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TPS61086 compensation

Lucifer
Expert 2600 points

Dear Sir,

I am going design a boost circuit with high amount output capacitor (560uF), 

my specification:

vin=5v, vout =16v/300mA, cout 560uF, L=3.3uH

Rcomp calculated value=4977K, Ccomp=0.8nF

According to the datasheet the Rcomp & Ccomp shuld be  RCOMP < 120 kΩ and CCOMP> 820 pF,   in this case what amount of Rcomp should I choose?  or is it possible to use type III compensation? could you please give me some suggestion? Thanks.

  • 0
    TI__Mastermind 40080 points
    Hi,
    I guess you use a electrolytic capacitor in your design. This kind of capacitor has big ESR, and may leads to stability problem.
    So you must add a capacitor from the COMP to GND to generate a pole to compensate the zero.
    I suggest you let Rcomp=100K, Ccomp=1nF, and Cp=220p in your design. (Cp is added between COMP and GND)