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L6986H Folha de dados(PDF) 36 Page - STMicroelectronics

Nome de Peças L6986H
Descrição Electrónicos  38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current
PDF  68 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986H Folha de dados(HTML) 36 Page - STMicroelectronics

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The sampling effect contribution FH(s) is: FH(s)= 1
1+ s
ωn⋅Qp+S2ωn2
(22)
where:
ωn=π⋅fSW
Qp= 1
π⋅[mc⋅(1−D)−0.5]
(23)
5.2
Error amplifier compensation network
The typical compensation network required to stabilize the system is shown in Figure 36. Transconductance
embedded error amplifier:
Figure 36. 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:
A0(s)=
AV0⋅(1+s⋅RC⋅Cc)
s2⋅R0⋅(C0+Cp)⋅RC⋅Cc+s⋅(R0⋅Cc+R0⋅(C0+Cp)+Rc⋅Cc)+1
(24)
Where Avo = Gm · Ro
The poles of this transfer function are (if Cc >> C0 + CP):
fPLF= 1
2⋅π⋅R0⋅Cc
(25)
fPHF= 1
2⋅π⋅R0⋅(C0+Cp)
(26)
L6986H
Error amplifier compensation network
DS12905 - Rev 2
page 36/68



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