ISO-9001 CERTIFIED BY DSCC
6W
DUAL DC-DC
CONVERTERS
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
DAC2800D
SERIES
(315) 701-6751
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
TYPICAL APPLICATION
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.
1
BLOCK DIAGRAM
6
1
2
5
PWM
FEED FORWARD
CONTROLLER
PASS
3
7
ERROR AMPLIFIER
REFERENCE AND
ISOLATION
4
EXTERNAL CONNECTIONS
1
2
3
4
5
+OUTPUT
OUTPUT COMMON
-OUTPUT
ADJUST/COMP
SHUTDOWN PLUS
8 CASE
7 -INPUT
6 +INPUT
Rev. B 12/03
DAC2812D • DAC2815D
ABSOLUTE MAXIMUM RATINGS
INPUT VOLTAGE RANGE (Pin 7 to 6 or 5)
INPUT TRANSIENT (Pin 7 to 6)
OUTPUT CURRENT (Continuous)
TEMPERATURE, Storage
TEMPERATURE, Pin Soldering 10s
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812D
50Vdc
80V @ 50ms
360mA
4
–65°C,150°C
300°C
DAC2815D
50Vdc
80V @ 50ms
288mA
4
–65°C,150°C
300°C
SPECIFICATIONS
PARAMETER
STEADY STATE
CHARACTERISTICS
INPUT VOLTAGE RANGE
OUTPUT VOLTAGE (+/–)
OUTPUT CURRENT –55°C
×
125°C
OUTPUT POWER –55°C
×
125°C
EFFICIENCY
LINE REGULATION
LOAD REGULATION
+(+I
o
=0–160%)
– (-I
o
= 0 – 160%)
OPERATING TEMPERATURE, CASE
TEMPERATURE COEFFICIENT
(Vout +/–)
INPUT RIPPLE CURRENT
WITH 1µH SERIES INDUCTANCE
OUTPUT RIPPLE VOLTAGE
LOAD CAPACITANCE
3
(PER OUTPUT
OVER –55°C
×
125°C)
SHORT CIRCUIT DISSIPATION
QUIESCENT INPUT CURRENT
INHIBITED
ISOLATION CHARACTERISTICS
(INPUT/OUTPUT/CASE)
LEAKAGE RESISTANCE
LEAKAGE CAPACITANCE
DYNAMIC CHARACTERISTICS
LINE STEP RESPONSE
VOLTAGE CHANGE
RECOVERY TIME (99%)
WITH 50 µF OUTPUT
CAPACITORS
3
VOLTAGE CHANGE
RECOVERY TIME (99%)
LOAD STEP RESPONSE
VOLTAGE CHANGE
RECOVERY TIME (99%)
WITH 50 µF OUTPUT
CAPACITORS
3
VOLTAGE CHANGE
RECOVERY TIME (99%)
START-UP OVERSHOOT
SHUTDOWN DELAY
SHUTDOWN RECOVERY
500 Vdc
10kHz
–55°C
↔
125°C
+I
o
=–I
o
=10%
V
IN
= 16
↔
40
V
IN
= 11
↔
50
V
IN
= 16
↔
40
V
IN
= 11
↔
50
+I
o
=–I
o
=100%
V
IN
= 11
↔
50; +I
o
= –I
o
= 100%
–I
o
=40%
2
+I
o
=40%
2
TEST CONDITIONS
1
DAC2812D
MIN
TYP
MAX
DAC2815D
MIN
TYP
MAX
UNITS
11
11.9
28
12
±2
25
±0
28
50
12.1
360
4
333
4
5.4
5
11
14.9
28
15
±8
10
±6
17
50
15.1
288
4
267
4
5.4
5
60
64
5
5
20
61
65
5
5
15
Vdc
Vdc
mAdc
mAdc
W
W
%
mV
mV
mV
°C
%/°C
mArms
mArms
mVrms
µF
µF
W
mA
mA
–55
0.006
340
45
15
125
–55
0.006
340
45
15
125
Bandwidth = 10kHz
→
1MHz
Bandwidth = 10kHz
→
1MHz
Bandwidth = 10kHz
→
1MHz
V
IN
= 16
↔
40
V
IN
= 11
↔
50
60
100
50
70
2.5
60
100
50
70
2.5
0.9
0.5
50
1.25
0.09
0.5
50
1.25
100
400
500
100
400
500
MΩ
pF
V
IN
= 16
↔
40 Vdc
200
250
200
250
mV
µS
150
400
+I
o
=–I
o
=50
↔
100%
400
200
150
400
400
200
mV
µS
mV
µS
V
IN
= 0
→
28 Vdc
Pin 5 = >10
↔
<8 Vdc
Pin 5 = > 8
↔
<10Vdc
300
300
0
250
40
500
60
300
300
0
250
40
500
60
mV
µS
mV
µS
mS
2
Rev. B 12/03
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
DAC2812D • DAC2815D
NOTES:
1.
2.
3.
4.
Unless otherwise stated T
C
= 25°, V
IN
= 28V, –I
o
= +I
o
= 100%,
Regulation measured on output pins 1/16" from case. I
o
= 100% means 2.5 or 2.7 watts.
Capacitors should be connected from + to common and – to common only.
Capacitance value imbalance should not be more than 4:1.
Up to 80% of total load may be drawn from either output.
PACKAGE & THERMAL SPECIFICATIONS
WEIGHT
TEMPERATURE RISE, junction to case
TEMPERATURE RISE, ambient
MIN
TYP
14
17
30
MAX
UNITS
GRAMS
°
C
°C/W
25
3
Rev. B 12/03
PCB Design
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