At the mp3car.com forums, we have found a $35 55W DC-DC power supply to power a small motherboard. It's similar to a laptop's power supply in that the power brick provides a regulated 12VDC to the PS. The PS then creates the necessary 5VDC, but simply feeds the 12VDC straight through. That's where we need some help.
This will be used in cars, so the input voltage will be anything from 9-14.4VDC (with the car on and off). That means that if we hooked it directly to the alternator, and it was getting the full 14.4VDC, it would send that unregulated 14.4 voltage to the motherboard and hard drives. Not good.
So what we need is a way to provide 12VDC@5A to the PS *or* regulate the output to 12VDC@2A. It needs to have an input variance of 8-16VDC, and pretty durable. Anyone have a simple (the cheaper the better) circuit to do this?
Could this be modified to do what we need?
https://www.onsemi.com/pub/Collateral/AN954-D.PDF
Thanks.
This will be used in cars, so the input voltage will be anything from 9-14.4VDC (with the car on and off). That means that if we hooked it directly to the alternator, and it was getting the full 14.4VDC, it would send that unregulated 14.4 voltage to the motherboard and hard drives. Not good.
So what we need is a way to provide 12VDC@5A to the PS *or* regulate the output to 12VDC@2A. It needs to have an input variance of 8-16VDC, and pretty durable. Anyone have a simple (the cheaper the better) circuit to do this?
Could this be modified to do what we need?
https://www.onsemi.com/pub/Collateral/AN954-D.PDF
Thanks.