Could you please this explain a bit more...I would look at deriving a power rail between your ground and -48V say at around -12V, using a zener or a 3 terminal linear regulator to power your PWM chip.
-48 volt is the telephone line voltage. I hope you do NOT waste time believing that you can take 1.5 A from a telephone line. The only outcome will be that your telephone line will be disconnected and some really grumpy people from the telephone company will knock on your door.Hi,
I need a circuit for converting -48V DC to 24V DC capable of 1.5A output.
I search the net for a while but nothing found. Can you guys help me out.
Thanks,
I'll draw you a little schematic of what I mean after work. t06afre raises a very good point, what is your application?Thanks RmACK!,
Could you please this explain a bit more...
Try registering with http://www.national.com/analog and using their online designer.RmACK, Thanks for u reply.
I looked into buck-boost converter. Its seems to solve my problem!
But could you suggest any IC with my required Input and Output range?
I just now finished my B.E.
I've attached a schematic for both the zener and 3-terminal regulator approaches I mentioned for creating a floating -12V rail for your PWM chip to run from. R1 has 36V across it and needs to have its resistance chosen such that more current flows through it than your 12V circuitry needs. You must then choose the power rating of R1 to be able to handle this current.Thanks RmACK!,
Could you please this explain a bit more...
by Jake Hertz
by Jake Hertz
by Aaron Carman