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help in boost DC to DC converter

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boost dc-1216

hi,I am doing a project on boost DC to DC ,Vin=2.8V--5.5V, Vout=10V Imax=250mA
my question is about slope compensation.
m1=vin/L ,-m2=(vout-vin+Vd)/L ,vin is not constant,so how to compensate the circuit to cancel the sub-H osc? (Vd is the voltage cross the schottky diode)
in buck ,ma>=1/2 m2, how to set ma in my design?

another question:
how to design a V to I converter in the slope compensation circuit?

can anybody give me some suggestion?
 

boost:
worst case occurs @ maximum vout/vin,
ie @max. output mimum input situation
in Robert W. Erickson book "Fundamentals of Power Electronics" fomula(12.25)
x=(m2-ma)/(m1+ma)= (y-a)/(1+a) <1
if a>(y-1)/2 (where y=m2/m1, a=ma/m1,)
the fomula can determine min. slop u need.
2.
u can ref. the paper
"A 1-V Integrated Current-Mode Boost Converter in Standard 3.3/5-V CMOS Technologies" ,Philip K. T. Mok, but, the paper focus on low voltage solution,
so, you may be have better solution for V-I converter..
if helpful,pls let me know!!
 

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