how can i get -5v switching supply

[manju_gowda]

Hi all,
i need to generate -5V switching voltage from +5V input voltage so can anyone suggest me some circuit to achieve this.




Thanks & Regards,
Manjunath

 

[MikeMl]

How much current?

 

[alec_t]

How about this ?

 

[Wade Hassler]

If you just want the voltage and don't want to design it, try this device.
... trouble-free and relatively cheap.

 

[manju_gowda]

Need current of 1A .

 

[ronsimpson]

This one is only good for 300mA but shows what needs done. There are examples in the data sheet for +5 to -5.

Also see LM2611

 

[simonbramble]

Ron's circuit is a Cuk Converter. Read all about it:
http://www.simonbramble.co.uk/dc_dc...erter/inverting_dc_to_dc_converter_design.htm

 

[ronsimpson]

From the data sheet BUT:
This circuit was designed to operate as shown in black below. I changed it. See the output goes to ground. And GND is now -5V (the new output) As it tries to lift ground it will push -5V down. The FB pin looks at (-5V and GROUND) and will stop when the output is -5V.