ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
6W
DC-DC
CONVERTERS
4707 Dey Road Liverpool, N.Y. 13088
DHC2800S
SERIES
(315) 701-6751
MIL-PRF-38534 CERTIFIED
FEATURES:
70% Typical Efficiency
All Ceramic Capacitors
Surface Mount Magnetics
Withstands 5000G
MIL STD 461C CE03 (With EFJ2803 Filter)
80 Volt Input Transient Tolerent
No Derating - -55°C to +125°C
Wide Supply Range - 10V to 50V
High Isolation - 500V
High Power Density - 17W/in³
Output Voltage Adjustment - Standard
Remote Shutdown
Operates to 11V Input at 5W
Available with 3.3V or 5V Outputs
See DAC2800s Series for 12V and 15V Versions
Available to DSCC SMD 5962-94629 and 5962-93092
DESCRIPTION:
The DHC2800S series of DC-DC converters provides the ruggedness, reliability and features required to
meet the advanced design challenges of today's hi-rel market. The use of advanced substrate and reflow
soldering techniques during construction results in a rugged, cost-effective and completely solderable package.
DHC2800S hybrid converter series utilizes all ceramic capacitors and surface mount magnetics to
provide reliable operation at all operating temperatures while surviving very high G forces.
DHC2800S 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 is also standard.
Fault tolerant design protects these converters from most external circuit faults. The output and output
adjust pins will withstand +35V while the shutdown pin will withstand +50V protecting the converters
from a variety of system or board faults i.e. 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 forward converter topology operating at a switching frequency of 400kHz allows
operation over a wide input voltage range. Internal filtering of both input and output eliminates the need for
external capacitors in many applications.
The 8-pin DIP package is hermetically sealed and isolated from the internal circuits. Heat sinking is
recommended for full power operation at elevated ambient temperatures.
1
Rev. F 9/05
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
+50V
VIN Input Voltage (pin 7 to pin 6)
Input
Transient
(pin
7
to
pin
6
@
50mS)
80V
VINT
Output
Current
IOUT
DHC2803S
2.0A
DHC2805S
1.5A
Case
Temperature
Range
TC
DHC2800S H/E
-55°C to +125°C
DHC2800S
-40°C to +85°C
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8 Case
7 -Input
6 +Input
1
ABSOLUTE MAXIMUM RATINGS
○
+Output
-Output
Adjust/Comp
NC
Shutdown Plus
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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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6.5°C/W
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NOTE:
1 Continuous operation at or above absolute maximum ratings may adversely effect the
performance and/or life cycle.
2
Rev. F 9/05
ELECTRICAL SPECIFICATIONS
DHC2803S
Parameter 8
Group A
Subgroup
Test Conditions 1
Step Load Recovery
Step Line Response 2
Step Line Recovery 2
3.18
3.30
3.42
VDC
3.45
-
-
-
VDC
1
152
-
1520
152
-
1520
mA
2,3
152
-
1520
-
-
-
mA
1
152
-
1820
152
-
1820
mA
2,3
152
-
1820
-
-
-
mA
1
-
85
190
-
85
190
mVp-p
2,3
-
-
475
-
-
-
mVp-p
1
-
165
200
-
165
225
mAp-p
2,3
-
-
200
-
-
-
mAp-p
1
-
±6
±15
-
±6
±20
mV
2,3
-
-
±50
-
-
-
mV
VIN=16V, 28V and 40V
1
-
±10
±25
-
±10
±30
mV
IOUT=0A, 0.9A and 1.8A
2,3
-
-
±50
-
-
-
mV
1
61
66
-
61
66
-
%
2,3
58
-
-
-
-
-
%
IOUT=0.9A to/from 1.8A
4
-
±430
±600
-
±430
±650
mV
BW=10KHz to 2MHz
BW=10KHz to 2MHz
VIN=16V to 40V
Transition TIme=30µS
5,6
-
-
±850
-
-
-
mV
IOUT=0.9A to/from 1.8A
4
-
85
300
-
85
300
µS
Transition TIme=30µS
5,6
-
-
300
-
-
-
µS
VIN=16V to/from 40V
4
-
±190
±500
-
±190
±500
mV
Transition Time=30µS
5,6
-
-
±500
-
-
-
mV
VIN=16V to/from 40V
4
-
120
500
-
120
500
µS
Transition Time=30µS
5,6
-
-
500
-
-
-
µS
4
-
0
200
-
0
200
mV
5,6
-
0
200
-
-
-
mV
4
-
30
50
-
30
50
mS
5,6
-
-
50
-
-
-
mS
4
-
220
500
-
220
500
µS
5,6
-
-
500
-
-
-
µS
-
-
60
-
-
60
-
mS
POUT=6W MAX.
