DHC2800S SERIES 5W/5.4W DC-DC CONVERTERS
DHC2812S 鈥?DHC2815S
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
HI-REL DESIGN
鈥?WAVE SOLDERABLE PACKAGE
鈥?ALL CERAMIC CAPACITORS
鈥?SURFACE MOUNT MAGNETICS
FEATURES
鈥?NO DERATING 鈥?鈥?5擄C TO +125擄C
鈥?HIGH ISOLATION 鈥?500V
鈥?OUTPUT VOLTAGE ADJUSTMENT STANDARD
鈥?REMOTE SHUTDOWN
鈥?11 鈥?50V INPUT @ 5 WATTS OUTPUT
Package Dimensions
1" W x 1" L x .35" H
TYPICAL APPLICATION
DESCRIPTION
The DHC2812S and DHC2815S DC-DC converters pro-
vides the ruggedness, reliability and features required to meet
the advanced design challenges of today's hi-rel market. This
has been accomplished while retaining a power density of 15
W/in
3
and 375 mW/gram of power/package performance. The
use of advanced substrate and reflow soldering techniques
during construction results in a rugged, cost-effective and
completely solderable package.
The DHC2800S hybrid converter series utilizes all ceramic
capacitors, surface mount magnetics, and ultrasonically bonded
wires to provide reliable operation at all operating tempera-
tures while surviving G forces of up to 500 G.
The DHC2800S series standard features include output
fault monitoring and/or turn on voltage point programming via
the shutdown pin. All three functions may be implemented
simultaneously with a minimum of external components. An
output voltage adjustment / load compensation pin which
adjusts outputs simultaneously is also standard. However, the
DHC2800S may be ordered without this feature (/F option).
Fault tolerant design protects these converters from most
external circuit faults. The +output and output adjust pins will
withstand +25 V while the shutdown pin will withstand +50 V,
protecting the converters from a variety of system or board
faults; e.g. solder bridges etc. Unique load fault protection
circuitry allows this converter to pull up loads having difficult
static load line characteristics and allows short term load
excursions significantly beyond ratings in most applications.
A transformer isolated flyback converter topology operating
at a switching frequency of 400 kHz allows operation over a
wide input voltage range. Internal filtering of outputs eliminates
the need for external capacitors in many applications.
The 8-pin DIP package (see Package Outlines) is hermeti-
cally sealed and isolated from the internal circuits. Heat sinking
is recommended for full power operation at elevated ambient
temperatures.
8
DHC2800S
5
SET UV
LOCKOUT
SHUTDOWN
OPTO
7
4
1
2
3
6
150K
10nF
+V
COMMON
鈥揤
Control
System
V
TRIM
R
SP
200K
+5V
5K
J174
V
IN
OPERATION
NORMAL
(TTL)
BLOCK DIAGRAM
6
1
2
5
PWM
FEED FORWARD
CONTROLLER
7
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
4
EXTERNAL CONNECTIONS
+ OUTPUT
OUTPUT COMMON
NO CONNECTION
ADJUST/COMP*
SHUTDOWN PLUS
1
2
3
4
5
6
+ INPUT
TOP
VIEW
7
鈥?INPUT
8
CASE
* Optional N/C on DHC2800S/F
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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