F
EATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
–55°C to +125°C operation
16 to 40 VDC input
Fully isolated
Magnetic feedback
MODELS
Fixed frequency 550 kHz typ.
VDC O
UTPUT
Topology – Single Ended Forward
SINGLES
DUALS
Will withstand transients of
3.3
±3.3
up to 50 V for up to 120 msec.
5
±5
Output trim 60% to 110%
6.3
±6.3
Input and output side inhibit
9.5
±9.5
Remote sense
12
±12
15
±15
Synchronization
Parallel up to 5 units
Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) case U2
Output short circuit protection
Case U2 (flanged, short leads) and case Z (tabbed, leads bent down)
Up to 80 W/in
3
, 87% efficiency
are shown in the picture. Also available: flanged – leads bent down
(case V); tabbed – short leads (case Y) and leads bent up (case W).
See Section B8, cases U2, V, W, Y, and Z for dimensions and options.
Weight:
110 grams typical
Screening: Standard, ES, or 883 (Class H). See Section C2 for screening options,
see Section A5 for ordering information.
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MOR SERIES
120 WATT
DESCRIPTION
With up to 120 watts of output power, the MOR Series™ of DC/DC
converters operates from a standard 28 volt bus and offers a wide
input range of 16 to 40 VDC. Full operation over the military temper-
ature range, –55°C to +125°C, makes the MOR Series an ideal
choice for military, aerospace, space, and other high reliability appli-
cations. In compliance with MIL-STD-704D, the converters will with-
stand transients of up to 50 volts for up to 120 milliseconds. Use
Interpoint’s FME28-461 EMI filter to pass MIL-STD-461C, CE03
requirements.
The MOR Series converters incorporate a single-ended forward
topology which uses a constant frequency Pulse Width Modulator
1.7
µΗ
Positive
Input
6
µF
6
µF
0.1
Ω
Input
Common
0.015
µF
500 V
Bias
Supply
0.015
µF
500 V
Share
Function
FET
Driver
Secondary V
CC
V
S+
600
µF
100
Ω
600
µF
100
Ω
0.5
µΗ
3:2
(PWM) current mode control design and switches at 550 kHz,
nominal. The converters also provide short circuit protection by
restricting the current to 125% of the full load output current. All
models offer two inhibits, one referenced to input common and one
referenced to output common. A remote sense function is available
on single output models.
Using the trim function, the MOR Series can provide any output from
2 to 33 VDC. For example, trimming the two 15 volt outputs of the
15 dual (MOR2815D) to 14 volts, and then stacking the outputs will
provide a 28 volt output. See Figure 11.
1.3
µΗ
0.1
µΗ
Positive
Output
Positive
Sense
Sense
Return
Output
Common
Share
Inhibit 1
UVLO
V
In
PWM
Controller
+
_
+
_
V
Ref
Trim
Secondary V
CC
Sync In
Sync Out
Sync
In / Out
Inhibit 2
F
IGURE
1: S
IMPLIFIED
S
CHEMATIC
– MOR2805S, S
INGLE
5 V
OLT
O
UTPUT
– T
YPICAL
V
ALUES
1
MOR SERIES
120 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 VDC
Power Dissipation (Pd)
• 30 W
Output Power
• 66 to 120 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
DC/DC C
ONVERTERS
SYNC AND INHIBIT (INH1, INH2)
Sync In (525 to 625 kHz)
• Logic low 0.8 V max, duty cycle 15% to 50%
• Logic high 4.5 V min, 9 V max
• Referenced to input common
Sync Out - Referenced to input common
Inhibit (INH1, INH2) : TTL Open Collector
• Logic low (output disabled), V = 0.2 V max.
