HI-REL DESIGN
WAVE SOLDERABLE PACKAGE
ALL CERAMIC CAPACITORS
SURFACE MOUNT MAGNETICS
FEATURES -- DUAL OUTPUT
REPLACES APEX DHC2812D & DHC2815D
BOTH OUTPUTS FULLY REGULATED
NO DERATING -- 55C TO +125C
HIGH ISOLATION -- 500V
TRACKING OUPUT V ADJUSTMENT --
STANDARD
REMOTE SHUTDOWN
11 TO 50V INPUT WITH 5 WATT OUTPUT
AVAILABLE WITH 12V OR 15V OUTPUTS
DESCRIPTION
The DAC2800D series of DC-DC converters provides the
ruggedness reliability and features required to meet the ad-
vanced 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 DAC2800D hybrid converter series utilizes all ceramic
capacitors, surface mount magnetics, and ultrasonically
bonded wires to provide reliable operation at all operating
temperatures while surviving G forces of up to 500 G.
The DAC2800D series has two fully regulated tracking
outputs. 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 both out-
puts 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 elimi-
nates 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.
TYPICAL APPLICATION
BLOCK DIAGRAM
EXTERNAL CONNECTIONS
P W M
FEED FORWARD
CONTROLLER
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
4
3
1
2
6
5
7
PASS
4707 Dey Road Liverpool, N.Y. 13088
M.S.KENNEDY CORP.
(315) 701-6751
DAC2800D
SERIES
ISO-9001 CERTIFIED BY DSCC
6W
DUAL DC-DC
CONVERTERS
Rev. A 3/01
1
1
2
3
4
5
+OUTPUT
OUTPUT COMMON
-OUTPUT
ADJUST/COMP
SHUTDOWN PLUS
8
7
6
CASE
-INPUT
+INPUT
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812D DAC2815D
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
1
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
STEADY STATE
CHARACTERISTICS
INPUT VOLTAGE RANGE
55C
125C
11
28
50
11
28
50
Vdc
OUTPUT VOLTAGE (+/)
+I
o
= I
o
= 10%
11.9
12
12.1
14.9
15
15.1
Vdc
OUTPUT CURRENT 55C
125C
V
IN
= 16
40
225
360
4
180
288
4
mAdc
V
IN
= 11
50
208
333
4
167
267
4
mAdc
OUTPUT POWER 55C
125C
V
IN
= 16
40
5.4
5.4
W
V
IN
= 11
50
5
5
W
EFFICIENCY
+I
o
= I
o
= 100%
60
64
61
65
%
LINE REGULATION
V
IN
= 11
50; +I
o
= I
o
= 100%
5
5
mV
LOAD REGULATION
+ (+I
o
= 0 160%)
I
o
= 40%
2
5
5
mV
(-I
o
= 0 160%)
+I
o
= 40%
2
20
15
mV
OPERATING TEMPERATURE, CASE
55
125
55
125
C
TEMPERATURE COEFFICIENT
(Vout +/)
0.006
0.006
%/C
INPUT RIPPLE CURRENT
Bandwidth = 10kHz
1MHz
340
340
mArms
WITH 1H SERIES INDUCTANCE
Bandwidth = 10kHz
1MHz
45
45
mArms
OUTPUT RIPPLE VOLTAGE
Bandwidth = 10kHz
1MHz
15
60
15
60
mVrms
LOAD CAPACITANCE
3
(PER OUTPUT
V
IN
= 16
40
100
100
F
OVER 55C
125C)
V
IN
= 11
50
50
50
F
SHORT CIRCUIT DISSIPATION
0.5
0.5
W
QUIESCENT INPUT CURRENT
50
70
50
70
mA
INHIBITED
0.9
1.25
2.5
0.09
1.25
2.5
mA
ISOLATION CHARACTERISTICS
(INPUT/OUTPUT/CASE)
LEAKAGE RESISTANCE
500 Vdc
100
100
M
LEAKAGE CAPACITANCE
10kHz
400
500
400
500
pF
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE
V
IN
= 16
40 Vdc
VOLTAGE CHANGE
200
200
mV
RECOVERY TIME (99%)
250
250
S
WITH 50 F OUTPUT
CAPACITORS
3
VOLTAGE CHANGE
150
150
mV
RECOVERY TIME (99%)
400
400
S
LOAD STEP RESPONSE
+I
o
= I
o
= 50
100%
VOLTAGE CHANGE
400
400
mV
RECOVERY TIME (99%)
200
200
S
WITH 50 F OUTPUT
CAPACITORS
3
VOLTAGE CHANGE
300
300
mV
RECOVERY TIME (99%)
300
300
S
START-UP OVERSHOOT
V
IN
= 0
28 Vdc
0
0
mV
SHUTDOWN DELAY
Pin 5 = >10
<8 Vdc
250
500
250
500
S
SHUTDOWN RECOVERY
