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UCC28070: Value of RSA and RSB

Jyoti Sabnis
Prodigy 70 points
Part Number: UCC28070

Hi,

In Application note of UCC28070 doc no SLUA479B , the calculation of RSA and RSB is as below-

I have two ques-

1) the value of Ipeak is wrong, it should be 5.1A however by putting 5.1A Ipeak in above formula we get around 32.5ohm resistor.

2) In above formula why they have considered 3.7V as Vs (Peak current limit voltage). In the datasheet of Ucc28070 the peak current limit threshold is 3.3V as shown below.

Please suggest what is the current value of Vs to be considered while sizing Rs .

We have not used current transformer in our design. we have used shunt resistor so the formula for RS modifies to-

Rs= (0.9*Vs)/ Ipeak. 

Regards,

Jyoti