Hi,
Based on the values of C5, C8 and R5, am I supposed to calculate f_comz, f_comp1, f_comp2?
Is it possible to show me the calculation formula on how to deduce the f_comz, f_comp1, f_comp2? I can't get the formula by equation 17 in the datasheet.
Thank you for your time.
Dear all,
Please use gm to replace GEA*REA .
And for this trans-conductance amplifier, the equation on the datasheet is not clear. Please use the following equation:
1). Control stage: Gc=gm*Zcomp --> Zcomp is the impedance of the compensation network. as C13 is much smaller than C8, so finally :
2) Power stage (Dm is duty, Rsense=0.08, Cototal is the effective output capacitance, Lm is the inductance)
3) Dividing network : Gdiv=Vref/Vo
Multiply equation (1), (2),(3) together, you can get the total loop gain.
So here, your interested formula is :
f_comz=1/(2ᴨR8C8),
f_comp1=1/(2ᴨR8C13),
f_comp1=1/(2ᴨReaC8),
the value of Rea is very big (5Mohm).
