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Unstable flyback SMPS

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grizedale

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Hello,

I am trying to stabilise the isolated output voltage of this flyback converter.

SCHEMATIC
http://i54.tinypic.com/3162lpw.jpg

It is 5V, 20W at the output.
(Its in CCM)
(it has been arranged to be in Voltage Mode, by a ramp being interfaced to the current sense input of the LT1243)

The input voltage will be 30V to 48V

I can’t seem to stabilise it, and it takes a long time to run.

Can you please help me to get it to run quicker so that I can adjust the feedback components and see if it stabilises?

or help me with stabilisation?


LTSpice simulation file:-

2shared - download flyback 5v _30-48Vin.asc

LTSpice free download page:
Linear]Linear Technology - Design Simulation and Device Models Technology - Design Simulation and Device Models
 
Last edited:

grizedale

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Hi

sorry, i had made a mistake with connection
-the problem is solved
 

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