• INH1 referenced to input common
• INH2 referenced to output common
• Logic high (output enabled) open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Input to Output Capacitance
• 150 pF typical
Undervoltage Lockout
• 15.5 V input typical
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 40 dB typical
Conversion Frequency
• Free run mode 550 kHz typical
460 kHz. min, 570 kHz max
• External sync range 525 to 625 kHz
Inhibit Pin Voltage (unit enabled)
• INH1 = 13 V typ, INH2 = 8 V typ
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for 120 msec transient
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135° C
PINS NOT IN USE
Trim
Case
Inhibit (INH1, INH2)
Sync Out
Sync In
Share
Sense Lines
No connection
Users discrimination
No connection
No connection
Connect to input common
No connection
Must be connected to
appropriate outputs
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
CONDITION
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz - 20 MHz
Tc = –55°C to +125°C
10 kHz - 2 MHz
Tc = –55°C to +125°C
V
IN
= 16 to 40 VDC
NO LOAD TO FULL
CONTINUOUS
TRANSIENT 120 ms
NO LOAD
FULL LOAD
INHIBITED - INH1
INHIBITED - INH2
10 kHz - 20 MHz
Tc = –55°C to +125°C
POWER DISSIPATION
OVERLOAD
SHORT CIRCUIT
2
RECOVERY
OUTPUT CURRENT
TRIP POINT
SHORT CIRCUIT
2
50% – 100% – 50%
TRANSIENT
RECOVERY
3
16 – 40 – 16 VDC
TRANSIENT
4
RECOVERY
3
DELAY
OVERSHOOT
UNIT INHIBITED
MOR283R3S
MIN
3.25
0
0
—
—
—
—
16
—
—
—
—
—
—
74
—
—
—
—
—
—
—
—
—
—
—
—
TYP MAX
3.30 3.35
—
20
—
30
20
0
0
28
—
70
—
—
—
40
78
—
—
—
—
—
—
—
—
—
—
0
0.1
66
80
50
20
20
40
50
130
3.2
10
70
90
—
27
22
10
25
24
250
200
400
300
10
25
1.0
MOR2805S
MIN
4.95
0
0
—
—
—
—
16
—
—
—
—
—
—
78
—
—
—
—
—
—
—
—
—
—
—
—
TYP MAX
5.00 5.05
—
20
—
30
20
0
0
28
—
70
—
—
—
50
81
—
—
—
—
—
—
—
—
—
—
0
0.1
100
80
50
20
20
40
50
130
4.67
10
70
130
—
30
27
10
25
24
250
200
400
300
10
50
1.0
MOR286R3S
MIN
6.24
0
0
—
—
—
—
16
—
—
—
—
—
—
81
—
—
—
—
—
—
—
—
—
—
—
—
TYP MAX
6.30 6.36
—
16
—
75
50
0
0
28
—
70
—
—
—
50
83
—
—
—
—
—
—
—
—
—
—
0
0.1
100
100
60
20
20
40
50
130
4.45
10
70
100
—
30
24
10
20
19
500
300
500
300
10
50
1.0
MOR289R5S
MIN TYP MAX
9.40 9.50 9.60
0
—
11
0
—
—
—
—
16
—
—
—
—
—
—
81
—
—
—
—
—
—
—
—
—
—
—
—
—
75
50
0
0
28
—
70
—
—
—
50
84
—
—
—
—
—
—
—
—
—
—
0
0.1
105
120
80
20
20
40
50
130
4.63
10
70
130
—
30
24
10
14
13
500
300
500
300
10
50
1.0
UNITS
VDC
A
W
mV p-p
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
INPUT CURRENT
mV
mV
VDC
V
mA
A
mA
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
1
mA pp
%
W
ms
A
STEP LOAD RESP.
mV pk
µs
mV pk
µs
ms
mV pk
mA
STEP LINE RESP.
START-UP
INHIBIT PIN CURRENT
Notes: See notes 1, 2, 3, and 4 on the following page.
2
DC/DC C
ONVERTERS
SINGLE AND DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
5
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
+V
OUT
, ±V
OUT
LINE REGULATION
V
IN
= 16 to 40 VDC
LOAD REGULATION
CONDITIONS
+V
OUT
–V
OUT
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz - 20 MHz
Tc = –55°C to +125°C
10 kHz - 2 MHz
Tc = –55°C to +125°C
+V
OUT
–V
OUT
+V
OUT
–V
OUT
CROSS REGULATION
7
INPUT VOLTAGE
INPUT CURRENT
NEGATIVE V
OUT
CONTINUOUS
TRANSIENT 120 msec
NO LOAD
FULL LOAD
INHIBITED - INH1
INHIBITED - INH2
10 kHz - 20 MHz
Tc = –55°C to +125°C
POWER DISSIPATION
OVERLOAD
SHORT CIRCUIT
2
RECOVERY
OUTPUT CURRENT
TRIP POINT
STEP LOAD RESP.
