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參數(shù)資料
| 型號： | SC2441ATETRT |
| 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 |
| 文件頁數(shù)： | 33/37頁 |
| 文件大?。?/td> | 1024K |
| 代理商： | SC2441ATETRT |
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33
2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Applications Information
SC2441A
The inner current-loop is unstable (sub-harmonic
oscillation) unless the inductor current up-slope is steeper
than the inductor current down-slope. For stable
operation above 50% duty-cycle, a compensation ramp
is added to the sensed-current. In the SC2441A the
compensation ramp is made duty-ratio dependent. The
compensation ramp is approximately
D
0.734
SLOPE
V
e
D
230mV
(D)
D is the duty ratio.
The slope compensation voltage vs duty ratio is as shown
in Figure 22.
Figure 22. Slope Compensation Voltage Waveform
Illustrated as the picture above, as the duty ratio
increases, the slope compensation voltage added into
the control loop increases too. And the control loop
including the slope compensation is shown in Figure 23.
The voltage transconductance error amplifier (shown in
Figure 24) has a g
m
of 315
μ
A/V. C2, C3 and R2 construct
the compensation network for stable operation with
optimized load transient response.
The feedback gain h and the resistor values are
determined using the equations given in the “Setting the
Output Voltage” section with
.
V
5
h
o
Slope Compensation
Voltage
CS+
CS-
+
-
++
x 29
-
+
0.5V
FB
V
BE
+1.13V
+ -
Compensation
Network
Comp
+
-
PWM
EA
Figure 23. Control Flow Chart with Slope
Compensation
k
Figure 24. A simple model of current-mode buck
converter
For the rated output current I
o
, the first-order gain k is
determined as
.
V
I
k
c
o
k is the product of equivalent current sensing Rs and
current amplifier gain Gca=29. Furthermore the transfer
0.0
0.1
0.2
0.3
0.4
0.5
0.0
0.2
0.4
0.6
0.8
1.0
Duty Ratio (D)
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| SC2442H | 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 |
|---|---|
| SC2441EVB | 制造商:SEMTECH 制造商全稱: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: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:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442HITSTR | 制造商:Semtech Corporation 功能描述: |
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