1,2,3
12
-
50
12
-
50
V
POUT=5W MAX.
1,2,3
11
-
50
11
-
50
V
POUT=2.5W MAX.
1,2,3
10
-
50
10
-
50
V
Enabled, IOUT=0mA
1,2,3
-
35
40
-
35
45
mA
mA
Shutdown Delay 2
Shutdown Recovery 2
Capacitive Load 2
Isolation
Max.
3.40
Start Up Delay
Quiescent Current
Typ.
-
Start Up Overshoot
Input Voltage Range 2
Min.
3.30
Efficiency
Step Load Response
Max.
3.15
16V≤VIN≤50V
Load Regulation
Typ.
3.20
Output Current 2
Line Regulation
Units
Min.
1
12V≤VIN≤50V
Input Current Ripple 2
DHC2803S
2,3
Output Voltage
Output Voltage Ripple
DHC2803S H/E
Disabled IOUT=0mA
1,2,3
-
2
5
-
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
2.3
2.8
3.6
2.3
2.8
3.6
A
Switching Frequency
4
375
400
425
350
400
450
KHz
1
±10
-
-
±10
-
-
%
VOUT Adjustment Range
RPOT=50KΩ
NOTES:
+VIN = 28V, IOUT = 1.8A for DHC2803S, IOUT = 1.0A for DHC2805S, 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 Refer to DSCC SMD for electrical specifications for devices purchased as such.
1
2
3
4
5
6
3
Rev. F 9/05
ELECTRICAL SPECIFICATIONS
DHC2805S
Parameter 8
Group A
Subgroup
Test Conditions 1
Step Load Recovery
Step Line Response 2
Step Line Recovery 2
Start Up Overshoot
Start Up Delay
Capacitive Load 2
Isolation
Max.
5.05
4.90
5.00
5.10
VDC
5.20
-
-
-
VDC
1
120
-
1200
120
-
1200
mA
2,3
120
-
1200
-
-
-
mA
1
120
-
1500
120
-
1500
mA
2,3
120
-
1500
-
-
-
mA
1
-
75
190
-
75
190
mVp-p
2,3
-
-
475
-
-
-
mVp-p
1
-
100
200
-
100
225
mAp-p
2,3
-
-
200
-
-
-
mAp-p
1
-
±6
±15
-
±6
±20
mV
2,3
-
-
±50
-
-
-
mV
VIN=16V, 28V and 40V
1
-
±10
±25
-
±10
±30
mV
IOUT=0A, 0.5A and 1A
2,3
-
-
±50
-
-
-
mV
1
64
70
-
64
70
-
%
2,3
62
-
-
-
-
-
%
IOUT=500mA to/from 1000mA
4
-
±300
±500
-
±300
±500
mV
BW=10KHz to 2MHz
BW=10KHz to 2MHz
VIN=16V to 40V
Transition TIme=30µS
5,6
-
-
±750
-
-
-
mV
IOUT=500mA to/from 1000mA
4
-
90
300
-
90
300
µS
Transition TIme=30µS
5,6
-
-
300
-
-
-
µS
VIN=16V to/from 40V
4
-
±160
±500
-
±160
±500
mV
Transition Time=30µS
5,6
-
-
±500
-
-
-
mV
VIN=16V to/from 40V
4
-
140
500
-
140
500
µS
Transition Time=30µS
5,6
-
-
500
-
-
-
µS
4
-
0
200
-
0
200
mV
5,6
-
0
200
-
-
-
mV
4
-
30
50
-
30
50
mS
5,6
-
-
50
-
-
-
mS
4
-
220
500
-
220
500
µS
5,6
-
-
500
-
-
-
µS
-
-
60
-
-
60
-
mS
POUT=6W MAX.
1,2,3
12
-
50
12
-
50
V
POUT=5W MAX.
1,2,3
11
-
50
11
-
50
V
POUT=2.5W MAX.
1,2,3
10
-
50
10
-
50
V
Enabled, IOUT=0mA
1,2,3
-
35
40
-
35
45
mA
mA
IOUT=1A
IOUT=0A and 1A
Shutdown Recovery 2
Quiescent Current
Typ.
-
Shutdown Delay 2
Input Voltage Range 2
Min.
5.00
Efficiency
Step Load Response
Max.
4.80
16V≤VIN≤50V
Load Regulation
Typ.
4.95
Output Current 2
Line Regulation
Units
Min.
