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參數資料
| 型號： | TPS53114PWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數： | 8/27頁 |
| 文件大小： | 912K |
| 代理商： | TPS53114PWR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁當前第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁
L1=
(
-
1)
V
IN(max)
O
I
f
L (ripple)
SW
1
V
O
V
IN(max)
=
3 (
-
1)
V
IN(max)
O
I
f
O
SW
1
V
O1
V
IN(max)
1
I
L (ripple)
1
=
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
I
O
L (ripple)
1+(
)
2
1
12
C1=
D I
L
load
2
1
2
1
V
O
DV
OS
C1=
D I
L
load
2
1
2
K
DV
US
K
V
=(
-
1)
IN
O
T
on1
T
ON
min(off)
1+
C1=
I
L (ripple)
1
8
1
VO (ripple)
1
f
SW
SLVS887B – APRIL 2009 – REVISED OCTOBER 2010
www.ti.com
COMPONENT SELECTION
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. L1 can
be calculated using Equation 3.
(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.
CHOOSE OUTPUT CAPACITOR
The capacitor value and ESR determines the amount of output voltage ripple and load transient response.
Recommend to use ceramic output capacitor.
(7)
(8)
Where:
(9)
(10)
Select the capacitance value greater than the largest value calculated from Equation 7, Equation 8 and
Equation 10. The capacitance for C1 should be greater than 66 mF.
Where:
Δ VOS = The allowable amount of overshoot voltage in load transition
ΔVUS = The allowable amount of undershoot voltage in load transition
Tmin(off) = Minimum off time
CHOOSE INPUT CAPACITOR
The TPS53114 requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A minimum 10-mF high-quality ceramic capacitor is recommended for the input capacitor. The
capacitor voltage rating needs to be greater than the maximum input voltage.
16
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS53114
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