Regulation Issue in multiple output

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Hi,

 

I have an issue with multiple output power supply using TOP switch JX series. The circuit is working fine i have an issue in regulation of all the three secondary outputs because the regulation is maintained only at one output of the secondary the remaining two outputs, output2 and output3 will be based on output1 regulation so i want to regulate all the three outputs through a feedback circuit because i want to use this powersupply for ADC sensing side. kindly let me know how can i regulate all the three outputs with single secondary feedback.

 

Regards,

 

Karimulla Baig.

Hi,

 

Cross regulation effect is  very common in fly-back topologies. Cross regulation effect can be minimised up to some extent by doing the following things

 

1. AC stacked windings and center tapping on the secondary of the transformer

2. Using weighted feedback method

 

Please have a look at one of the design example for reference

 

http://www.powerint.com/sites/default/files/PDFFiles/der299.pdf

 

Regards,

PI-NANO 

Dear NANO,

 

Thanks for your valuable response and precious time but in my secondary side all the three outputs are floating in a sense all the three output grounds are isolated with each other is it possible to regulate the all the three outputs with a common feedback circuit.

Kindly advise.

 

Regards,

Karimulla Baig

Dear,

 

Can any one response on my above issue which we are facing.

 

 

Regards,

 

Karimulla Baig

Hi,

I am not sure about the application where you are using this configuration and load on each output. But in your case it is better to regulate the main output with the feedback circuit and use the linear regulators to regulate all other outputs. Keep some preload on the main output so that you can have better control on other outputs when using linear regulators.

Regards,

PI-NANO