1
12V≤VIN≤50V
Input Current Ripple 2
DHC2805S
2,3
Output Voltage
Output Voltage Ripple
DHC2805S H/E
Disabled IOUT=0mA
1,2,3
-
2
5
-
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
1.6
1.9
2.2
1.5
1.9
2.3
A
Switching Frequency
4
375
400
425
350
400
450
KHz
1
±10
-
-
±10
-
-
%
VOUT Adjustment Range
RPOT=50KΩ
NOTES:
1
2
3
4
5
6
+VIN = 28V, IOUT = 1.8A for DHC2803S, IOUT = 1.0A for DHC2805S, 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 Refer to DSCC SMD for electrical specifications for devices purchased as such.
4
Rev. F 9/05
APPLICATION NOTES
POWER SUPPLIES
LOAD FAULT RESPONSE
The output voltage of the DHC2800S may be adjusted from
90% to 110% of nominal value by the use of a 50KΩ 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 DHC2800S series of dc-dc converters share load fault
philosophies. Load fault conditions include short-circuit and
severe overload conditions. The DHC2800S 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 3) may be driven by external circuitry referenced to pin 2 (-output) if desired. Grounding pin 3 causes
voltage to increase (25% typically) while driving pin 3 above
1.3V causes output voltage to decrease. Pin 3 may be driven
through 10KΩ or more if connection of the comp function is
also required.
The comp function of pin 3 allows capacitive loads as large
as 1000µF to be accommodated on the DHC2805S without
loss of stability. This feature may be utilized by connecting a
10nF capacitor between pins 3 and 1. This is generally recommended when low ESR load capacitances of 100µF or greater
are used.
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 -input (pin 7).
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. F 9/05
TYPICAL APPLICATION CIRCUIT
6
Rev. F 9/05
TYPICAL PERFORMANCE CURVES
DHC2803S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
65%
20
1V
LOAD TRANSIENT RESPONSE 1000µF
VOUT
1.8A
500mA
OUTPUT RESPONSE, X
(UNITS/DIV)
VOUT
(1V/DIV)
.9A
IOUT
INCLUDES 1000µF ON OUTPUT BUS
1V
VOUT
1.8A
500mA
OUTPUT RESPONSE, X
(UNITS/DIV)
VOUT
(1V/DIV)
0.5
1.0
1.5
2.0
OUTPUT CURRENT, IOUT (A)
LOAD TRANSIENT RESPONSE
.9A
IOUT
NO OUTPUT BUS CAPCITANCE
LINE TRANSIENT RESPONSE
VOUT
40V
16V
VIN
TIME, t (200µsec/DIV)
TURN ON THRESHOLD
TURN ON RESPONSE
12
10K
20K 30K 40K 60K 90K
SET POINT RESISTOR, RSP (Ω)
RESPONSE, XV(UNITS/DIV)
OUT(1V/DIV)
10 V
1V
16
11
.18 .36
.72
1.08
1.44
1.8
OUTPUT CURRENT, IOUT (A)
LOAD TRANSIENT RESPONSE 100µF
LINE TRANSIENT RESPONSE
VOUT
28V
INCLUDES 100µF ON
OUTPUT BUS
TIME, t (5msec/DIV)
7
VOUT
80V
11V
VIN
TIME, t (200µsec/DIV)
3.3V
0V VIN
.9A
IOUT
INCLUDES 100µF ON OUTPUT BUS
LOAD 1.8A
0V
VOUT
1.8A
0
28
20
65%
66%
TIME, t (200µsec/DIV)
TIME, t (500µsec/DIV)
24
20
TIME, t (100µsec/DIV)
OUTPUT RESPONSE, V
XOUT
(UNITS/DIV)
(50mV/DIV)
10V
50mV
INPUT VOLTAGE, VIN (V)
OUTPUT DC
CURRENT RATING
12
64%
67%
68%
11
.18 .36
.72
1.08
1.44
1.8
OUTPUT CURRENT, IOUT (A)
LOW LINE DROP OUT
14
62%
30
68%
70%
16
66%
67%
INPUT VOLTAGE, VIN (V)
