DAC2800S Datasheet PDF - MSK
| Part Number | DAC2800S | |
| Description | 5.4W DC-DC CONVERTERS | |
| Manufacturers | MSK | |
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M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
5.4W
DC-DC
CONVERTERS
FEATURES:
Wave Solderable Package
All Ceramic Capacitors
Surface Mount Magnetics
MIL STD 461C CR03 (DC-DC Converters)
80 Volt Input Transient Tolerent
www.DataShWeeti4dUe.cSomupply Range - 11V to 50V
High Isolation - 500V
High Power Density - 15 W/in³
Output Voltage Adjustment - Standard
Remote Shutdown
Operates to 11V Input at 5W
Available with 12V or 15V Outputs
See DHC2800S Series for 3.3V and 5.0V Versions
Available Soon to DSCC SMD 5962-93093, 5962-94631,
5962-93094 and 5962-94630
Replaces Interpoint MSA2812S, MSA2815S and
IR ASA2812S, ASA2815S
ISO-9001 CERTIFIED BY DSCC
DAC2800S
SERIES
(315) 701-6751
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The DAC2812S and DAC2815S DC-DC converters are higher output voltage companion devices to MSK's
DHC types. The DAC's provide 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/
in3 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 DAC2800S hybrid converter series utilizes all ceramic capacitors, surface mount magnetics, and
ultrasonically bonded wires to provide reliable operation at all operating temperatures.
The DAC2800S 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.
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 package is hermetically sealed and isolated from the internal circuits. Heat sinking is
recommended for full power operation at elevated ambient temperatures.
1 Rev. C 7/04
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APPLICATION NOTES
POWER SUPPLIES
The output voltage of the DAC2812S and DAC2815S may
be adjusted from 90% to 110% of nominal value by the use of
a 150KΩ potentiometer as shown. Adjustment beyond this
range is possible however certain characteristics of the con-
verter such as but not limited to input voltage range, efficiency,
ripple and temperature performance will change. Characteriza-
tion by the user is recommended in such applications.
LOAD FAULT RESPONSE
The MSK families of DC-DC converters share load fault phi-
losophies. Load fault conditions include short-circuit and se-
vere overload conditions. The DAC2800S converter series re-
sponds to load faults by turning off all power conversion cir-
cuits for 250mS and then attempting to restart for 10mS (typi-
cal). The net "on" duty factor during a fault is very low result-
ing in low converter dissipation and immunity from overheating
at 125°C. Current beyond rated can flow into the load at
startup time. This allows the converter to bring up capacitive
and other difficult load types more reliably than competing con-
verters.
www.DataSheet4U.com
Adjust/comp (pin 4) may be driven by external circuitry refer-
enced to pin 2 (-output) if desired. Grounding pin 4 causes
voltage to increase (25% typically) while driving pin 4 above
1.3V causes output voltage to decrease. Pin 4 may be driven
negative without damage, however the resultant increase in
converter output voltage should be considered. Pin 4 may be
driven through 10KΩ or more if connection of the comp func-
tion is also required.
The comp function of pin 4 allows load transient response to
be tailored to suit specific application requirements. This fea-
ture may be utilized by connecting a 10 or less nF capacitor
between pins 4 and 1.
Note: The DAC2812S and DAC2815S use pin 4 while the
DHC2803S and DHC2805S use pin 3.
SHUTDOWN PLUS
Pin 5 is used for remote shutdown, output fault detection,
and/or setting the input voltage point at which the converter
will turn on as shown in the typical application diagram. No
connection to pin 5 is necessary for normal operation of the
converter. Pin 5 is referenced to the pin 7 (-input).
Shutdown may be implemented by simply connecting pin 5
to an open collector logic output or switch rated at 2.5mA,
25Vdc or higher.
Input voltage turn on point is programmed with a single resis-
tor from pin 5 to 7. An input turn on/off hysteresis (typically
3.5% of Vin) will be observed. This should be considered when
making or verifying set point adjustment. The value of the
setpoint resistor may be determined by the following:
R= 210·10³ (±10% accuracy at 25°C)
ETO-9.5
Set point temperature coefficient is typically +400ppm/°C.
Output fault monitoring is accomplished by observing pin 5
with a high impedance monitoring circuit. Pin 5 voltage drops
from over 10V to below 1V when a load fault causes the con-
verters fault protection circuitry to activate. It will remain low
for at least 100mS and return high. If the load fault is still
present pin 5 will return low and the cycle will repeat. A resis-
tor >400KΩ from pin 5 to 7 provides pull down for pin 5 if
there is no input setpoint programming resistor already in place.
5
Rev. C 7/04
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DAC2800S electronic component. |
| Information | Total 9 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DAC2800S.PDF Datasheet ] | |
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