参数资料
型号: SC1485ITSTRT
厂商: Semtech
文件页数: 20/27页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM 28-TSSOP
标准包装: 1
PWM 型: 控制器
输出数: 2
占空比: 90%
电源电压: 1.8 V ~ 25 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: 28-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: SC1485ITSDKR
NOT RECOMMENDED FOR NEW DESIGN
SC1485
POWER MANAGEMENT
Next, looking at the power section, the schematic in Figure 12 below shows the power section and input loop for
OUT2:
2
3
4
C14
C13
VBAT
C12
8
7
6
5
Q3 IRF7811AV
1
D S
D S
D S
D G
L2
2u2
VOUT2
G
D
S
D
S
D
10u/25V
1210
0u1/25V
0603
2n2/50V
0402
4
3
2
1
Q4 FDS6676S
5
6
7
8
S D
R12 0R (2)
+
C16
220u/25m
7343
+
C17
220u/25m
7343
0402
Figure 12: Power Section and Input Loop
The schematic has been redrawn to emphasize the input loop. The highest di/dts occur in the input loops and thus
these should be kept as small as possible. 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. Exactly the
same philosophy applies to the OUT1 power section and input loop. Figure 13 below shows an example of the layout
for the power section using these guidelines.
Figure 13: Power Component Placement and Copper Pours
? 2005 Semtech Corp.
20
www.semtech.com
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