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| 型号： | TPS62700YZFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | LEAD FREE, WCSP-8 |
| 文件页数： | 11/25页 |
| 文件大小： | 856K |
| 代理商： | TPS62700YZFR |
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
Inductor Selection
f
I
V
1
V
I
IN
OUT
L
-
=
D
(2)
2
I
L
MAX
_
OUT
MAX
_
L
D
+
=
(3)
www.ti.com................................................................................................................................................... SLVS784B – DECEMBER 2007 – REVISED JUNE 2008
The inductor value has a direct effect on the ripple current. The selected inductor must have adequate ratings for
dc resistance and saturation current. The inductor ripple current (
ΔIL) decreases with higher inductance and
increases with higher VIN or VOUT.
Equation 2 calculates the maximum inductor current under static load conditions. The saturation current of the
inductor should be rated higher than the maximum peak inductor current as calculated with Equation 3. This is
recommended because during heavy load transients, the inductor current rises above the calculated value.
Where
f = Switching Frequency (2.0 MHz typical)
L = Inductor Value
ΔIL = Peak to Peak inductor ripple current
IL_MAX = Maximum Inductor current
A good approach is to select the inductor current and inductance rating for the maximum switch current limit of
the TPS6270x.
Accepting larger values of ripple current allows the use of lower inductance values, but results in higher
output-voltage ripple, greater core losses, and lower output-current capability.
The total losses of the inductor have a strong impact on the efficiency of the DC/DC conversion and consist of
both the losses in the dc resistance (RL) and the following frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic-field losses of the neighboring windings (proximity effect)
Radiation losses
Table 1. List Of Inductors
DIMENSIONS (mm)
INDUCTOR Series
SUPPLIER
2,5 × 2,0 × 1,2
KSLI-252012AG
Hitachi Metals
2,5 × 2,0 × 1,2
MIPSA2520
FDK
2,5 x 2,0 x 1,2
LQM2HPN
Murata
2,8 × 2,6 × 1,4
VLF3014AT
TDK
3,9 × 3,9 × 1,7
LPS4018
Coilcraft
Copyright 2007–2008, Texas Instruments Incorporated
19
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