TopSwitch with non-isolated output, control input fed from output voltage

Posted by: mike4321 on 10/05/2012

Hi ,the application is a battery charging circuit to charge an internal battery (12V, 2A). Therefore there is no insulation of the output voltage required. In order to simplify the design (and most important, reduce the cost), is it possible to eliminate the transformer's bias winding and feed the control pin from the output voltage ?

Is there any application available without the bias winding ?

Thank you, Klaus

Files

Attachment	Size
TOPSwitch-JX_PIDesign_12V_2A.uds	249.5 KB

Comments

Hi,

Yes, you can use the output voltage instead of bias voltage for feeding into the C pin and use a transistor circuit instead of opto-coupler.

rgds..

Do you have an example schematic of such a design?

Thanks for posting your question into forum, We really apologize for delayed response.
The TopSwitch regulates the output voltages using the Control Pin Current. Please see the below link for Such design:
http://ac-dc.power.com/design-support/reference-designs/design-examples…
In this design , we were using DPA Switch. use that as an example to design for your specification.

Regards,
PI-KSAN