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參數(shù)資料
| 型號： | LT1578IS8-2.5 |
| 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： | SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 286K |
| 代理商： | LT1578IS8-2.5 |
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11
LT1578/LT1578-2.5
APPLICATIO
S I
FOR
ATIO
U
W
U
U
(
( )( )( )
I
I
V
V
V
f L V
PEAK
OUT
OUT
2
IN
OUT
IN
=
+
)
V
IN
= Maximum input voltage
f = Switching frequency, 200kHz
3. Decide if the design can tolerate an “open” core geom-
etry like a rod or barrel, with high magnetic field
radiation, or whether it needs a closed core like a toroid
to prevent EMI problems. One would not want an open
core next to a magnetic storage media, for instance!
This is a tough decision because the rods or barrels are
temptingly cheap and small and there are no helpful
guidelines to calculate when the magnetic field radia-
tion will be a problem.
4. Start shopping for an inductor (see representative
surface mount units in Table 1) which meets the
requirements of core shape, peak current (to avoid
saturation), average current (to limit heating), and fault
current (if the inductor gets too hot, wire insulation will
melt and cause turn-to-turn shorts). Keep in mind that
all good things like high efficiency, low profile, and high
temperature operation will increase cost, sometimes
dramatically. Get a quote on the cheapest unit first to
calibrate yourself on price, then ask for what you really
want.
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 1
SERIES
RESIS-
CORE
MATER- HEIGHT
IAL
VENDOR/
PART NO.
Coiltronics
CTX15-2
CTX33-2
CTX68-4
CTX15-1P
CTX33-2P
CTX68-4P
Sumida
CDRH74-150
CDH115-330
CDRH125-680
CDH74-330
Coilcraft
DO3308P-153
DO3316P-333
DO3316P-683
Pulse
PE-53602
PE-53604
PE-53632
PE-53633
Gowanda
SMP3316-152K
SMP3316-332K
SMP3316-682K
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM
μ
= Kool M
μ
VALUE
(
μ
H)
DC
CORE
TYPE TANCE(
)
(Amps)
(mm)
15
33
68
15
33
68
1.7
1.4
1.2
1.4
1.3
1.1
Tor
Tor
Tor
Tor
Tor
Tor
0.059
0.106
0.158
0.087
0.126
0.238
KM
μ
KM
μ
KM
μ
52
52
52
6.0
6.0
6.4
4.2
6.0
6.4
15
33
68
33
1.47
1.68
1.5
1.45
SC
SC
SC
SC
0.081
0.082
0.12
0.17
Fer
Fer
Fer
Fer
4.5
5.2
6
5.2
15
33
68
2
2
SC
SC
SC
0.12
0.1
0.18
Fer
Fer
Fer
3
5.21
5.21
1.4
35
73
22
40
1.4
1.3
2.7
2.7
Tor
Tor
Tor
Tor
0.166
0.290
0.063
0.085
Fer
Fer
Fer
Fer
9.1
9.1
9.1
10
15
33
68
3.5
2.3
1.7
SC
SC
SC
0.041
0.092
0.178
Fer
Fer
Fer
6
6
6
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