6V battery to +12V/300mA, -12V/300mA and +5V/2A DC-DC converter circuit

[Jestin_cubetech]

how can i design a LM2577-ADJ Fly-back Regulator for
6V battery to +12V/300mA, -12V/300mA and +5V/2A.



5v to +12V/300mA, -12V/300mA




i am trying to design 3 output power supply using single LM2577.

Any suggestions are greatly appreciated..

 

[smijesh]

You can’t make the circuit with your specification.
For your requirement you need to drive 19VA (17.2VA in secondary) in the primary side with 6V. So the switching current will be 3.2A. It will exceed the current limit of the controller.

 

[Jestin_cubetech]

thank you smijesh
what about 12v battery ?

 

[smijesh]

As per data sheet it will work.
Select transformer with primary inductance of 30 to 40uH and ratio of 1:1:0.5,
Put a heat sink for IC,
5V out should not be a regulated one.