I am wondering if anyone has come across any reviews or has any knowledge of automotive usb chargers / power supplies. I'm looking for specifics on voltage ripple and the like. Would one that's designed to run something that doesn't use a battery be any better that one that's designed to be used as a charger?
I have hacked a few for some projects so far and have noticed differences... the one Motorolla charger I've been using has two inductors as opposed to the one from Wal Mart that only has one. My knowledge of switch mode power supplies is pretty fundamental, but due to what I've read I assume the two are better than one. I don't have access to a scope so I thought I would see if anyone has actually looked into this or not. I do know for a fact the A/D converter on the PIC I'm using seems to like the Motorolla version over the other one. The values seem to hold steady with the Motorolla whereas they seem to fluctuate when powered with the other one.
I'm working on a few gizmos to make work and life easier that need to be portable and easily powered. I've considered making it battery powered, but since my gizmo will either be near truck or a battery already it would be smarter to use a converter. Roughly calculated I'll be drawing just under one amp. I'll be using a two amp converter to have the extra capacity available and to allow for a margin of safety.
I know I may be looking for a simple answer to something that doesn't have a simple answer. I'm better at trial and error than my wallet is so any ideas will be appreciated.
Thanks in advance.
I have hacked a few for some projects so far and have noticed differences... the one Motorolla charger I've been using has two inductors as opposed to the one from Wal Mart that only has one. My knowledge of switch mode power supplies is pretty fundamental, but due to what I've read I assume the two are better than one. I don't have access to a scope so I thought I would see if anyone has actually looked into this or not. I do know for a fact the A/D converter on the PIC I'm using seems to like the Motorolla version over the other one. The values seem to hold steady with the Motorolla whereas they seem to fluctuate when powered with the other one.
I'm working on a few gizmos to make work and life easier that need to be portable and easily powered. I've considered making it battery powered, but since my gizmo will either be near truck or a battery already it would be smarter to use a converter. Roughly calculated I'll be drawing just under one amp. I'll be using a two amp converter to have the extra capacity available and to allow for a margin of safety.
I know I may be looking for a simple answer to something that doesn't have a simple answer. I'm better at trial and error than my wallet is so any ideas will be appreciated.
Thanks in advance.