参数资料
型号: SC470ITSTRT
厂商: Semtech
文件页数: 19/31页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM 14-TSSOP
标准包装: 1
PWM 型: 控制器
输出数: 1
电源电压: 5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 14-TSSOP(0.173",4.40mm 宽)
包装: 标准包装
产品目录页面: 1358 (CN2011-ZH PDF)
其它名称: SC470ITSDKR
NOT RECOMMENDED FOR NEW DESIGN
POWER MANAGEMENT
Application Information (Cont.)
As shown below, VOUT and VSSA should be routed as a differential pair to the output capacitor(s).
SC470
1
2
U2
EN/PSV
TON
SC470
BST
DH
14
13
VOUT
3
VOUT
LX
12
C6
56p
0402
R4
20k0
0402
4
5
6
VCCA
FB
PGD
ILIM
VDDP
DL
11
10
9
R12 0R (2)
0402
+
C14
220u/25m
7343
+
VOUT
C7
220u/25m
7343
R8
20k0
0402
C11
7
VSSA
PGND
8
1uF
0603
VSSA
VOUT
Figure 11: Differential Routing of Feedback and Ground Reference Traces
Next, the schematic in Figure 12 below shows the power section. The highest di/dts occur in the input loop (highlighted
in red) and thus this loop should be kept as small as possible.
VBAT
Q1
IRF7811AV
C2
2n2/50V
0402
L1
2u2
C3
0u1/25V
0603
C4
10u/25V
1210
VOUT
+
C6
+
C7
Q2
FDS6676S
R6
0R (2)
220u/25m
7343
220u/25m
7343
0402
Figure 12: Power Section and Input Loop
The input capacitors should be placed with the highest frequency capacitors closest to the loop to reduce EMI. Use
large copper pours to minimize losses and parasitics. See Figure 13 on Page 20 for an example.
? 2005 Semtech Corp.
19
www.semtech.com
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