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SP7661 数据表(PDF) 13 Page - Sipex Corporation

部件名 SP7661
功能描述  Wide Input Voltage Range 3A, 600kHz, Buck Regulator
PDF  20 Pages
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制造商  SIPEX [Sipex Corporation]
网页  http://www.sipex.com
标志 SIPEX - Sipex Corporation

SP7661 数据表(HTML) 13 Page - Sipex Corporation

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3
Mar -07 Rev N
SP766 Wide Input Voltage Range 3A, 600kHz Buck Regulator
© 2007 Sipex Corporation
Bode Plot of Type III Error Amplifier Compensation.
Frequency
(Hz)
Error Amplifier
Gain Bandwidth Product
Condition:
C22 >> CP1, R1 >> RZ3
20 Log (RZ2/R1)
Gain
(dB)
120kHz.TheESRzeroiscontributedbythe
ESRassociatedwiththeoutputcapacitors
andcanbedeterminedby:
ƒz(ESR) =

2π• COut • ReSr
Thenextstepistocalculatethecomplex
conjugate poles contributed by the LC
outputfilter,
ƒP(LC) = .

2π•
√L• COut
WhentheoutputcapacitorsareofaCeramic
Type,theSP7661EvaluationBoardrequires
aTypeIIIcompensationcircuittogiveaphase
boostof180°inordertocounteracttheeffects
ofanunderdampedresonanceoftheoutput
filteratthedoublepolefrequency.
CP1
RZ2
CZ2
-
+
VFB
COMP
+
- 0.8V
CF1
VOUT
R1
68.1kΩ, 1%
RSET
CZ3
RZ3
RSET =
54.48 (kΩ)
(VOUT -0.8)
Type III Error Amplifier Compensation Circuit
APPLICATIONS INFORMATION



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