Linear Technology DC193 Demo Manual page 7

OPERATIO
Inductor
The inductor size, shape, efficiency, form factor and cost
are variables that can be traded off against one another.
The only fixed requirement of the inductor used with the
LTC1626 is that it must be able to support the output DC
current and still maintain its inductance value.
Although the inductor used in the demo board is from
Sumida, there are a wide variety of inductors available
from other manufacturers. Coilcraft's DO3316 series and
Coiltronics CTX series are also suitable in this demo board.
However, recharacterizing the circuit for efficiency is
necessary if any of the alternate inductors are used in place
of the existing one.
We suggest you contact some of the inductor manufactur-
ers in Table 1 and discuss your needs with them. Very
often, a standard low cost solution which will meet your
needs is on the shelf.
Sense Resistor
The current sense resistor specified in the component list
is manufactured by IRC. Alternative resistor sources in-
clude Dale and KRL/Bantry.
Schottky Diode
At high input voltages, the diode conducts most of the
time. As V approaches V
IN
small fraction of the time. The most stressful condition for
the diode is when the output is short circuited. Under this
condition the diode must safely handle I
100% duty cycle. Schottky diodes are a good choice for
low forward drop and fast switching times. Most LTC1626
circuits will be well served by an MBRS0520LT1 Schottky
diode.
Component Manufacturers
Besides those components that are used on the demon-
stration board other components may also be used. Below
is a partial list of the manufacturers whose components
you can use for the switching regulator. Using compo-
nents other than the ones on the demonstration board
requires recharacterizing the circuit for efficiency.
Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com.
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U
, the diode conducts only a
OUT
PEAK
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Table 1. Inductor Manufacturer
MANUFACTURER
Coilcraft
1102 Silver Lake Road
Cary, IL 60013
(Phone) 847-639-6400
(Fax) 847-639-1469
Coiltronics International
6000 Park of Commerce Blvd.
Boca Raton, FL 33487
(Phone) 561-241-7876
(Fax) 561-241-9339
Dale Electronics Inc.
E. Highway 50
P.O. Box 180
Yankton, SD 57078-0180
(Phone) 605-665-9301
(Fax) 605-665-1627
Sumida Electric Co. Ltd.
5999 New Wilke Rd., Suite #110
Rolling Meadows, IL 60008
(Phone) 847-956-0666
(Fax) 847-956-0702
Table 2. Capacitor Manufacturers
MANUFACTURER
AVX Corporation
P.O. Box 867
Myrtle Beach, SC 29578
(Phone) 803-946-0349
(Fax) 803-448-2170
Sanyo Video Components
2001 Sanyo Avenue
San Diego, CA 92173
(Phone) 619-661-6835
at close to (Fax) 619-661-1055
Sprague
678 Main Street
Sanford, ME 04073
(Phone) 207-324-4140
(Fax) 207-324-7223
DEMO MANUAL DC193
NO DESIGN SWITCHER
PART NUMBERS
D03316 Series
Econo-Pac
Octa-Pac
LPT4545
CD 74B Series
CD 75 Series
CDR105B
PART NUMBERS
TPS Series
OS-CON Series
593D Series
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