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參數資料
| 型號： | TPS62601YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 6600 kHz SWITCHING FREQ-MAX, BGA6 |
| 封裝： | GREEN, DSBGA-6 |
| 文件頁數： | 7/24頁 |
| 文件大小： | 785K |
| 代理商： | TPS62601YFFT |
APPLICATION INFORMATION
INDUCTOR SELECTION
DIL +
V
O
V
I
V
I *
V
O
L
sw
DIL(MAX) + IO(MAX) )
DIL
2
(2)
www.ti.com ...................................................................................................................................................................................................... SLVS678 – JUNE 2008
The TPS6260x series of step-down converters have been designed to operate with an effective inductance value
in the range of 0.3
H to 1.3H and with output capacitors in the range of 4.7F to 10F. The internal
compensation is optimized to operate with an output filter of L = 0.47
H and C
O = 4.7F. Larger or smaller
inductor values can be used to optimize the performance of the device for specific operation conditions. For more
details, see the CHECKING LOOP STABILITY section.
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its dc resistance and saturation current. The
inductor ripple current (
ΔIL) decreases with higher inductance and increases with higher VI or VO.
with: fSW = switching frequency (6 MHz typical)
L = inductor value
ΔIL = peak-to-peak inductor ripple current
IL(MAX) = maximum inductor current
In high-frequency converter applications, the efficiency is essentially affected by the inductor AC resistance (i.e.
quality factor) and to a smaller extent by the inductor DCR value. To achieve high efficiency operation, care
should be taken in selecting inductors featuring a quality factor above 25 at the switching frequency. Increasing
the inductor value produces lower RMS currents, but degrades transient response. For a given physical inductor
size, increased inductance usually results in an inductor with lower saturation current.
The total losses of the coil consist of both the losses in the DC resistance (R(DC)) 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
The following inductor series from different suppliers have been used with the TPS6260x converters.
Table 1. List of Inductors
MANUFACTURER
SERIES
DIMENSIONS
LQM21P_J0
2.0 x 1.2 x 1.0 max. height
MURATA
LQM21P_C0
2.0 x 1.2 x 0.55 max. height
HSLI-201210AG-R47
2.0 x 1.2 x 1.0 max. height
HITACHI METALS
HSLI-201210SW-R85
2.0 x 1.2 x 1.0 max. height
JSLI-201610AG-R70
2.0 x 1.6 x 1.0 max. height
TOKO
MDT2012-CX1R0-R
2.0 x 1.2 x 1.0 max. height
Copyright 2008, Texas Instruments Incorporated
15
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