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參數(shù)資料
| 型號： | SC483ITSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| 中文描述： | 雙同步降壓偽固定頻率電源控制器 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 478K |
| 代理商： | SC483ITSTRT |
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17
2005 Semtech Corp.
www.semtech.com
SC483
POWER MANAGEMENT
The layout can be considered in two parts, the control section referenced to VSSA1/2 and the power section.
Looking at the control section first, locate all components referenced to VSSA1/2 on the schematic and place
these components at the chip. Connect VSSA1 and VSSA2 using either a wide (>0.020”) trace. Very little current
flows in the chip ground therefore large areas of copper are not needed.
R8
10R
0402
0402
0402
0402
C15
56p
0402
0402
0603
0603
VOUT2
EN/PSV1
22
TON1
23
VOUT1
24
VCCA1
25
FB1
26
PGD1
27
VSSA1
28
PGND1
1
DL1
2
VDDP1
3
ILIM1
4
LX1
5
DH1
6
BST1
7
EN/PSV2
8
TON2
9
VOUT2
10
VCCA2
11
FB2
12
PGD2
13
VSSA2
14
PGND2
15
DL2
16
VDDP2
17
ILIM2
18
LX2
19
DH2
20
BST2
21
U1
SC483
C9
1uF
0603
R4
0402
R3
0402
VOUT1
VBAT
C4
1nF
0402
R1
0402
PGOOD
5VSUS
C10
1uF
0603
5VSUS
R2
10R
0402
C7
0402
VSSA2
VSSA1
C19
1uF
R9
20k0
R13
20k0
C18
1nF
5VSUS
R7
1M
VBAT
PGOOD
C20
1uF
5VSUS
Figure 9: Components Connected to VSSA1 and VSSA2
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