參數(shù)資料
型號(hào)： TPS53127RGET
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 11/29頁(yè)
文件大?。?/td> 861K
代理商： TPS53127RGET
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
SLVSA93 – MARCH 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 mF.
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 TPS53127 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.
Copyright 2010, Texas Instruments Incorporated
19
Product Folder Link(s): TPS53127
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