Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] 48 volts to 12 volts Regulator

Status
Not open for further replies.
sribangaram

sribangaram

Full Member level 5
Joined
Apr 29, 2012
Messages
297
Helped
7
Reputation
14
Reaction score
7
Trophy points
1,298
Location
INDIA.:/;:'" VIJAYAWADA
Activity points
3,754
Please tell me any body which regulator was use for 48 volts to 12 volts converting
LM 7812 supported or not :?::roll: tell me as soon as possible
 

I advice you to used bulk converter for 48v-12v it would be safer.
 

sribangaram said:
Dear Friend I am sorry what is bulk converter:?:
Click to expand...

He meant BUCK converter ... I think ...

LM7812 is useless in this application. First of all, its max input voltage is around 30V, and second, the heat generated in linear conversion is proportionl to the load current x [Vin-12V] ...
Go for a switching step-down converter, and you will need a high-voltage version.
One option is the LM2575-HV:
**broken link removed**

:wink:
IanP
 
untuk audio amp......:)
 

How much current does it have to supply?

e.g. if it's 12V for an op-amp which only draws 1mA, there's simpler and cheaper ways of doing it than a switch mode module.
 

Yes you are right,you can used resistor and zenar diode as voltage regulator it works.
 

If I wanted a good quality, low current 12V rail, I'd use a series resistor, a zener and cheap 78L12 regulator.

The 78L12 has Vi(max) of 35V. So use the series-R and (e.g.) an 18V zener as an 18V-ish pre-regulator which supplies the 78L12 input. Put decoupling caps on the 78L12 input and output and you get the benefits of its accuracy, stability, load regulation etc.

As we all know, the circuit required depends on what you're trying to do exactly :)
 

Oh good, glad you're happy :)
 

Take a look at these chips if you need more current:

L4970 - 10A
L4971 - 5A
L4972 - 2A
L4973 - 3.5A
L4975 - 5A
 

For more current you can also use a simple regulator and a high power transistor in a common-collector setup.
 

Baas Rietrot said:
For more current you can also use a simple regulator and a high power transistor in a common-collector setup.
Click to expand...

To do that you have to look into the datasheet of the component you are to used
 

TonyM said:
How much current does it have to supply?

e.g. if it's 12V for an op-amp which only draws 1mA, there's simpler and cheaper ways of doing it than a switch mode module.
Click to expand...

Since the required current is so low, why not only a zener diode with series resistance?

- - - Updated - - -

Sorry, Actual power requirement not known. TonyM was giving an example!

@sribangaram, you have not mentioned your power requirement
 
Last edited:

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top