I'm trying to design a DC to DC converter for use with a car battery of 12VDC to output 5VDC with 3.0A.
Could someone point me in the direction of a schematic or a general idea of what parts I should be using? I was thinking a LM7805 regulator would be a good start but I am an amateur and wondered if anyone had any better ideas?
NI is fine. But if you want to find a cheapter one, LM2575 might be your right choice. The useage is the same with 7805, but two or three cap/inductor inside as filter.
I used it couple of time in audio products.
if you not worry much about the noise, switching regular might be the other cheap choise. like: IT34063
The LM2575 is only good for 1A, the IT34063 can only do 1.5A, and you won't get 3A from a linear 7805 either [(12V-5V)*3A= 21watts that it would have to dissipate].
The LM2575 is only good for 1A, the IT34063 can only do 1.5A, and you won't get 3A from a linear 7805 either [(12V-5V)*3A= 21watts that it would have to dissipate].
Oh I was recommended that by a friend... I mean currently I have a circuit doing that job that I bought but I'm not entirely sure what it is other than it is 7 pin and uses the metal enclosure as a heat sink.
Oh I was recommended that by a friend... I mean currently I have a circuit doing that job that I bought but I'm not entirely sure what it is other than it is 7 pin and uses the metal enclosure as a heat sink.
Well what I require is a step down DC to DC converter that takes in a 12VDC input from a car battery and out puts 5VDC at 3A to power a portable video recording device. I've been researching it in terms of what parts because what I have is something that I payed a company to build me several years ago but they no lionger exist and I'd like to build my own for cheapness and ease of repair ect.
If efficiency isn't important then you could go with linear but I wouldn't recommend it for 24V, at which point a switching regulator probably becomes cheaper.
A linear regulator such as the LM7805 can be boosted to supply 3A.