I have a battery pack (12V) and a brick supply (12V) and I want to use a P-channel FET to switch between the two and create feedback to a uC in the process. How would I go about doing that?
Auto Detect Supply with P-channel FET
- Thread starter nethanger1
- Start date
How about the current of two 12V?
What's the load of two 12V? (current of load?)
What do you mean of feedback to a uC, does it means that to indicate which 12V is using?
If you want to switch between two 12V then you should using two P channel not only one.
What's the load of two 12V? (current of load?)
What do you mean of feedback to a uC, does it means that to indicate which 12V is using?
If you want to switch between two 12V then you should using two P channel not only one.
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So V1 is a brick power supply and V2 is a battery. With this input circuit, the p-channel mosfet would be closed when the brick is not plugged in. When the brick is plugged in, the fet opens the battery circuit drawing only from the brick now. The Vin signal goes to a two buck converters, one bucking down to 5V and another bucking down to 7.3V (only when the brick is plugged in).
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If you want to using P MOSFET, have you ever considering about the sat voltage of Vgs when you using logical level its needs 4.5V, and normally its needs 10V?
Or you can using power plug and jack to do the job?
Or you can using power plug and jack to do the job?
Using a AON6411: http://www.aosmd.com/res/data_sheets/AON6411.pdf
Why not use a jack connection that switches from one source to the other?
http://www.mouser.com/ProductDetail...ZZMtnOp%2bbbqA00%2brH%2bGhOEZAaZ%2bd3EuAm0iY=
Use pin 1 as a common, pin 3 for your internal battery, and pin 2 to power your circuit.
http://www.mouser.com/ProductDetail...ZZMtnOp%2bbbqA00%2brH%2bGhOEZAaZ%2bd3EuAm0iY=
Use pin 1 as a common, pin 3 for your internal battery, and pin 2 to power your circuit.
Then wouldn't I be shorting out the internal battery when I want to open the circuit with the battery connects.
No, because the battery is disconnected from the circuit when the plug is inserted into the jack (which has your external power).
Ah, okay, I understand. The only jacks I've used previously were for guitar pedals which are used to disconnect the battery when the guitar cable isn't plugged in. Thanks, I'll try it.
