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參數(shù)資料
| 型號(hào)： | SC2441AEVB |
| 廠商： | Semtech Corporation |
| 英文描述： | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| 中文描述： | 1.8V至20V的輸入2相同步降壓與升壓轉(zhuǎn)換器控制器 |
| 文件頁(yè)數(shù)： | 23/37頁(yè) |
| 文件大?。?/td> | 1024K |
| 代理商： | SC2441AEVB |
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23
2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Applications Information
SC2441A
Loop Compensation for the Step-Up Converter
A simple small signal model for current-mode boost
converter in continuous-conduction mode is shown in
Figure 10.
Figure 10. Small signal model of Boost converter.
In Figure 10, C
and R
are the capacitance and the
ESR of the output capacitor, g
is the error amplifier
transconductance and k
is the current loop gain. If one
specifies the loop crossover frequency f
, the
compensation component values are readily calculated
as
,
R
5
R
R
f
2
1
|
f
f
1
|
2
R
)
D
1
3
k
g
h
C
3
o
3
esr
3
esr
c
1
z
c
3
o
3
3
m
3
4
)
2
R
R
(
C
C
1
R
3
o
3
esr
3
o
4
4
and
3
o
3
esr
4
5
R
R
2
C
C
.
L
2
R
)
D
1
f
3
3
o
2
3
1
z
b
a
b
3
R
R
R
h
Soft-Starting the Step-Down Controllers
The soft-start of the two step-down converters are
independently controlled through SS1 pin and SS2 pin.
As lillustrated in Figure 4, if V
is below 4.5V, Q
will be
on, keeping C
SS
discharged. When FAULT goes low, Q
is
turned off, C
gets charged via R
from V
CC
. Values of
R
SS
and C
SS
set different start-up times.
As shown in Figure 4, if the output falls below 70% of its
setpoint, the Css will be discharged with a 10
μ
A current
sink. R
must be large enough to allow the soft-start
capacitor to be discharged below 0.5V. Soft-start process
should be long enough to allow the output to reach 70%
of its final value before hiccup is armed.
Coincident Soft-Start
The step-down controllers can be made to start
coincidently. The method is shown in Figure 11.
SS1/EN1
SC2441A
3
SS2/EN2
17
R
SS1
C
SS1
R
SS2
C
SS2
V
CC
V
CC
D
1
D
2
C
SS
Figure 11. Coincident Soft-Start for Step-Down
Converters
The capacitance of C
than 3 times of the capacitance of the C
, as shown above, should be more
SS1
and C
SS2
.
b
a
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2441ATETRT | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441 | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441EVB | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ITSTRT | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2442 | High Performance Wide Input Range Dual Synchronous Buck Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC2441ATETRT | 制造商:Semtech Corporation 功能描述: |
| SC2441EVB | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
| SC2442 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442H | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
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