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参数资料
| 型号： | TPS53125PW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, TSSOP-24 |
| 文件页数： | 9/27页 |
| 文件大小： | 791K |
| 代理商： | TPS53125PW |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
L =
1
(V
-V
IN(MAX)
O1)
I
f
L (RIPPLE)
SW
1
V
O1
V
IN(MAX)
=
(V
-V
IN(MAX)
O1)
0.3
I
f
O
SW
V
o1
V
IN(MAX)
1
I
=
L (RIPPLE)
1
V
-V
IN(MAX)
O
1
L
f
1
SW
V
o
1
V
IN(MAX)
I
=
L (PEAK)
1
V
TRIP
R
DS(ON)
+ I
L (RIPPLE)
1
I
=
L (RMS)
1
I
O
1
2 + 1
12
(I
)
L (RIPPLE)
1
2
C =
1
I
L (RIPPLE)
1
8
1
VO (RIPPLE)
1
f
SW
C1 =
DI
L
load
2
1
2
1
V
O
DV
OS
C1 =
DI
L
load
2
1
2
K
DV
US
K=(V-V
IN
O
1)
T
on
1
T
on
min(off)
1+
www.ti.com
SLVS947B – OCTOBER 2009 – REVISED JANUARY 2010
APPLICATION INFORMATION
1. Choose inductor.
The inductance value is selected to provide approximately 30% peak to peak ripple current at maximum load.
Larger ripple current increases output ripple voltage, improve S/N ratio and contribute to stable operation.
Equation 3 can be used to calculate L1.
(3)
The inductors current ratings needs to support both the RMS (thermal) current and the Peak (saturation)
current. The RMS and peak inductor current can be estimated as follows.
(4)
(5)
(6)
Note: The calculation above shall serve as a general reference. To further improve transient response, the
output inductance could be reduced further. This needs to be considered along with the selection of the
output capacitor.
2. Choose output capacitor.
The capacitor value and ESR determines the amount of output voltage ripple and load transient response. it
is recommended to use a ceramic output capacitor.
(7)
(8)
(9)
Where
(10)
Select the capacitance value greater than the largest value calculated from Equation 7, Equation 8 and
Equation 9. The capacitance for C1 should be greater than 66
μF.
Where
ΔVOS = The allowable amount of overshoot voltage in load transition
ΔVUS = The allowable amount of undershoot voltage in load transition
Tmin(off) = Minimum off time
3. Choose input capacitor.
The TPS53125 requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A minimum 10-
μF high-quality ceramic capacitor is recommended for the input capacitor. The
capacitor voltage rating needs to be greater than the maximum input voltage.
Copyright 2009–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPS53125
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| TPS53125PWR | DUAL SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO24 |
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| TPS53126RGET | 0.17 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC24 |
| TPS53126PW | 0.17 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS53125PWR | 功能描述:DC/DC 开关控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS53125RGER | 功能描述:DC/DC 开关控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS53125RGET | 功能描述:DC/DC 开关控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS53126 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS |
| TPS53126EVM-600 | 功能描述:电源管理IC开发工具 TPS53126 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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