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TPS54240: How to set the two external resistors for EN pin

Part Number: TPS54240
Other Parts Discussed in Thread: TEST

about equation 2 & 3 of page 15 of TPS54240 datasheet

R1=(Vstart-Vstop)/Ihys

R2=Vena/((Vstart-Vena)/R1+I1)

Q1:

What is Vstart, Vstop and Vena?

Q2:

If I want to design a power application about 37V~40V input and 34V 1A output. How to set the two external resistors for EN pin?

Peter