ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
5.4W
DC-DC
CONVERTERS
4707 Dey Road Liverpool, N.Y. 13088
DAC2800S
SERIES
(315) 701-6751
MIL-PRF-38534 CERTIFIED
FEATURES:
Wave Solderable Package
All Ceramic Capacitors
Surface Mount Magnetics
MIL STD 461C CR03 (DC-DC Converters)
80 Volt Input Transient Tolerent
Wide Supply 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
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
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
1
2
3
4
5
Isolated Step Down Power Supply
Microprocessor Power Source
Low Voltage Subsystem Power Source
+Output
-Output
NC
Adjust/Comp
Shutdown Plus
8 Case
7 -Input
6 +Input
ABSOLUTE MAXIMUM RATINGS
+50V
VIN Input Voltage (pin 7 to pin 6)
Input
Transient
(pin
7
to
pin
6
@
50mS)
80V
VINT
Output
Current
IOUT
DAC2812S
450mA
DAC2815S
360mA
Case
Temperature
Range
TC
DAC2800S H/E
-55°C to +125°C
DAC2800S
-40°C to +85°C
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TST Storage Temperature Range
TLD Lead Temperature Range
(10 Seconds)
PD Power Dissipation
TJ Junction Temperature
θJC Thermal Resistance
(Switches)
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-65°C to +150°C
300°C
See Efficiency Curve
150°C
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5.0°C/W
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NOTE: Continuous operation at or above the absolute maximum ratings may adversely effect the performance
and/or life of the device.
2
Rev. C 7/04
ELECTRICAL SPECIFICATIONS
DAC2812S
Parameter
Group A
Subgroup
Test Conditions 1
Output Voltage
11V≤VIN≤50V
Output Current 2
16V≤VIN≤40V
Output Voltage Ripple
Input Current Ripple 2
Line Regulation
Load Regulation
BW=10KHz to 2MHz
Step Load Recovery
Step Line Response 2
Step Line Recovery 2
Units
Max.
Min.
Typ.
Max.
1
11.9
12.0
12.1
11.85
12.0
12.15
VDC
2,3
11.76
-
12.24
-
-
-
VDC
1
417
-
-
417
-
-
mA
2,3
417
-
-
-
-
-
mA
1
450
-
-
450
-
-
mA
2,3
450
-
-
-
-
-
mA
1
-
15
60
-
15
60
mVrms
-
-
100
-
-
-
mVrms
1
-
76
125
-
76
125
mAp-p
LIN=2µH
2,3
-
-
200
-
-
-
mAp-p
VIN=16, 28 and 40 VDC
1
-
±5
±25
-
±5
±30
mV
IOUT=0, 208 and 417mA
2,3
-
-
±50
-
-
-
mV
VIN=16, 28 and 40 VDC
1
-
±5
±25
-
±5
±30
mV
IOUT=0, 208 and 417mA
2,3
-
-
±50
-
-
-
mV
1
62
67
-
62
67
-
%
2,3
60
-
-
-
-
-
%
IOUT=208mA to/from 417mA
4
-
±350
±500
-
±350
±500
mV
Transition TIme=30µS
5,6
-
-
±700
-
-
-
mV
IOUT=208mA to/from 417mA
4
-
80
200
-
80
200
µS
Transition TIme=30µS
5,6
-
-
200
-
-
-
µS
VIN=16V to/from 40V
4
-
±200
±500
-
±200
±500
mV
Transition Time=30µS
5,6
-
-
±500
-
-
-
mV
VIN=16V to/from 40V
4
-
90
200
-
90
200
µS
Transition Time=30µS
5,6
-
-
200
-
-
-
µS
4
-
0
200
-
0
200
mV
5,6
-
-
200
-
-
-
mV
4
-
40
60
-
40
60
mS
5,6
-
-
60
-
-
-
mS
4
-
250
500
-
250
500
µS
5,6
-
-
500
-
-
-
µS
-
-
40
60
-
40
60
mS
POUT=5.4W MAX.
1,2,3
16
-
40
16
-
40
V
POUT=5W MAX.
1,2,3
11
-
50
11
-
50
V
Enabled, IOUT=0mA
1,2,3
-
35
50
-
35
50
mA
mA
Start Up Delay
Shutdown Delay 2
Shutdown Recovery 2
Quiescent Current
Typ.
2,3
Start Up Overshoot
Input Voltage Range 2
Min.
DAC2812S
BW=10KHz to 2MHz
Efficiency
Step Load Response
DAC2812S H/E
Disabled IOUT=0mA
1,2,3
-
1.25
2.5
-
1.25
2.5
No Effect on DC Performance
1,2,3
-
-
300
-
-
300
µF
Input to output or any pin to case @ 500V
1
100
-
-
100
-
-
MΩ
Short Circuit Current Limit 7
1
0.50
1.1
1.8
0.50
1.1
1.8
A
Switching Frequency
4
375
400
425
375
400
425
KHz
1
±10
-
-
±10
-
-
%
Capacitive Load 2
Isolation
VOUT Adjustment Range
RPOT=50KΩ
NOTES:
+VIN = 28V, IOUT = 417mA, TA=TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA=TC=+25°C
2, 5 TA=TC=+125°C
3, 6 TA=TC= -55°C
7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults.
