參數(shù)資料
型號： TPS53125PW
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO24
封裝： GREEN, PLASTIC, TSSOP-24
文件頁數(shù)： 9/27頁
文件大?。?/td> 791K
代理商： TPS53125PW
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
相關(guān)PDF資料
PDF描述
TPS53125PWR DUAL SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO24
TPS53126PWR 0.17 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24
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
TPS53129PWR DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS53125PWR 功能描述:DC/DC 開關(guān)控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS53125RGER 功能描述:DC/DC 開關(guān)控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS53125RGET 功能描述:DC/DC 開關(guān)控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS53126 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
TPS53126EVM-600 功能描述:電源管理IC開發(fā)工具 TPS53126 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
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