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| 型号： | TPS62082DSGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.002 A SWITCHING REGULATOR, PDSO8 |
| 封装： | 2 X 2 MM, GREEN, PLASTIC, WSON-8 |
| 文件页数： | 7/26页 |
| 文件大小： | 872K |
| 代理商： | TPS62082DSGR |
SW
IN
OUT
L
MAX
,
OUT
MAX
,
L
f
L
V
1
V
I
2
I
-
=
D
+
=
SLVSAE8
– SEPTEMBER 2011
APPLICATION INFORMATION
Output Filter Design
The inductor and the output capacitor together provide a low pass frequency filter. To simplify this process
Table 3 outlines possible inductor and capacitor value combinations for the most application.
Table 3. Matrix of Output Capacitor / Inductor Combinations
COUT [F]
(1)
L [
H](1)
10
22
47
100
150
0.47
1
+
+(2)(3)
+
2.2
+
4.7
(1)
Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary
by+20% and -50%. Inductor tolerance and current de-rating is anticipated. The effective inductance
can vary by +20% and -30%.
(2)
Plus mark indicates recommended filter combinations.
(3)
Filter combination in typical application.
Inductor Selection
Main parameter for the inductor selection is the inductor value and then the saturation current of the inductor. To
calculate the maximum inductor current under static load conditions, Equation 4 is given.
(2)
Where
IOUT,MAX = Maximum output current
ΔIL = Inductor current ripple
fSW = Switching frequency
L = Inductor value
It's recommended to choose the saturation current for the inductor 20%~30% higher than the IL,MAX, out of
Equation 4. A higher inductor value is also useful to lower ripple current, but will increase the transient response
time as well. The following inductors are recommended to be used in designs.
Table 4. List of Recommended Inductors
INDUCTANCE
CURRENT RATING
DIMENSIONS
DC RESISTANCE
TYPE
MANUFACTURER
[
H]
[mA]
L x W x H [mm3]
[m
Ω typ]
1.0
2500
3 x 3 x 1.2
35
XFL3012-102ME
Coilcraft
1.0
1650
3 x 3 x 1.2
40
LQH3NPN1R0NJ0
Murata
2.2
2500
4 x 3.7 x 1.65
49
LQH44PN2R2MP0
Murata
2.2
1600
3 x 3 x 1.2
81
XFL3012-222ME
Coilcraft
Capacitor Selection
The input capacitor is the low impedance energy source for the converter which helps to provide stable
operation. A low ESR multilayer ceramic capacitor is recommended for best filtering and should be placed
between VIN and PGND as close as possible to that pins. For most applications 10
μF will be sufficient, a larger
value reduces input current ripple.
Copyright
2011, Texas Instruments Incorporated
15
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