Negative power supply , high current

Thread Starter

karas

Joined Sep 8, 2011
209
i need to get -12vdc , 1A and my input is 36vdc+-10% , i do not need to use the module , because it is expensive, and i am trying to use buck-boost and i need suggestions about IC to control my circuit
 

dl324

Joined Mar 30, 2015
10,072
There is a wide variety of switching regulators that will do it.

What is the current capacity of the power source?
 

bushrat

Joined Nov 29, 2014
209
my input is positive not negative , so u can not use it
Is it possible to use 7812 and reverse connections? Output from 7812 to be used as 0V and the ground to be used as -12V? Similar to measuring positive voltage with multimeter leads reversed..
 

MrChips

Joined Oct 2, 2009
20,289
Is it possible to use 7812 and reverse connections? Output from 7812 to be used as 0V and the ground to be used as -12V? Similar to measuring positive voltage with multimeter leads reversed..
Not if the positive source power supply is referenced to 0V.

@karas One solution is to use a buck converter to supply the -12V directly.
Another solution is to build an oscillator, rectify and convert to about -15VDC and then use a 7912 three-terminal regulator.
 

MrChips

Joined Oct 2, 2009
20,289

Thread Starter

karas

Joined Sep 8, 2011
209
Not if the positive source power supply is referenced to 0V.

@karas One solution is to use a buck converter to supply the -12V directly.
Another solution is to build an oscillator, rectify and convert to about -15VDC and then use a 7912 three-terminal regulator.
You mean buck boost converter and for the oscillator you have to use transformer and this a lot
 

AnalogKid

Joined Aug 1, 2013
8,310
Is it possible to use 7812 and reverse connections? Output from 7812 to be used as 0V and the ground to be used as -12V? .
No. Sketch it out, keeping in mind that there is no energy storage in a linear regulator. What pushes the ground pin down to -12 V? Also, with the input at +36 V, that'w 48 V between the regulator's input and GND pins, way outside it's spec.

ak
 
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