參數(shù)資料
型號： SC4624
廠商： Semtech Corporation
英文描述： Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator
中文描述： 低輸入電壓，高效率及4A集成FET的同步降壓直流/直流穩(wěn)壓器
文件頁數(shù)： 15/20頁
文件大?。?/td> 738K
代理商： SC4624
15
2007 Semtech Corp.
www.semtech.com
SC4624
POWER MANAGEMENT
Application Information (Cont.)
where
)
C
C
(
R
1
2
1
7
I
+
=
ω
2
1
1
Z
C
R
1
=
ω
8
8
7
2
Z
C
)
R
R
(
1
+
=
ω
2
1
1
2
C
1
1
P
C
R
C
C
+
=
ω
9
8
8
2
P
C
R
1
=
ω
After the compensation, the converter will have the
following loop gain:
=
where
G
PWM
= PWM gain.
V
M
The design guidelines for the SC4624 applications are as
follows:
Set the loop gain crossover corner frequency
w
C
for
given switching corner frequency
w
= 2
p
fs,
Place an integrator at the origin to increase DC and
low frequency gains.
Select
w
and
w
such that they are placed near
w
O
to damp the peaking and the loop gain has a -20dB/
dec rate to go across the 0dB line for obtaining a wide
bandwidth.
Cancel the zero from C4’s ESR by a compensator pole
w
(
w
=
w
= 1/(R
C
)).
Place a high frequency compensator pole
w
(
w
=
p
fs) to get the maximum attenuation of the switch-
ing ripple and high frequency noise with the adequate
phase lag at
w
C
.
The compensated loop gain will be as given as show in
Figure 18.
Figure 18. Asymptotic Diagrams
of Power Stage and Loop Gain
1.
2.
3.
4.
5.
C
1
L
s
R
L
s
1
C
R
1
s
1
s
1
s
1
s
1
s
1
s
V
V
1
)
G
)
G
G
)
T
2
1
4
C
2
P
2
Z
1
P
1
Z
I
I
M
VD
COMP
PWM
+
+
+
w
+
w
+
w
+
w
+
w
=
=
C
1
L
s
R
L
s
1
C
R
1
s
1
s
1
s
1
s
1
s
1
s
V
V
1
)
G
)
2
1
4
C
2
P
2
Z
1
P
1
Z
I
I
M
VD
+
+
+
w
+
w
+
w
+
w
+
w
=
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SC4624_08 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator
SC4624A 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator
SC4624AEVB-MLPQ 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator
SC4624AMLTRT 功能描述:IC REG BUCK ADJ 4A 20MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:5 V ~ 25 V 輸入電壓:2.3 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):600kHz，1.2MHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:8-MSOP
SC4624EVB-MLPQ 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator
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