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DC-DC开关电源设计指南
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2010-07-09
14:15:38
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MAXIM公司的DC-DC开关电源设计培训教程,包括开关电源拓扑结构、器件选择、PCB布局和布线、开关电源效率和EMI考虑几方面内容
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DC/DC Switching Regulator
Design Consideration
Brad Xiao
SPM BU, Maxim China
July 2010
2
2
¾Switching Regulator Topologies
¾Components Selection Considerations
¾PCB Placement & Layout
¾DC/DC Switching Regulator Verification
¾EMI Considerations
DC/DC Switching Regulator Design Consideration
3
3
¾Switching Regulator Topologies
¾Components Selection Considerations
¾PCB Placement & Layout
¾DC/DC Switching Regulator Verification
¾EMI Considerations
DC/DC Switching Regulator Design Consideration
4
4
Non-Isolated Switching Regulator - Buck
DC/DC Switching Regulator Design Consideration
Vgs-Q1
Vds-Q1
Vd-D1
V
Lf
iLf
Iout
Vin
Vin
Vin-Vout
-Vout
I
Lf-max
ILf-min
ΔILf
Ton Toff
CCM (Iout ≥ ΔILf/2)
VLf = Vin – Vout = Lf *
Δ
ILf / D*T
V
Lf = -Vout = -Lf *
Δ
ILf / [(1-D) * T ]
(Vin – Vout) * D*T = Vout (1-D)* T
Vout = D * Vin
Ton:
Toff:
Q1 ON
Q1 OFF
5
5
Non-Isolated Switching Regulator - Buck
DC/DC Switching Regulator Design Consideration
DCM (Iout < ΔILf/2)
Q1 ON
Q1 OFF
6
6
Non-Isolated Switching Regulator - Buck
DC/DC Switching Regulator Design Consideration
In high current applications, to increase the
efficiency, the diode is replaced with a MOSFET,
which is named synchronous rectifier Buck converter
Vgs-Q1
Vgs-Q2
Dead
time
Vout = D * Vin
7
7
D
Vin
Vout
−
=
1
VinVout >
In the Steady State: The volt-second
of the inductor are the same.
Δ
IL1
D*T
(1-D)*T
T
Δ
IL2
VL = Vin = Lf *
Δ
IL1 / D*T
VL = Vout – Vin=Lf*
Δ
IL2 / [(1-D)*T ]
Vin * D*T = (Vout - Vin) * (1-D)* T Vout = Vin / (1-D)
Non-Isolated Switching Regulator - Boost
DC/DC Switching Regulator Design Consideration
8
8
D
VinD
Vout
−
⋅
−=
1
VinVout
VinVout
<
>
OR
In the Steady State: The volt-second
of the inductor are the same.
Δ
IL1
D*T
(1-D)*T
T
Δ
IL2
VL = Vin = L *
Δ
IL1 / D*T
VL = - Vout = - L*
Δ
IL2 / [(1-D)*T ]
Vin * D*T = - Vout * (1-D)* T Vout = - D * Vin / (1-D)
Non-Isolated Switching Regulator - Buck/Boost
DC/DC Switching Regulator Design Consideration
9
9
Non-Isolated Switching Regulator Summary
Buck, boost, and buck-boost regulators are the
variations of three-element cell (active switch,
passive switch, and inductor).
OUTIN
OUTIN
OUTIN
DC/DC Switching Regulator Design Consideration
10
10
Switching Regulator Topologies
How to select a suitable topology
For Non-Isolated application, select a suitable
topology based on the relationship of input voltage
and output voltage
Vout = - D * Vin / ( 1 – D )Buck/Boost
Vout = Vin / ( 1 – D )Boost
Vout = D * VinBuck
DC/DC Switching Regulator Design Consideration
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