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A6986ITR bảng dữ liệu(PDF) 25 Page - STMicroelectronics

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A6986ITR bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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Sn represents the on-time slope of the sensed inductor current, Se the on-time slope of the external ramp (VPP
peak-to-peak amplitude) that implements the slope compensation to avoid sub-harmonic oscillations at duty cycle
over 50%.
Se can be calculated from the parameter VPP × gCS given in Section 3 .
The sampling effect contribution FH(s) is:
FHs= 1
1+ s
ωn∙Qp+s2ωn2
(11)
where
ωn=π∙fSW
Qp= 1
π∙mC∙ 1−D −0.5
(12)
6.2
Error amplifier compensation network
The typical compensation network required to stabilize the system is shown in the figure below:
Figure 27. Transconductance embedded error amplifier
RC and CC introduce a pole and a zero in the open loop gain. CP does not significantly affect system stability but it
is useful to reduce the noise at the output of the error amplifier.
The transfer function of the error amplifier and its compensation network is:
A0s=
AV0∙1+s∙RC∙CC
s2∙R0∙C0+Cp∙RC∙CC+s∙R0∙CC+R0∙C0+Cp+RC∙CC+1
(13)
where
AV0=Gm∙R0.
The poles of this transfer function are (if CC >> C0 + CP)
fPHF= 12∙π∙R0∙CC
(14)
A6986I
Error amplifier compensation network
DS13481 - Rev 2
page 25/62



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