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Voltage mode isolated flyback with LNK457D ?

Posted by: lighter on

Hallo,

Is it possible to use LNK457D to make a Voltage mode application. (I don't need of a strong voltage tolerance)?

If I use a non isolated secondary for feedback, is it possible to use this device in isolated flyback to make that voltage?

In other words i need a isolated voltage power using LNK457D 

Is it also possible to stop, and tied the device stopped, putting a resistor between BP and FB while running?

Thank you in advance

Lighter

评论

Submitted by PI-Jono on 06/25/2013

Hi,

FB pin voltage is only 290mV which is ideal and designed for sensing current. If we are going to use this as a voltage sensing, the tolerance of the output voltage will be big.  Therefore, LNK457DG is impractical to use for isolated voltage.

Yes, it is possible to stoped switching if you pulled FB pin above 520mV.

Regards,

PI-Jono