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L6983IQTR Arkusz danych(PDF) 28 Page - STMicroelectronics

Numer części L6983IQTR
Szczegółowy opis  38 V, 10 W synchronous iso-buck converter for isolated applications
PDF  56 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6983IQTR Arkusz danych(HTML) 28 Page - STMicroelectronics

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mC=1+SeSnSe=VPP∙gCS∙fSW
Sn=VIN−VOUTL
(8)
Where ISLOPE is equal to 1 [A].
Sn represents the on-time slope of the sensed inductor current, Se the on-time slope of the external ramp that
implements the slope compensation to avoid sub-harmonic oscillations at duty cycle over 50%.
The sampling effect contribution FH(s) is:
FHs= 1
1+ s
ωn∙Qp+s2ωn2
(9)
where
QP= 1
π∙ mC∙ 1−D −0.5
(10)
8.2
Error amplifier compensation network
The following figure shows the typical compensation network required to stabilize the system.
Figure 35. Transconductance embedded error amplifier
RC and CC introduce a pole and a zero in the open loop gain. The transfer function of the error amplifier and its
compensation network is:
L6983I
Error amplifier compensation network
DS14040 - Rev 1
page 28/56



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