+V
OUT
, ± V
OUT
STEP LINE RESP.
+V
OUT
, ± V
OUT
START-UP
INHIBIT PIN CURRENT
SHORT CIRCUIT
2
50% – 100% — 50%
TRANSIENT
RECOVERY
3
16 – 40 – 16 VDC
TRANSIENT
4
RECOVERY
3
DELAY
OVERSHOOT
UNIT INHIBITED
—
—
—
—
—
—
—
16
—
—
—
—
—
—
84
—
—
—
—
—
—
—
—
—
—
—
—
75
50
0
—
0
—
—
28
—
70
—
—
—
50
86
—
—
—
—
—
—
—
—
—
—
—
0.1
120
100
20
—
20
—
—
40
50
130
4.72
10
70
130
—
30
22
10
12
11
600
300
600
300
10
50
1.0
—
—
—
—
—
—
—
16
—
—
—
—
—
—
84
—
—
—
—
—
—
—
—
—
—
—
—
75
50
0
—
0
—
—
28
—
70
—
—
—
50
87
—
—
—
—
—
—
—
—
—
—
—
0.1
150
120
20
—
20
—
—
40
50
130
5.10
10
70
130
—
30
22
10
10
9
600
300
600
300
10
50
1.0
—
—
—
—
—
—
—
16
—
—
—
—
—
—
76
—
—
—
—
—
—
—
—
—
—
—
—
50
35
25
50
25
50
6
28
—
70
—
—
—
60
77
—
—
—
—
—
—
—
—
—
—
—
0.1
80
50
50
100
50
150
10
40
50
140
3.2
10
70
130
—
27
22
10
25
24
250
200
400
300
10
25
1.0
—
—
—
—
—
—
—
16
—
—
—
—
—
—
78
—
—
—
—
—
—
—
—
—
—
—
—
MOR2812S
MIN
—
0
—
TYP MAX
—
—
—
—
9.2
110
MOR2815S
MIN
—
0
—
TYP MAX
—
—
—
—
8
120
MOR283R3D
MIN
3.25
3.22
—
—
TYP MAX
3.30 3.35
3.30 3.38
±10
—
20
6
66
6
MOR SERIES
120 WATT
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
MOR2805D
MIN
TYP MAX
UNITS
VDC
A
W
11.88 12.00 12.12
14.85 15.00 15.15
4.95 5.00 5.05
4.92 5.00 5.08
—
—
±10
—
50
35
25
50
25
50
5
28
—
70
—
—
—
60
81
—
—
—
—
—
—
—
—
—
—
—
0.1
20
6
100
6
80
50
50
100
50
150
8
40
50
140
4.67
10
70
130
—
30
27
10
25
24
250
200
400
300
10
50
1.0
mV p-p
mV
mV
%
VDC
V
mA
A
mA
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
1
mA p-p
%
W
ms
A
mV pk
µs
mV pk
µs
ms
mV pk
mA
Notes:
1. Load fault conditions are measured with a resistive load.
2. Short circuit is measured with a 10 m W (±10%) load.
3. Time to settle to within 1% of Vout.
4. Transition time > 10 µs
5. Output voltage for dual output models is measured at half load.
6. The maximum specification is the total output current/power. Up to 70%
of that total is available from either output provided the other output
maintains a minimum of 15% the total power used.
