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| 型号： | TPS62650YFFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.7 A SWITCHING REGULATOR, 6600 kHz SWITCHING FREQ-MAX, BGA9 |
| 封装： | GREEN, DSBGA-9 |
| 文件页数： | 24/38页 |
| 文件大小： | 820K |
| 代理商： | TPS62650YFFR |
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O
I
O
L
L(MAX)
O(MAX)
I
V
V - V
I
I =
x
I
= I
+
V
L x
2
sw
f
D
SLVS808A
– AUGUST 2009 – REVISED FEBRUARY 2011
APPLICATION INFORMATION
INDUCTOR SELECTION
The TPS6265x series of step-down converters have been optimized to operate with an effective inductance
value in the range of 0.3
μH to 1.3μH and with output capacitors in the range of 4.7μF to 10μF. The internal
compensation is optimized to operate with an output filter of L = 0.47
μH and CO = 4.7μF. Larger or smaller
inductor values can be used to optimize the performance of the device for specific operation conditions. For more
details, refer to the section "checking loop stability".
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
(1)
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 TPS6265x converters.
Table 3. List of Inductors
MANUFACTURER
SERIES
DIMENSIONS
LQM21PN1R0NGR
2.0 x 1.2 x 1.0 max. height
LQM21PNR54MG0
2.0 x 1.2 x 1.0 max. height
MURATA
LQM21PNR47MG0
2.0 x 1.2 x 1.0 max. height
LQM2MPN1R0NG0
2.0 x 1.6 x 1.0 max. height
TOKO
MDT2012-CX1R0A
2.0 x 1.2 x 1.0 max. height
FDK
MIPS2012D1R0-X2
2.0 x 1.2 x 1.0 max. height
30
2009–2011, Texas Instruments Incorporated
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