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参数资料
| 型号： | SC1403ITSTRT |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 380 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | LEAD FREE, MO-153AE, TSSOP-28 |
| 文件页数： | 6/31页 |
| 文件大小： | 590K |
| 代理商： | SC1403ITSTRT |
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14
2004 Semtech Corp.
SC1403
PRELIMINARY
POWER MANAGEMENT
United States Patent No. 6,377,032
www.semtech.com
Designing the Loop
There are two aspects concerning the loop design. One is the
power train design and the other is the external compensation
design. A good loop design is a combination of the two. In the
SC1403, the control-to-output/power train response is dominated
by the load impedance, the effective current sense resistor, out-
put capacitance, and the ESR of the output caps. The low fre-
quency gain is dominated by the output load impedance and the
effective current sense resistor. Inherent to Virtual Current SenseTM,
there is one additional low frequency pole sitting between 100Hz
and 1kHz and a zero between 15kHz and 25kHz. To compensate
for the SC1403 is easy since the output of error amplifier COMP
pin is available for external compensation. A traditional pole-zero-
pole compensation is not necessary in the design using SC1403.
To ensure high phase margin at crossover frequency while mini-
mizing the component count, a simple high frequency pole is usu-
ally sufficient. In the reference design below, single-pole compen-
sation method is demonstrated. And the loop measurement re-
sults are compared to those obtained from the simulation model.
Transient response is also done to validate the model. Also, to
help speed up the design process, a list of recommended output
caps vs compensation caps value is given in table I.
Single-Pole Compensation Method
Given parameters:
Vin = 19V, Vout = 3.3V @ 2.2A,
Output impedance, Ro = 3.3V/2.2A = 1.5 ,
Panasonic SP cap, Co = 180uF, Resr = 15
m ,
Output inductor, Lo = 4.7uH
Switching frequency, Fs = 300kHz
Simulated Control-to-Output gain & phase response (up to
100kHz) is plotted below.
-50
-40
-30
-20
-10
0
10
20
30
40
50
100
1000
10000
100000
f (Hz)
Ga
in
(d
B)
-200
-150
-100
-50
0
50
100
150
200
100
1000
10000
100000
f (Hz)
Ph
as
e(
deg
)
Measured Control-to-Output gain & phase response (up to
100kHz) is plotted below.
-50
-40
-30
-20
-10
0
10
20
30
40
50
100
1000
10000
100000
f (Hz)
Ga
in
(d
B)
-200
-150
-100
-50
0
50
100
150
200
100
1000
10000
100000
f (Hz)
Ph
as
e(
deg
)
Single-pole compensation of the error amplifier is achieved by
connecting a 100pF capacitor from the COMP pin of the SC1403
to ground. The simulated feedback gain & phase response (up to
100kHz) is plotted below.
Applications Information (Cont.)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC1404 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:移动多输出PWM控制器用虚拟当前SenseTM |
| SC1404_05 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1404ISSTR | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1404ITSTR | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1405 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:HIGH SPEED SYNCHRONOUS POWER MOSFET SMART DRIVER |
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