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SP7663 데이터시트(PDF) 13 Page - Sipex Corporation

부품명 SP7663
상세설명  Current Limiting using Inductor DCR
PDF  19 Pages
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제조업체  SIPEX [Sipex Corporation]
홈페이지  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7663 데이터시트(HTML) 13 Page - Sipex Corporation

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3
Nov3-06 Rev L
SP7663 Wide Input Voltage Range 6A, 600kHz Buck Regulator
© 2006 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)
Gan
(dB)
60kHz. The ESR zero is contributed by the
ESR associated with the output capacitors
andcanbedeterminedby:
ƒZ(ESR) =

2π• COut • ReSr
The next step is to calculate the complex
conjugate poles contributed by the LC
outputfilter,
ƒP(LC) =

2π•
√ L • COut
When the output capacitors are of a Ceramic
Type,theSP7663EvaluationBoardrequires
aTypeIIIcompensationcircuittogiveaphase
boostof80°inordertocounteracttheeffects
of an underdamped resonance of the output
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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