Pin 5 = > 8
<10Vdc
40
60
40
60
mS
DAC2812D
DAC2812D
DAC2812D
DAC2812D
DAC2812D
DAC2815D
DAC2815D
DAC2815D
DAC2815D
DAC2815D
ABSOLUTE MAXIMUM RATINGS
DAC2812D
DAC2812D
DAC2812D
DAC2812D
DAC2812D
DAC2815D
DAC2815D
DAC2815D
DAC2815D
DAC2815D
INPUT VOLTAGE RANGE (Pin 7 to 6 or 5)
50Vdc
50Vdc
INPUT TRANSIENT (Pin 7 to 6)
80V @ 50ms
80V @ 50ms
OUTPUT CURRENT (Continuous)
360mA
4
288mA
4
TEMPERATURE, Storage
65C, 150C
65C, 150C
TEMPERATURE, Pin Soldering 10s
300C
300C
Rev. A 3/01
2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812D DAC2815D
NOTES:
1.
Unless otherwise stated T
C
= 25, V
IN
= 28V, I
o
= +I
o
= 100%,
2.
Regulation measured on output pins 1/16" from case. I
o
= 100% means 2.5 or 2.7 watts.
3.
Capacitors should be connected from + to common and to common only.
Capacitance value imbalance should not be more than 4:1.
4.
Up to 80% of total load may be drawn from either output.
PACKAGE & THERMAL SPECIFICATIONS
MIN
TYP
MAX
UNITS
WEIGHT
14
GRAMS
TEMPERATURE RISE, junction to case
17
25
C
TEMPERATURE RISE, ambient
30
C/W
Rev. A 3/01
3
TYPICAL PERFORMANCE
GRAPHS
DAC2812D
0
1
5
6
OUTPUT CURRENT, P
OUT
(W)
10
11
12
13
14
15
16
LOW LINE DROP OUT
INPUT VOLTAGE, V
IN
(V)
2
3
4
10K
90K
60K
20K
30K 40K
INPUT VOLTAGE, V
IN
(V)
LINE TRANSIENT RESPONSE
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT POWER, P
OUT
(W)
4
1
2
3
5
SET POINT RESISTOR, R
SP
(
)
TIME, t (10msec/DIV)
12
16
20
24
28
TURN ON THRESHOLD
TURN ON VOLTAGE, E
TO
(V)
TURN ON RESPONSE
FREQUENCY, f (Hz)
100
AUDIO REJECTION
AUDIO REJECTION, A
V
(dB)
0
20
40
1K
10K
100K
60
80
RESPONSE, X (UNITS/DIV)
+12V
0V
12V
+V
OUT
V
IN
TEMP = 25
C
40%
50%
55%
60%
63%
66%
65%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT CURRENT, P
OUT
(W)
TEMP = 125
C
40%
50%
55%
58%
60%
62%
63%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT POWER, P
OUT
(W)
5
2
1
3
4
5
2
1
3
4
TEMP =
55
C
40%
50%
55%
67%
59%
62%
65%
TIME, t (100
sec/DIV)
TIME, t (100
sec/DIV)
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT LOAD = 225mA
OUTPUT LOAD = 225mA
NO OUTPUT BUS CAPACITANCE
NO OUTPUT CAPACITANCE
INCLUDES 50
F ON
EACH OUTPUT
TIME, t (100
sec/DIV)
+ LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
360mA
360mA
+LOAD
LOAD
+V
OUT
+V
OUT
+V
OUT
V
IN
16V
V
OUT
90mA
90mA
1 V
2 A
1V
1V
100mA
500mV
500mV
20V
10 V
2
V
NO OUTPUT BUS CAPCITANCE
V
IN
= 28V
I
OUT
= 225 mA
OUTPUT DC CURRENT RATING
V
OUT
LOAD = 90mA
V
OUT
+LOAD = 90mA
40V
+V
OUT
28V
Rev. A 3/01
4
TYPICAL PERFORMANCE
GRAPHS
DAC2815D
0
5
6
OUTPUT POWER, P
OUT
(W)
10
11
12
13
14
15
16
LOW LINE DROP OUT
INPUT VOLTAGE, V
IN
(V)
1
2
3
4
10K
90K
70K
20K
30K 40K50K
INPUT VOLTAGE, V
IN
(V)
LINE TRANSIENT RESPONSE
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT CURRENT, P
OUT
(W)
5
1
2
3
4
SET POINT RESISTOR, R
SP
(
)
TIME, t (10msec/DIV)
12
16
20
24
28
TURN ON THRESHOLD
TURN ON VOLTAGE, E
TO
(V)
TURN ON RESPONSE
FREQUENCY, f (Hz)
100
AUDIO REJECTION
AUDIO REJECTION, A
V
(dB)
0
20
40
1K
10K
100K
60
80
RESPONSE, X (UNITS/DIV)
+15V
0V
0V
15V
28V
+V
OUT
V
OUT
V
IN
TEMP = 25
C
40%
55%
62%
50%
63%
65%
66%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT CURRENT, P
OUT
(W)
5
1
2
3
4
TEMP =
125
C
40%
50%
62%
52%
56%
59%
61%
INPUT VOLTAGE, V
