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參數(shù)資料
| 型號： | LTC1504CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1 A SWITCHING REGULATOR, 250 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 249K |
| 代理商： | LTC1504CS8 |
8
LTC1504
APPLICATIO
S I
FOR
ATIO
U
half the ripple current and its value should be chosen
based on the desired ripple current and/or the output
current transient requirements. Large value inductors
lower ripple current and decrease the required output
capacitance, but limit the speed that the LTC1504 can
change the output current, limiting output transient re-
sponse. Small value inductors result in higher ripple
currents and increase the demands on the output capaci-
tor, but allow faster output current slew rates and are often
smaller and cheaper for the same DC current rating. A
typical inductor used in an LTC1504 application might
have a maximum current rating between 500mA and 1A
and an inductance between 33
μ
H and 220
μ
H.
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. Toroid
or shielded pot cores in ferrite or permalloy materials are
small and don’t radiate much energy, but generally cost more
than powdered iron rod core inductors with similar electrical
characteristics. The choice of which style inductor to use
often depends more on the price vs size requirements and any
radiated field/EMI requirements than on what the LTC1504
requires to operate. Table 2 shows some typical surface
mount inductors that work well in LTC1504 applications.
W
U
U
Table 2. Representative Surface Mount Inductors
CORE
TYPE
CORE
MATERIAL
PART
CoilCraft
DT3316-473
DT3316-104
DO1608-473
DO3316-224
Coiltronics
CTX50-1
CTX100-2
CTX50-1P
CTX100-2P
Sumida
CDRH62-470
CDRH73-101
CD43-470
CD54-101
VALUE
MAX DC
HEIGHT
47
μ
H
100
μ
H
47
μ
H
220
μ
H
1A
0.8A
0.5A
0.8A
Shielded
Shielded
Open
Open
Ferrite
Ferrite
Ferrite
Ferrite
5.1mm
5.1mm
3.2mm
5.5mm
50
μ
H
100
μ
H
50
μ
H
100
μ
H
0.65A
0.63A
0.66A
0.55A
Toroid
Toroid
Toroid
Toroid
KoolM
μ
KoolM
μ
Type 52
Type 52
4.2mm
6mm
4.2mm
6mm
47
μ
H
100
μ
H
47
μ
H
100
μ
H
0.54A
0.50A
0.54A
0.52A
Shielded
Shielded
Open
Open
Ferrite
Ferrite
Ferrite
Ferrite
3mm
3.4mm
3.2mm
4.5mm
Output Capacitor
The output capacitor affects the performance of the
LTC1504 in a couple of ways: it provides the first line of
defense during a transient load step and it has a large effect
on the compensation required to keep the LTC1504 feed-
back loop stable. Transient load response of an LTC1504
circuit is controlled almost entirely by the output capacitor
and the inductor. In steady load operation, the average
current in the inductor will match the load current. When
the load current changes suddenly, the inductor is sud-
denly carrying the wrong current and requires a finite
amount of time to correct itself—at least several switch
cycles with typical LTC1504 inductor values. Even if the
LTC1504 had psychic abilities and could instantly assume
the correct duty cycle, the rate of change of current in the
inductor is still related to its value and will not change
instantaneously.
Until the inductor current adjusts to match the load cur-
rent, the output capacitor has to make up the difference.
Applications that require exceptional transient response
(2% or better for instantaneous full-load steps) will re-
quire relatively large value, low ESR output capacitors.
Applications with more moderate transient load require-
ments can often get away with traditional standard ESR
electrolytic capacitors at the output and can use larger
valued inductors to minimize the required output capaci-
tor value. Note that the RMS current in the output capacitor
is slightly more than half of the inductor ripple current—
much smaller than the RMS current in the input bypass
capacitor. Output capacitor lifetime is usually not a factor
in typical LTC1504 applications.
Large value ceramic capacitors used as output bypass
capacitors provide excellent ESR characteristics but can
cause loop compensation difficulties. See the Loop Com-
pensation section.
Loop Compensation
Loop compensation is strongly affected by the output
capacitor. From a loop stability point of view, the output
inductor and capacitor form a series RLC resonant circuit,
with the L set by the inductor value, the C by the value of
the output capacitor and the R dominated by the output
capacitor’s ESR. The amplitude response and phase shift
due to these components is compensated by a network of
Rs and Cs at the COMP pin to (hopefully) close the
feedback loop in a stable manner. Qualitatively, the L and
Kool M
μ
is a registered trademark of Magnetics, Inc..
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