参数资料
型号: SC2608BSTRT
厂商: Semtech
文件页数: 8/12页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 8-SOIC
标准包装: 1
PWM 型: 电压模式
输出数: 1
频率 - 最大: 275kHz
占空比: 90%
电源电压: 4 V ~ 14 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 85°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 标准包装
其它名称: SC2608BSDKR
SC2608B
POWER MANAGEMENT
Applications Information (Cont.)
(5) The compensation capacitor is determined by choos-
ing the compensator zero to be about one fifth of the
An example is given below to demonstrate the proce-
dure introduced above.
=
F zero
output filter corner frequency:
F o
5
V in =12V
V o =2.5V
I o =15A
C o =4400uF
R c =0.009 ?
V bg =0.8V
C =
1
2 π R ? F zero
F sw =250KHz
L=2.2uH
V ramp =1V
G m =0.007A/V
C i =1nF
SC2608B soft start time is determined by  the
compensation capacitor. Capacitance can be adjusted
to satisfy the soft start requirement.
(6) The final step is to generate the Bode plot by using
the simulation model in Fig. 4 or using the equations pro-
set
R c =1.33K ? set to R c =1.5K ?
C=327.95nF set to C=100nF
for suitable soft start time
vided here with Mathcad. The phase margin can then be
checked using the Bode plot.
Loop Gain Mag (dB)
100
50
mag ( i )
0
50
10
100
1 . 10
3
1 . 10
4
1 . 10
5
1 . 10
6
F i
Loop Gain Phase (Degree)
0
45
phase ( i )
90
135
1 . 10
1 . 10
180
10
100
1 . 10
3
4
5
1 . 10
6
F i
Fig. 5. Bode plot of the loop
? 2007 Semtech Corp.
8
www.semtech.com
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