensor can be configured individually to be supplied by 12v, 5v and OFF. The design requires low-power solutions.
Anyone have a suggestion on how to do this?
Thanks in advance.
You could connect both power supplies to all the sensors, and with your control logic, enable one of the two power supplies, or disable both of them.
But I am not sure that I understand the question.
I must control each sensor individually to be powered with 12, 5 or not powered.
Thanks for the help.
You can use analog switches or single FETs. The analog switches like TS12A44513 have the advantage of integration, but the cost is relatively high Rdson.
If you use MOSFETs, you have a lot of possibilities since you are talking of very small current switching, for simplicity of driving I would choose a P channel, and logic level since you are working also at 5V. You can easily achieve much lower Rdson resistances when using single MOSFETs, there are integrated packages with several MOSFETs in them.
You might want to post a block diagram that shows what you are trying to do. That will help to clarify your question.
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