IN
(V)
EFFICIENCY CONTOURS
15
30
40
35
20
25
OUTPUT CURRENT, I
OUT
(A)
3.2
.8
1.6
2.4
4
TEMP =
55
C
40%
50%
55%
60%
64%
71%
66%
68%
70%
69%
TIME, t (100
sec/DIV)
TIME, t (100
sec/DIV)
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
NO OUTPUT BUS CAPACITANCE
NO OUTPUT CAPACITANCE
INCLUDES 50
F ON EACHOUTPUT
TIME, t (100
sec/DIV)
LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
288mA
LOAD = 72mA
288mA
72mA
72mA
V
OUT
V
OUT
+V
OUT
V
OUT
+V
OUT
V
IN
OUTPUT LOAD = 182mA
+LOAD
LOAD
1 V
1 A
1 V
1 A
500mV
500mV
20V
10 V
2
V
NO OUTPUT BUS CAPCITANCE
V
IN
= 28V
I
OUT
= 182mA
OUTPUT DC CURRENT RATING
V
OUT
OUTPUT LOAD =182mA
+ LOAD = 72mA
Rev. A 3/01
5
DAC2812D DAC2815D
APPLICATION
INFORMATION
OUTPUT ADJUST / COMP
The output voltage of the DAC2800D may be adjusted from
90% to 110% of nominal value by the use of a 150K( potenti-
ometer 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 tem-
perature performance will change. Characterization by the
user is recommended in such applications.
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
1.3 V 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 10K( 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 10nF or less capacitor
between pins 4 and 1.
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 pin 7 (-input).
Shutdown may be implemented by simply connecting pin 5
to an open collector logic output or switch rated at 2.5 mA, 25
Vdc 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 * 10
3
E
TO
9.5
(+/ 10% accuracy at 25
O
C)
Set point temperature coefficient is typically + 400ppm/
O
C
Output fault monitoring is accomplished by observing pin 5
with a high impedance monitoring circuit. Pin 5 voltage drops
from over 10 V to below 1 V when a load fault causes the
converter's fault protection circuitry to activate. It will remain
4
1
2
150K
10nF
low for at least 100 mS and return high. If the load fault is still
present pin 5 will return low and the cycle will repeat. A resistor
> 400K( from pin 5 to 7 provides pull down for pin 5 if there is
no input setpoint programming resistor already in place.
LOAD FAULT RESPONSE
The DAC2800D series of DC-DC converters share load
fault philosophies. Load fault conditions include short-circuit
and severe overload conditions. The DAC2800D converter
series responds to load faults by turning off all power conver-
sion circuits for 250 mS and then attempting to restart for 10
mS (typical). The net "on" duty factor during a fault is very low
resulting in low converter dissipation and immunity from
overheating at 125C. 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.
Vo
NORMAL
TIME
NORMAL
LOAD FAULT
O
I
o
O
Rev. A 3/01
6
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.
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
NOTE: ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
DAC2812D
The above example is an industrial grade 12V dual output converter
ORDERING INFORMATION
SCREENING
BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY;
H= CLASS H; K= CLASS K
DUAL OUTPUT
OUTPUT VOLTAGE
12=12V; 15=15V
NOMINAL INPUT VOLTAGE
GENERAL PART NUMBER
Rev. A 3/01
7
MECHANICAL SPECIFICATIONS
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