69%
63%
60%
1V
20
60%
55%
500mA
68%
30
50%
40
100mV
67%
55%
TEMP =
125°C
30%
40%
20V
30
50%
OUT(1V/DIV)
OUTPUT RESPONSE, XV(UNITS/DIV)
63%
65%
40
(100mV/DIV)
OUTPUT RESPONSE, V
XOUT
(UNITS/DIV)
60%
TEMP = –55°C
40%
AUDIO REJECTION, A V (dB)
50%
55%
40
11
.18 .36
.72
1.08
1.44
1.8
OUTPUT CURRENT, IOUT (A)
TURN ON VOLTAGE, ETO (V)
50
30%
TEMP = 25°C
40%
10
0.0
EFFICIENCY CONTOURS
50
30%
INPUT VOLTAGE, VIN (V)
INPUT VOLTAGE, VIN (V)
50
–20
AUDIO REJECTION
VIN = 28V
IOUT = 2.0A
–40
–60
–80
–100
100 200 400 1K 2K 4K 10K 20K 40K 100K
FREQUENCY, f (Hz)
Rev. F 9/05
TYPICAL PERFORMANCE CURVES
DHC2805S
EFFICIENCY CONTOURS
EFFICIENCY CONTOURS
30%
TEMP = 25°C
40%
50%
55%
40
60%
30
65%
68%
70%
71%
20
TEMP = –55°C
40%
40
50%
55%
30
60%
63%
66%
20
68%
69%
TEMP =
125°C
50%
55%
40
60%
63%
30
66%
20
68%
69%
70%
70%
LOAD TRANSIENT RESPONSE 100µF
500mA
1.2A
IOUT
600mA
INCLUDES 1000µF ON OUTPUT BUS
LINE TRANSIENT RESPONSE
LOAD = 1.2A
VOUT
40V
16V
VIN
INCLUDES 100µF ON OUTPUT BUS
TIME, t (200µsec/DIV)
TURN ON THRESHOLD
TURN ON RESPONSE
16
12
10K
20K 30K 40K 60K 90K
SET POINT RESISTOR, RSP (Ω)
RESPONSE, XV(UNITS/DIV)
OUT(2V/DIV)
10 V
2V
20
INCLUDES 100µF ON OUTPUT BUS
VOUT
28V
0V VIN
INCLUDES 100µF ON OUTPUT BUS
8
LOAD = 1.2A
VIN
11V
TIME, t (200µsec/DIV)
5.0V
TIME, t (5msec/DIV)
VOUT
80V
LOAD = 1.2A
0V
INCLUDES 100µF ON OUTPUT BUS
LINE TRANSIENT RESPONSE
0
28
600mA
IOUT
TIME, t (200µsec/DIV)
TIME, t (500µsec/DIV)
24
500mA
TIME, t (100µsec/DIV)
100mV
VOUT
VOUT
1.2A
20V
1V
LOAD TRANSIENT RESPONSE 1000µF
NO OUTPUT BUS CAPCITANCE
(100mV/DIV)
OUTPUT RESPONSE, V
XOUT
(UNITS/DIV)
0.4
0.8
1.2
1.6
OUTPUT CURRENT, IOUT (A)
600mA
IOUT
AUDIO REJECTION, A V (dB)
10
0.0
1.2A
500mA
12
OUTPUT RESPONSE, V
XOUT
(UNITS/DIV)
(50mV/DIV)
10V
50mV
OUTPUT DC
CURRENT RATING
14
VOUT
1V
LOAD TRANSIENT RESPONSE
OUT(1V/DIV)
OUTPUT RESPONSE, XV(UNITS/DIV)
LOW LINE DROP OUT
1V
11
.12 .24
.48
.78
.96
1.2
OUTPUT CURRENT, IOUT (A)
OUTPUT RESPONSE, X
(UNITS/DIV)
VOUT
(1V/DIV)
11
.12 .24
.48
.78
.96
1.2
OUTPUT CURRENT, IOUT (A)
TEMP = 25°C
INPUT VOLTAGE, VIN (V)
30%
40%
11
.12 .24
.48
.78
.96
1.2
OUTPUT CURRENT, IOUT (A)
16
OUTPUT RESPONSE, V
X OUT
(UNITS/DIV)
(1V/DIV)
INPUT VOLTAGE, VIN (V)
30%
50
72%
TURN ON VOLTAGE, ETO (V)
EFFICIENCY CONTOURS
50
INPUT VOLTAGE, VIN (V)
INPUT VOLTAGE, VIN (V)
50
–20
AUDIO REJECTION
VIN = 28V
IOUT = 1.2A
–40
–60
–80
–100
100 200 400 1K 2K
10K 20K
FREQUENCY, f (Hz)
100K
Rev. F 9/05
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT= 14.5 GRAMS TYPICAL
CONTAINS INTERNAL BeO (BERYLLIUM OXIDE)
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED
ORDERING INFORMATION
Part
Number
DHC2803S
DHC2803SE
DHC2803SH
DHC2805S
DHC2805SE
DHC2805SH
5962-93092
5962-94629
Screening Level
Output
Voltage
Industrial
Extended Reliability
Mil-PRF-38534 Class H
Industrial
Extended Reliability
Mil-PRF-38534 Class H
DSCC-SMD for DHC2805S
DSCC-SMD for DHC2805S
3.3V
5.0V
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. F 9/05