8 Consult DSCC SMD for electrical parameters for devices purchased as such.
1
2
3
4
5
6
3
Rev. C 7/04
ELECTRICAL SPECIFICATIONS
DAC2815S
Parameter
Group A
Subgroup
Test Conditions 1
Output Voltage
11V≤VIN≤50V
Output Current 2
16V≤VIN≤40V
Output Voltage Ripple
Input Current Ripple 2
Line Regulation
Load Regulation
Step Load Recovery
Step Line Response 2
Step Line Recovery 2
Typ.
Max.
1
14.90
15.00
15.10
14.85
12.0
15.15
VDC
2,3
14.70
15.00
15.30
-
-
-
VDC
1
333
-
-
333
-
-
mA
2,3
333
-
-
-
-
-
mA
1
360
-
-
360
-
-
mA
2,3
360
-
-
-
-
-
mA
15
60
-
15
60
-
100
-
-
-
mVrms
BW=10KHz to 2MHz
1
-
76
125
-
76
125
mAp-p
LIN=2µH
2,3
-
-
200
-
-
-
mAp-p
VIN=16,28 and 40VDC
1
-
±5
±25
-
±5
±30
mV
IOUT=0,167 and 333mA
2,3
-
-
±50
-
-
-
mV
VIN=16,28 and 40VDC
1
-
±5
±25
-
±5
±30
mV
IOUT=0,167 and 333mA
2,3
-
-
±50
-
-
-
mV
1
63
68
-
63
68
-
%
2,3
61
-
-
-
-
-
%
IOUT=167mA to/from 333mA
4
-
±400
±600
-
±400
±600
mV
Transition TIme=30µS
5,6
-
-
±750
-
-
-
mV
IOUT=167mA to/from 333mA
4
-
100
200
-
100
200
µS
Transition TIme=30µS
5,6
-
-
200
-
-
-
µS
VIN=16V to/from 40V
4
-
±200
±500
-
±200
±500
mV
Transition Time=30µS
5,6
-
-
±500
-
-
-
mV
VIN=16V to/from 40V
4
-
90
200
-
90
200
µS
Transition Time=30µS
5,6
-
-
200
-
-
-
µS
4
-
0
200
-
0
200
mV
5,6
-
0
200
-
-
-
mV
4
-
40
60
-
40
60
mS
5,6
-
-
60
-
-
-
mS
4
-
250
500
-
250
500
µS
5,6
-
-
500
-
-
-
µS
-
-
40
60
-
40
60
mS
POUT=5.4W MAX.
1,2,3
16
-
40
16
-
40
V
POUT=5W MAX.
1,2,3
11
-
50
11
-
50
V
Enabled, IOUT=0mA
1,2,3
-
35
50
-
35
50
mA
Disabled IOUT=0mA
1,2,3
-
1.25
2.5
-
1.25
2.5
mA
No Effect on DC Performance
1,2,3
-
-
300
-
-
300
µF
MΩ
Input to output or any pin to case @ 500V
Short Circuit Current Limit 7
Switching Frequency
VOUT Adjustment Range
Min.
-
Shutdown Recovery 2
Isolation
Max.
-
Shutdown Delay 2
Capacitive Load 2
Typ.
1
Start Up Delay
Quiescent Current
Units
Min.
2,3
BW=10KHz to 2MHz
Start Up Overshoot
Input Voltage Range 2
DAC2815S
mVrms
Efficiency
Step Load Response
DAC2815S H/E
RPOT=50KΩ
1
100
-
-
100
-
-
1
0.40
0.95
1.5
0.40
0.95
1.5
A
4
375
400
425
375
400
425
KHz
1
±10
-
-
±10
-
-
%
NOTES:
+VIN = 28V, IOUT = 333mA, TA=TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA=TC=+25°C
2, 5 TA=TC=+125°C
3, 6 TA=TC= -55°C
7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults.
8 Consult DSCC SMD for electrical parameters for devices purchased as such.
1
2
3
4
5
6
4
Rev. C 7/04
APPLICATION NOTES
POWER SUPPLIES
LOAD FAULT RESPONSE
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 converter such as but not limited to input voltage range, efficiency,
ripple and temperature performance will change. Characterization by the user is recommended in such applications.
The MSK families of DC-DC converters share load fault philosophies. Load fault conditions include short-circuit and severe overload conditions. The DAC2800S converter series responds to load faults by turning off all power conversion circuits for 250mS and then attempting to restart for 10mS (typical). The net "on" duty factor during a fault is very low resulting 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 converters.
Adjust/comp (pin 4) may be driven by external circuitry referenced 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 function is also required.
The comp function of pin 4 allows load transient response to
be tailored to suit specific application requirements. This feature 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 resistor 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
ETO-9.5
(±10% accuracy at 25°C)
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 converters 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 resistor >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
TYPICAL APPLICATION CIRCUIT
6
Rev. C 7/04
TYPICAL PERFORMANCE CURVES
DAC2812S
7
Rev. C 7/04
TYPICAL PERFORMANCE CURVES
DAC2815S
8
Rev. C 7/04
MECHANICAL SPECIFICATIONS
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
ORDERING INFORMATION
Part
Number
DAC2812S
DAC2812SE
DAC2812SH
5962-93093
5962-94631
DAC2815S
DAC2815SE
DAC2815SH
5962-93094
5962-94630
Screening
Level
Industrial
Extended Reliability
MIL-PRF-38534 Class H
DSCC-SMD
DSCC-SMD
Industrial
Extended Reliability
MIL-PRF-38534 Class H
DSCC-SMD
DSCC-SMD
Output
Voltage
12V
15V
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6572
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
9
Rev. C 7/04