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參數(shù)資料
| 型號： | LTC1174-3.3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器) |
| 中文描述： | 高效率降壓和倒轉(zhuǎn)DC / DC轉(zhuǎn)換器（高效率，步降直流/直流變換器） |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 246K |
| 代理商： | LTC1174-3.3 |
11
LTC1174
LTC1174-3.3/LTC1174-5
For C
OUT
, the RMS current rating should be at least:
I
I
A
mA
RMS
PEAK
2
300
RMS
≈
(
)
=
Now allow V
IN
to drop to 6V. At this minimum input voltage
the operating frequency will decrease. The new frequency
is 42kHz.
Table 1. Inductor Manufacturers
MANUFACTURER
Coilcraft
1102 Silver Lake Road
Cary, IL 60013
(708) 639-2361
Coiltronics Inc.
6000 Park of Commerce Blvd.
Boca Raton, FL 33487
(407) 241-7876
Gowanda Electronics Corporation
1 Industrial Place
Gowanda, NY 14070
(716) 532-2234
Sumida Electric Co. Ltd.
637 E. Golf Road, Suite 209
Arlington Heights, IL 60005
(708) 956-0666/7
PART NUMBER
DT3316 Series
Econo-Pac
Octa-Pac
GA10 Series
CD 54 Series
CD 75 Series
Table 2. Capacitor Manufacturers
MANUFACTURER
AVX Corporation
P.O. Box 887
Myrtle Beach, SC 29578
(803) 448-9411
Nichicon America Corporation
927 East State Parkway
Schaberg, IL 60173
(708) 843-7500
Sanyo Video Components
2001 Sanyo Avenue
San Diego, CA 92173
(619) 661-6385
Attn: Sales Dept.
PART NUMBER
TPS Series
TAJ Series
PL Series
OS-CON Series
Figure 8. Continuous Inductor Current
APPLICATIOU
DESIGN EXAMPLE
As a design example, assume V
IN
= 9V (nominal), V
OUT
=
5V, and I
OUT
= 350mA maximum. The LTC1174-5 is used
for this application, with I
PGM
(Pin 7) connected to V
IN
. The
minmum value of L is determined by assuming the
LTC1174-5 is operating in continuous mode.
W
U
U
With I
OUT
= 350mA and I
PEAK
= 0.6A (I
PGM
= V
IN
), I
V
=
0.1A.The peak-to-peak ripple inductor current, I
RIPPLE
, is
0.5A and is also equal to:
I
V
V
L
A
RIPPLE
OUT
D
P P
=
+
(
)
4 10
6
Solving for L in the above equation and with V
D
= 0.6V,
L = 44.8
μ
H. The next higher standard value of L is 50
μ
H
(example: Coiltronics CTX50-4). The operating frequency,
neglecting voltage across diode V
D
is:
f
V
V
kHz
OUT
IN
≈
=
2.
111
5
With the value of L determined, the requirements for C
IN
and C
OUT
are calculated. For C
IN
, its RMS current rating
should be at least:
I
I
V
V
V
V
A
mA
RMS
OUT
OUT
IN
OUT
IN
RMS
=
(
)
[
]
(
)
=
1 2
/
174
I
TIME
I
PEAK
I
V
AVG CURRENT= I
OUT
=
= 350mA
I
PEAK
+ I
V
2
1174 F08
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