Other Parts Discussed in Thread: LM5143,
design parameter is:
VIN :12-24 Vout :-6V. Iout 20A.
use LM5143 with single output-2phase, is it right to caculate Frhp with a half Iout ?
with 
.
L set 8uh, Iout=10A. so Frhp=15.9Khz, Generally, the RHP frequency must be about 4 times the loop gain crossover frequency.
,so the crossover frequency is only can set 3.98K. is to small.
and how to caculate crossover frequency in IBB mode. the LM5143-Q1 Quickstart Tool - revA9 how to use caculate in IBB mode.
and caculate the Cin ,Cout is any difference in IBB MODE,in the datasheet didn't mentioned.
