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参数资料
| 型号： | LTC3615EUF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件页数： | 9/32页 |
| 文件大小： | 585K |
| 代理商： | LTC3615EUF#PBF |
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LTC3615/LTC3615-1
17
3615fa
the burst clamp. Lower inductor values result in higher
ripple current which causes this to occur at lower DC
load currents. This causes a dip in efciency in the upper
range of low current operation. In Burst Mode operation,
lower inductance values will cause the burst frequency
to increase.
Inductor Core Selection
Once the value for L is known, the type of inductor must
be selected. Actual core loss is independent of core size
for xed inductor value, but it is very dependent on the
inductance selected. As the inductance increases, core
losses decrease. Unfortunately, increased inductance
requires more turns of wire, and therefore, copper losses
will increase.
Ferrite designs have very low core losses and are preferred
at high switching frequencies, so design goals can
concentrate on copper loss and preventing saturation.
Ferrite core material saturates hard, which means that
inductance collapses abruptly when the peak design current
is exceeded. This results in an abrupt increase in inductor
ripple current and consequent output voltage ripple. Do
not allow a ferrite core to saturate!
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 do not radiate much energy, but generally
cost more than powdered iron core inductors with similar
characteristics. The choice of which style inductor to use
mainly depends on the price versus size requirements
and any radiated eld/EMI requirements. Table 1 shows
some typical surface mount inductors that work well in
LTC3615 applications.
Input Capacitor CIN Selection
In continuous mode, the source current of the top P-channel
MOSFET is a square wave of duty cycle VOUT/VIN.Toprevent
large voltage transients, a low ESR capacitor sized for the
maximum RMS current must be used for CIN.
The maximum RMS capacitor current is given by:
II
V
RMS
OUT MAX
OUT
IN
OUT
=
()
– 1
This formula has a maximum at VIN = 2VOUT, where IRMS =
IOUT/2.Thissimpleworst-caseconditioniscommonlyused
for design because even signicant deviations do not offer
much relief. Note that ripple current ratings from capacitor
manufacturers are often based on only 2000 hours of life
which makes it advisable to further derate the capacitor,
or choose a capacitor rated at a higher temperature than
required. Several capacitors may also be paralleled to meet
size or height requirements in the design.
APPLICATIONS INFORMATION
Table 1. Representative Surface Mount Inductors
INDUCTANCE
(μH)
DCR
(mΩ)
MAX
CURRENT (A)
DIMENSIONS
(mm)
HEIGHT
(mm)
Vishay IHLP-2020BZ-01
0.33
7.6
25
5.18 × 5.49
2
0.47
8.9
21
5.18 × 5.49
2
0.68
11.2
15
5.18 × 5.49
2
1
18.9
16
5.18 × 5.49
2
Toko DE3518C Series
0.22
8
24
4.3 × 4.7
2
Sumida CDMC6D28 Series
0.3
3.2
15.4
6.7 × 7.25
3
0.47
4.2
13.6
6.7 × 7.25
3
0.68
5.4
11.3
6.7 × 7.25
3
1
8.8
6.7 × 7.25
3
NEC/Tokin MPLC0730L Series
0.47
4.5
16.6
6.9 × 7.7
3.0
0.75
7.5
12.2
6.9 × 7.7
3.0
1.0
9.0
10.6
6.9 × 7.7
3.0
Coilcraft DO1813H Series
0.33
4
10
8.9 × 6.1
5
0.56
10
7.7
8.9 × 6.1
5
Coilcraft SLC7530 Series
0.27
0.1
14
7.5 × 6.7
3
0.35
0.1
11
7.5 × 6.7
3
0.4
0.1
8
7.5 × 6.7
3
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3615EFE#PBF | SWITCHING REGULATOR, PDSO24 |
| LTC3615IFE-1#PBF | SWITCHING REGULATOR, PDSO24 |
| LTC3615EUF#TRPBF | SWITCHING REGULATOR, PQCC24 |
| LTC3615IFE#PBF | SWITCHING REGULATOR, PDSO24 |
| LTC3727IG-1#TR | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3615HFE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 3A 24TSSOP |
| LTC3615HFE#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 3A 24TSSOP |
| LTC3615HFE-1#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 3A 24TSSOP |
| LTC3615HFE-1#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 3A 24TSSOP |
| LTC3615HUF#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 3A 24TSSOP |
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