Page 1
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 — –55°C TO +125°C
• 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 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 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 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 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 3/011
1
2
3
4
5
+OUTPUT
OUTPUT COMMON
-OUTPUT
ADJUST/COMP
SHUTDOWN PLUS
8
7
6
CASE
-INPUT
+INPUT
Page 2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812D • DAC2815D
SPECIFICATIONS
PARAMETER TEST CONDITIONS
1
MIN TYP MAX MIN TYP MAX UNITS
STEADY STATE
CHARACTERISTICS
INPUT VOLTAGE RANGE –55°C ↔ 125°C 11 28 50 11 28 50 Vdc
OUTPUT VOLTAGE (+/–) +Io = –Io = 10% 11.9 12 12.1 14.9 15 15.1 Vd c
OUTPUT CURRENT –55°C × 125°C VIN = 16 ↔ 40 ±225 360
4
±180 2884mAdc
VIN = 11 ↔ 50 ±208 333
4
±167 2674mAdc
OUTPUT POWER –55°C × 125°C VIN = 16 ↔ 40 5.4 5.4 W
VIN = 11 ↔ 50 5 5 W
EFFICIENCY +Io = –Io= 100% 60 64 61 65 %
LINE REGULATION VIN = 11 ↔ 50; +Io = –Io = 100% 5 5 mV
LOAD REGULATION
+ (+Io= 0 – 160%) –Io = 40%
2
55mV
– (-Io= 0 – 160%) +Io = 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 1µH SERIES INDUCTANCE Bandwidth = 10kHz → 1MHz 45 45 mArms
OUTPUT RIPPLE VOLTAGE Bandwidth = 10kHz → 1MHz 15 60 15 60 mVrms
LOAD CAPACITANCE3 (PER OUTPUT VIN = 16 ↔ 40 100 100 µF
OVER –55°C × 125°C) VIN = 11 ↔ 50 50 50 µF
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 MΩ
LEAKAGE CAPACITANCE 10kHz 400 500 400 500 pF
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE VIN = 16 ↔ 40 Vdc
VOLTAGE CHANGE 200 200 mV
RECOVERY TIME (99%) 250 250 µS
WITH 50 µF OUTPUT
CAPACITORS
3
VOLTAGE CHANGE 150 150 mV
RECOVERY TIME (99%) 400 400 µS
LOAD STEP RESPONSE +Io= –Io= 50 ↔ 100%
VOLTAGE CHANGE 400 400 mV
RECOVERY TIME (99%) 200 200 µS
WITH 50 µF OUTPUT
CAPACITORS
3
VOLTAGE CHANGE 300 300 mV
RECOVERY TIME (99%) 300 300 µS
START-UP OVERSHOOT VIN = 0 → 28 Vdc 0 0 mV
SHUTDOWN DELAY Pin 5 = >10 ↔ <8 Vdc 250 500 250 500 µS
SHUTDOWN RECOVERY Pin 5 = > 8 ↔ <10Vdc 40 60 40 60 mS
DAC2812DDAC2812D
DAC2812DDAC2812D
DAC2812D
DAC2815DDAC2815D
DAC2815DDAC2815D
DAC2815D
ABSOLUTE MAXIMUM RATINGS
DAC2812DDAC2812D
DAC2812DDAC2812D
DAC2812D
DAC2815DDAC2815D
DAC2815DDAC2815D
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 –65°C, 150°C –65°C, 150°C
TEMPERATURE, Pin Soldering 10s 300°C 300°C
Rev. A 3/01
2
Page 3
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812D • DAC2815D
NOTES: 1. Unless otherwise stated TC = 25°, VIN = 28V, –Io= +Io= 100%,
2. Regulation measured on output pins 1/16" from case. Io= 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
Page 4
TYPICAL PERFORMANCE
GRAPHS
DAC2812D
01 56
OUTPUT CURRENT, P
OUT
(W)
10
11
12
13
14
15
16
LOW LINE DROP OUT
INPUT VOLTAGE, V
IN
(V)
234
10K 90K60K20K 30K 40K
INPUT VOLTAGE, V
IN
(V)
LINE TRANSIENT RESPONSE
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT POWER, P
OUT
(W)
4123 5
SET POINT RESISTOR, R
SP
(Ω)
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)
52134
52134
TEMP =
–55°C
40%
50%
55%
67%
59%
62%
65%
TIME, t (100µsec/DIV)
TIME, t (100µsec/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 50µF ON
EACH OUTPUT
TIME, t (100µsec/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 V2 A
1V 1V100mA
500mV500mV20V
10 V 2 V
NO OUTPUT BUS CAPCITANCE
VIN = 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
Page 5
TYPICAL PERFORMANCE
GRAPHS
DAC2815D
056
OUTPUT POWER, P
OUT
(W)
10
11
12
13
14
15
16
LOW LINE DROP OUT
INPUT VOLTAGE, V
IN
(V)
1234
10K 90K70K20K 30K 40K50K
INPUT VOLTAGE, V
IN
(V)
LINE TRANSIENT RESPONSE
EFFICIENCY CONTOURS
30
50
40
10
20
OUTPUT CURRENT, P
OUT
(W)
51234
SET POINT RESISTOR, R
SP
(Ω)
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)
51234
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 (100µsec/DIV)
TIME, t (100µsec/DIV)
– LOAD TRANSIENT RESPONSE
OUTPUT RESPONSE, X (UNITS/DIV)
OUTPUT RESPONSE, X (UNITS/DIV)
NO OUTPUT BUS CAPACITANCE
NO OUTPUT CAPACITANCE
INCLUDES 50µF ON EACHOUTPUT
TIME, t (100µsec/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 V1 A
1 V1 A
500mV500mV20V
10 V 2 V
NO OUTPUT BUS CAPCITANCE
VIN = 28V
I
OUT
= 182mA
OUTPUT DC CURRENT RATING
–V
OUT
OUTPUT LOAD =182mA
+ LOAD = 72mA
Rev. A 3/01
5
Page 6
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( 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.
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 25OC)
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 conversion 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 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.
V
o
NORMAL
TIME
NORMALLOAD FAULT
O
I
o
O
Rev. A 3/016
Page 7
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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