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LTC1174CS8 Datasheet(PDF) 12 Page - Linear Technology

Part # LTC1174CS8
Description  High Efficiency Step-Down and Inverting DC/DC Converter
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1174CS8 Datasheet(HTML) 12 Page - Linear Technology

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LTC1174
LTC1174-3.3/LTC1174-5
1174fe
APPLICATIO S I FOR ATIO
Solving for L in the above equation and with VD = 0.6V,
L = 44.8
µH. The next higher standard value of L is 50µH
(example: Coiltronics CTX50-4). The operating frequency,
neglecting voltage across diode VD is:
f
V
V
kHz
OUT
IN
≈−
⎛
⎝⎜
⎞
⎠⎟
=
2 5 10 1
111
5
.•
With the value of L determined, the requirements for CIN
and COUT are calculated. For CIN, its RMS current rating
should be at least:
I
IV
V
V
V
A
mA
RMS
OUT
OUT
IN
OUT
IN
RMS
=
−
()
[]
()
=
12
174
/
For COUT, the RMS current rating should be at least:
I
I
A
mA
RMS
PEAK
RMS
≈
()
=
2
300
Now allow VIN to drop to 6V. At this minimum input voltage
the operating frequency will decrease. The new frequency
is 42kHz.
Table 1. Inductor Manufacturers
MANUFACTURER
PART NUMBER
Coilcraft
DT3316 Series
1102 Silver Lake Road
Cary, IL 60013
(708) 639-2361
Coiltronics Inc.
Econo-Pac
6000 Park of Commerce Blvd.
Octa-Pac
Boca Raton, FL 33487
(407) 241-7876
Gowanda Electronics Corporation
GA10 Series
1 Industrial Place
Gowanda, NY 14070
(716) 532-2234
Sumida Electric Co. Ltd.
CD 54 Series
637 E. Golf Road, Suite 209
CD 75 Series
Arlington Heights, IL 60005
(708) 956-0666/7
Table 2. Capacitor Manufacturers
MANUFACTURER
PART NUMBER
AVX Corporation
TPS Series
P.O. Box 887
TAJ Series
Myrtle Beach, SC 29578
(803) 448-9411
Nichicon America Corporation
PL Series
927 East State Parkway
Schaberg, IL 60173
(708) 843-7500
Sanyo Video Components
OS-CON Series
2001 Sanyo Avenue
San Diego, CA 92173
(619) 661-6385
Attn: Sales Dept.



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