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参数资料
型号： LT1376IN8-5#TR
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDIP8
封装： 0.300 INCH, PLASTIC, DIP-8
文件页数： 4/28页
文件大小： 500K
代理商： LT1376IN8-5#TR
12
LT1375/LT1376
13756fd
APPLICATIONS INFORMATION
WU
U
5. After making an initial choice, consider the secondary
things like output voltage ripple, second sourcing, etc.
Use the experts in the Linear Technology’s applica-
tions department if you feel uncertain about the final
choice. They have experience with a wide range of
inductor types and can tell you about the latest devel-
opments in low profile, surface mounting, etc.
Table 2
SERIES
CORE
VENDOR/
VALUE
DC
CORE
RESIS-
MATER-
HEIGHT
PART NO.
(
H) (Amps) TYPE TANCE()
IAL
(mm)
Coiltronics
CTX5-1
5
2.3
Tor
0.027
KM
4.2
CTX10-1
10
1.9
Tor
0.039
KM
4.2
CTX20-1
20
1.0
Tor
0.137
KM
4.2
CTX15-2
15
1.8
Tor
0.058
KM
6.0
CTX20-3
20
1.5
Tor
0.093
KM
4.7
CTX20-4
20
2.2
Tor
0.059
KM
6.4
CTX5-1P
5
1.8
Tor
0.021
52
4.2
CTX10-1P
10
1.6
Tor
0.030
52
4.2
CTX15-1P
15
1.2
Tor
0.046
52
4.2
CTX20-1P
20
1.0
Tor
0.081
52
4.2
CTX20-2P
20
1.3
Tor
0.052
52
6.0
CTX20-4P
20
1.8
Tor
0.039
52
6.35
Sumida
CDRH64
10
1.7
SC
0.084
Fer
4.5
CDRH74
22
1.2
SC
0.077
Fer
4.5
CDRH73
10
1.7
SC
0.055
Fer
3.4
CDRH73
22
1.1
SC
0.15
Fer
3.4
CD73
10
1.4
Open
0.062
Fer
3.5
CD73
18
1.1
Open
0.085
Fer
3.5
CD104
10
2.4
Open
0.041
Fer
4.0
CD104
18
1.7
Open
0.062
Fer
4.0
Gowanda
SM20-102K
10
1.3
Open
0.038
Fer
7.0
SM20-152K
15
1.3
Open
0.049
Fer
7.0
SM20-222K
22
1.3
Open
0.059
Fer
7.0
Dale
IHSM-4825
10
3.1
Open
0.071
Fer
5.6
IHSM-4825
22
1.7
Open
0.152
Fer
5.6
IHSM-5832
10
4.3
Open
0.053
Fer
7.1
IHSM-5832
22
2.8
Open
0.12
Fer
7.1
IHSM-7832
22
3.8
Open
0.054
Fer
7.1
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM
= Kool M
Output Capacitor
The output capacitor is normally chosen by its Effective
Series Resistance (ESR), because this is what determines
output ripple voltage. At 500kHz, any polarized capacitor
is essentially resistive. To get low ESR takes
volume, so
physically smaller capacitors have high ESR. The ESR
range for typical LT1376 applications is 0.05
to 0.5. A
typical output capacitor is an AVX type TPS, 100
F at 10V,
with a guaranteed ESR less than 0.1
. This is a “D” size
surface mount solid tantalum capacitor. TPS capacitors
are specially constructed and tested for low ESR, so they
give the lowest ESR for a given volume. The value in
microfarads is not particularly critical, and values from
22
F to greater than 500F work well, but you cannot
cheat mother nature on ESR. If you find a tiny 22
F solid
tantalum capacitor, it will have high ESR, and output ripple
voltage will be terrible. Table 3 shows some typical solid
tantalum surface mount capacitors.
Table 3. Surface Mount Solid Tantalum Capacitor ESR
and Ripple Current
E Case Size
ESR (Max.,
)
Ripple Current (A)
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 1.1
AVX TAJ
0.7 to 0.9
0.4
D Case Size
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 1.1
AVX TAJ
0.9 to 2.0
0.36 to 0.24
C Case Size
AVX TPS
0.2 (typ)
0.5 (typ)
AVX TAJ
1.8 to 3.0
0.22 to 0.17
B Case Size
AVX TAJ
2.5 to 10
0.16 to 0.08
Many engineers have heard that solid tantalum capacitors
are prone to failure if they undergo high surge currents.
This is historically true, and type TPS capacitors are
specially tested for surge capability, but surge ruggedness
is not a critical issue with the
output capacitor. Solid
tantalum capacitors fail during very high
turn-on surges,
which do not occur at the output of regulators. High
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