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L6983 Folha de dados(PDF) 27 Page - STMicroelectronics

Nome de Peças L6983
Descrição Electrónicos  38 V, 3 A synchronous step-down converter with 17 μA quiescent current
PDF  63 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6983 Folha de dados(HTML) 27 Page - STMicroelectronics

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mC=1+SeSn
Se=ISLOPE∙fSW
Sn=VIN−VOUT
L
(14)
FHs = 1
1+ sωn∙QP+s2ωn2
(15)
where:
QP= 1
π∙ mC∙ 1−D −0.5
(16)
7.2
Error amplifier compensation network
The following figure shows the typical compensation network required to stabilize the system.
Figure 24. Trans-conductance embedded error amplifier
VREF
FB
E/A
RC
CC
RC
CC
RO
CO
V
V
Gm dV
REF
FB
dV
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:
AOs =
AVO∙ 1+s∙RC∙CC
s2∙RO∙CO∙RC∙CC+s∙ RO∙CC+RO∙CO+RC∙CC +1
(17)
where:
AVO=Gm∙RO
(18)
The poles of this transfer function are (if CC >> CO):
L6983
Error amplifier compensation network
DS13116 - Rev 1
page 27/63



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