7. Cross regulation percentages are for the following conditions:
+Po = 30% and –Po = 70%
+Po = 10% and –Po = 50%
+Po = 70% and –Po = 30%
+Po = 50% and –Po = 10%
3
MOR SERIES
120 WATT
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
5
OUTPUT CURRENT
6
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
+V
OUT
/ –V
OUT
LINE REGULATION
V
IN
= 16 to 40 VDC
LOAD REGULATION
CONDITIONS
+V
OUT
–V
OUT
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz - 20 MHz
Tc = –55°C to +125°C
10 kHz - 2 MHz
Tc = –55°C to +125°C
+V
OUT
–V
OUT
+V
OUT
–V
OUT
CROSS REGULATION
7
INPUT VOLTAGE
INPUT CURRENT
NEGATIVE V
OUT
CONTINUOUS
TRANSIENT 120 msec
NO LOAD
FULL LOAD
INHIBITED - INH1
INHIBITED - INH2
10 kHz - 20 MHz
Tc = –55°C to +125°C
POWER DISSIPATION
OVERLOAD
SHORT CIRCUIT
2
RECOVERY
OUTPUT CURRENT
TRIP POINT
SHORT CIRCUIT
2
50% – 100% — 50%
TRANSIENT
RECOVERY
3
16 – 40 – 16 VDC
TRANSIENT
4
RECOVERY
3
TIME
OVERSHOOT
UNIT INHIBITED
DC/DC C
ONVERTERS
MOR286R3D
MIN
6.24
6.20
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
—
81
—
—
—
—
—
—
—
—
—
—
—
—
TYP MAX
6.30 6.36
6.30 6.40
±8
—
50
30
25
50
25
50
5
28
—
70
—
—
—
—
83
—
—
—
—
—
—
—
—
—
—
—
0.1
16
100
100
60
50
160
50
200
8
40
50
140
4.45
10
70
130
—
30
24
10
20
19
500
300
500
300
10
50
1.0
MOR289R5D
MIN
9.40
9.35
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
—
82
—
—
—
—
—
—
—
—
—
—
—
—
TYP MAX
9.50 9.60
9.50 9.65
±5.53 11.05
—
75
50
25
50
25
50
4
28
—
70
—
—
—
—
84
—
—
—
—
—
—
—
—
—
—
—
0.1
105
120
80
50
100
50
200
7
40
50
140
4.63
10
70
130
—
30
24
10
14
13
500
300
600
300
10
50
1.0
MOR2812D
MIN
TYP MAX
MOR2815D
MIN
TYP MAX
UNITS
VDC
A
6
W
Electrical Characteristics: Tc = 25°C, full load, Vin = 28 VDC, free run, unless otherwise specified.
11.88 12.00 12.12
11.80 12.00 12.20
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
—
84
—
—
—
—
—
—
—
—
—
—
—
—
±4.58 9.16
—
75
50
25
50
25
50
3
28
—
70
—
—
—
—
86
—
—
—
—
—
—
—
—
—
—
—
0.1
110
120
100
50
100
50
200
5
40
50
140
4.72
10
70
130
—
30
22
10
11
10
600
300
600
300
10
50
1.0
14.85 15.00 15.15
14.76 15.00 15.24
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
—
85
—
—
—
—
—
—
—
—
—
—
—
—
±4.00 8.00
—
75
50
25
50
25
50
2
28
—
70
—
—
—
—
87
—
—
—
—
—
—
—
—
—
—
—
0.1
120
150
120
50
100
50
200
4
40
50
140
5.10
10
70
130
—
30
20
10
10
9
600
300
750
300
10
50
1.0
mV p-p
mV
mV
%
VDC
V
mA
A
mA
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
1
mA p-p
%
W
ms
A
STEP LOAD RESP.
± V
OUT
STEP LINE RESP.
± V
OUT
START-UP
INHIBIT PIN CURRENT
mV pk
µs
mV pk
µs
ms
mV pk
mA
Notes:
1. Load fault conditions are measured with a resistive load.
2. Short circuit is measured with a 10 m W (±10%) load.
3. Time to settle to within 1% of Vout.
4. Transition time > 10 µs
5. Output voltage for dual output models is measured at half load.
6. The maximum specification is the total output current/power. Up to 70%
of that total is available from either output provided the other output
maintains a minimum of 15% the total power used.
7. Cross regulation percentages are for the following conditions:
+Po = 30% and –Po = 70%
+Po = 10% and –Po = 50%
+Po = 70% and –Po = 30%
+Po = 50% and –Po = 10%
4
DC/DC C
ONVERTERS
PIN DESCRIPTIONS AND FUNCTIONS
P
IN
O
UT
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Single Output
Positive Input
Input Common
Trim
Inhibit 1(INH1)
Sync Out
Sync In
Positive Output
Output Common
Sense Return
Positive Sense
Share
Inhibit 2 (INH2)
Dual Output
Positive Input
Input Common
Case
Inhibit 1(INH1)
Sync Out
Sync In
Positive Output
Output Common
Negative Output
Trim
Share
Inhibit 2 (INH2)
MOR SERIES
120 WATT
3
Trim
T
RIM
Both single and dual output
models include a trim function.
