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ADP1048 shunt

Question asked by wulox on Apr 9, 2014
Latest reply on Apr 9, 2014 by wulox

Hello guys

 

i'm started to play with eval. board 600W pfc interleaved with ADP1048.

 

I have some questions about the dimensioning of R shunt to add in series of source mosfets and in series with pgnd.

 

The internal comparator said about of 2 threshold, 0.75V and 0.5V. But in this case i will to have a wery big power losses and dissipationd above the shunt if i calculete they for to obtain a big output power . ( example, 20A ac main, over a 750mV thresold is about 15W losses.....)

 

Now, is possible to change the tresholds? Is possible to add the gain at the current sense signal for use a litle shunt value? In the TRIM page of the GUI  i can adjust the gaind and offset for the CS+- stage,  is correct?

 

thank you

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