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參數(shù)資料
| 型號： | TPS65251RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數(shù)： | 14/31頁 |
| 文件大?。?/td> | 1827K |
| 代理商： | TPS65251RHAT |
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TPS65251
GND
VIN
LX3
VIN
LX3
GND
BST3
VIN3
EN3
F
B
1
S
1
S
Y
N
C
M
P
1
R
O
S
C
R
L
IM
1
C
M
P
3
R
L
IM
3
F
B
3
S
3
LX2
BST2
LX1
VIN2
LX2
EN2
VIN1
EN1
LX1
BST1
C
M
P
2
G
N
D
F
B
2
L
O
W
_
P
S
2
V
7
V
A
G
N
D
P
G
O
D
V
3
V
C11
22uF
R10
40.2K
R11
80.6K
1.2V 3A
L1
4.7uH
C13
4.7nF
R13
100K
C15
100pF
R12
20K
C14
4700pF
V1
VIN1
C10
47nF
C17
4.7nF
VIN
R1
383K
FB2
LP
PG
C1
10uF
C2
3.3uF
VIN
C16
4.7nF
R
L
IM
2
www.ti.com
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
APPLICATION INFORMATION
Design Guide - Step-By-Step Design Procedure
The following example illustrates the design procedure for selecting external components for the three buck
converters. The example focuses on Buck 1, but the procedure can be directly applied to Buck 2 and 3 as well.
The design goal parameters are given in Table 1.
Table 1. Design Parameters
Output voltage
1.2 V
Transient response 0.5-A to 2-A load step
120 mV
Maximum output current
3 A
Input voltage
12 V nom, 9.6 V to 14.4 V
Output voltage ripple
< 30 mV p-p
Switching frequency
500 kHz
Typical Buck 1 Application Schematic
The application schematic of Buck 1 is shown in Figure 31. The design procedure is given below.
Figure 31. Typical Buck 1 Application Circuit
Selecting the Switching Frequency
The first step is to decide on a switching frequency for the regulator. Typically, you will want to choose the
highest switching frequency possible since this will produce the smallest solution size. The high switching
Copyright 2010–2011, Texas Instruments Incorporated
21
Product Folder Link(s): TPS65251
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65252EVM | 功能描述:電源管理IC開發(fā)工具 TPS65252 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65252RHDR | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252RHDT | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65253EVM | 功能描述:電源管理IC開發(fā)工具 TPS65253 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65253RHDR | 功能描述:PMIC 解決方案 4.5V-16Vin/2 Buck Converters RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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