Output voltage can be trimmed
from 60% up to 110% of nominal
V out . When trimming up, do not
exceed the maximum output
power. When trimming down, do
not exceed the maximum output
current.
Trim Formulas
Trim Up:
α
=
V
o
V
o nominal
V
o
2.5 – 1 • 20 – 50
(α -1)
Example: V
o nominal
= 5.0
,
V
o
= 5.25
,
α
= 1.05
,
R
T
= 390 kΩ
V
o
,
0.6
≤ α ≤
1.0
Trim Down:
α
=
V
o nominal
MOR
Single
Output
R
T
Positive Output 7
Positive Sense 10
TRIM UP
Sense Return
Output Common
9
8
TRIM
DOWN
F
IGURE
3: T
RIM
– S
INGLE
10 Trim
Positive Output
R
T
7
TRIM UP
MOR
Dual
Output
Output Common
8
TRIM DOWN
,
1.0
≤ α ≤
1.1
Negative Output
9
(
R
T
(kΩ) =
)
F
IGURE
4: T
RIM
– D
UAL
On dual models the positive
output is regulated and the
negative output is transformer
coupled (cross-regulated) to the
positive output. When trimming
the duals, both output voltages
will be adjusted equally.
R
T
(kΩ) = 50 •
α
– 30
1–
α
P
OSITIVE
I
NPUT AND
I
NPUT
C
OMMON
Steady state voltage range is 16 to 40 VDC. Transient range is 40
to 50 V for a maximum of 120 msec. Low voltage lockout prevents
the units from operating below approximately 15.5 VDC input
voltage to keep system current levels smooth, especially during
initialization or re-start operations. All models include a soft-start
function to prevent large current draw and minimize overshoot.
Example: V
o nominal
= 5.0
,
V
o
= 4.5
,
α
= 0.9
,
R
T
= 150 kΩ
I
NHIBIT
1
AND
2
Two inhibit terminals disable switching, resulting in no output and
very low quiescent input current. The two inhibit pins allow access
to an inhibit function on either side of the isolation barrier to help
maintain isolation.
An open collector is
Positive
Input
required for inter-
200
Ω
facing with both of
the inhibit pins.
20 k
Applying an open-
10 k
collector TTL logic
12 V
V
CC
low to either inhibit
Inhibit 1
pin will inhibit the
Input
converter. Applying
Common
MOR Input Side
an open collector
F
IGURE
5: I
NHIBIT
– I
NPUT
S
IDE
TTL logic high or
leaving the pins
open will enable the converter. Inhibit 1 is referenced to Input
Common, while Inhibit 2 is referenced to Sense Return on the
output side.
Current
Limit
V
S
~
10 k
Voltage
E/A
C
ASE AND
E
XTERNAL
I
NPUT
F
ILTERS
Internal 500 V capacitors are connected between the case and
input common and between the case and output common. See
Figure 1.
Interpoint’s FME filters are recommended to meet CE03 require-
ments for reflected input line current. When using an external
input filter it is important that the case of the filter and the case of
the converter be connected through as low as an impedance as
possible. Direct connection of the baseplates to chassis ground is
the best connection. If connected by a single trace, the trace
should be as wide as it is long.
1, 2, 3
Positive Input
Positive Output 10, 11, 12
1 Positive Input
28V
FME28-461
EMI Filter
4, 5, 6
Input Common
Output Common
7, 8, 9
Case*
MOR
Single or Dual
Output
2 Input Common
200
Ω
Feedback
Inhibit 2
Sense
Return
MOR Output Side
Chassis Ground
F
IGURE
2: E
XTERNAL
F
ILTER
C
ONNECTION
The
open
circuit
voltage for Inhibit 1 is
13 V and for Inhibit 2 it
is 8 V. Float the inhibit
pin(s) if not used. The
required logic low
voltage level is 0.2 V
maximum.
F
IGURE
6: I
NHIBIT
– O
UTPUT
S
IDE
5
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