MOR SERIES

120 WATT

DC/DC C

ONVERTERS

28 V

OLT

NPUT

Positive

Input

Common

Output
Common

Positive
Output

100

Positive
Sense

Sense
Return

Secondary V

S+

Function

Ref

Trim

Secondary V

Inhibit 2

PWM

Controller

Sync

In / Out

UVLO

Sync In

Sync Out

FET

Driver

Bias

Supply

Inhibit 1

1.7

0.5

1.3

0.1

3:2

µF

0.1

µF

0.015

µF

500 V

0.015

µF

500 V

600

µF

600

µF

EATURES

· 55°C to +125°C operation
· 16 to 40 VDC input
· Fully isolated
· Magnetic feedback
· Fixed frequency 550 kHz typ.
· Topology Single Ended Forward
· Will withstand transients of

up to 50 V for up to 120 msec.

· Output trim 60% to 110%
· Input and output side inhibit
· Remote sense
· Synchronization
· Parallel up to 5 units
· Output short circuit protection
· Up to 80 W/in

, 87% efficiency

MODELS

VDC O

UTPUT

DESCRIPTION

With up to 120 watts of output power, the MOR SeriesTM 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

(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.

SINGLES

3.3

6.3
9.5

12
15

DUALS

±3.3

±5

±6.3
±9.5

±12
±15

Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) case U2

Case U2 (flanged, short leads) and case Z (tabbed, leads bent down)
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.

IGURE

1: S

IMPLIFIED

CHEMATIC

 MOR2805S, S

INGLE

5 V

OLT

UTPUT

 T

YPICAL

ALUES

TYPICAL CHARACTERISTICS

SYNC AND INHIBIT (INH1, INH2)

PINS NOT IN USE

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

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

MOR SERIES
120 WATT

DC/DC C

ONVERTERS

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

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

Notes: See notes 1, 2, 3, and 4 on the following page.

SINGLE OUTPUT MODELS

MOR283R3S

MOR2805S

MOR286R3S

MOR289R5S

PARAMETER

CONDITION

MIN TYP MAX

MIN

TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

3.25

3.30

3.35

4.95

5.00

5.05

6.24

6.30

6.36

9.40

9.50 9.60

VDC

OUTPUT CURRENT

= 16 to 40 VDC

OUTPUT POWER

= 16 to 40 VDC

100

105

OUTPUT RIPPLE

10 kHz - 20 MHz

VOLTAGE

Tc = 55°C to +125°C

100

120

mV p-p

10 kHz - 2 MHz

Tc = 55°C to +125°C

LINE REGULATION

= 16 to 40 VDC

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 120 ms

INPUT CURRENT

NO LOAD

130

FULL LOAD

3.2

4.67

4.45

4.63

INHIBITED - INH1

INHIBITED - INH2

INPUT RIPPLE

10 kHz - 20 MHz

CURRENT

Tc = 55°C to +125°C

130

100

130

mA pp

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

OVERLOAD

SHORT CIRCUIT

RECOVERY

OUTPUT CURRENT

TRIP POINT

SHORT CIRCUIT

STEP LOAD RESP.

50% 100% 50%

TRANSIENT

250

500

mV pk

RECOVERY

200

300

µs

STEP LINE RESP.

16 40 16 VDC

TRANSIENT

400

500

mV pk

RECOVERY

300

µs

START-UP

DELAY

OVERSHOOT

mV pk

INHIBIT PIN CURRENT

UNIT INHIBITED

0.1

1.0

0.1

1.0

0.1

1.0

0.1

1.0

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

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.

MOR SERIES

120 WATT

DC/DC C

ONVERTERS

SINGLE AND DUAL OUTPUT MODELS

MOR2812S

MOR2815S

MOR283R3D

MOR2805D

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

OUT

11.88 12.00 12.12

14.85 15.00 15.15

3.25

3.30

3.35

4.95

5.00

5.05

VDC

OUT

3.22

3.30

3.38

4.92

5.00

5.08

OUTPUT CURRENT

= 16 to 40 VDC

9.2

±10

OUTPUT POWER

= 16 to 40 VDC

110

120

100

OUTPUT RIPPLE

10 kHz - 20 MHz

VOLTAGE

Tc = 55°C to +125°C

120

150

mV p-p

OUT

, ±V

OUT

10 kHz - 2 MHz

Tc = 55°C to +125°C

100

120

LINE REGULATION

OUT

= 16 to 40 VDC

OUT

100

LOAD REGULATION

OUT

150

CROSS REGULATION

NEGATIVE V

OUT

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 120 msec

INPUT CURRENT

NO LOAD

130

140

FULL LOAD

4.72

5.10

3.2

4.67

INHIBITED - INH1

INHIBITED - INH2

INPUT RIPPLE

10 kHz - 20 MHz

CURRENT

Tc = 55°C to +125°C

130

mA p-p

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

OVERLOAD

SHORT CIRCUIT

RECOVERY

OUTPUT CURRENT

TRIP POINT

SHORT CIRCUIT

STEP LOAD RESP.

50% 100% -- 50%

OUT

, ± V

OUT

TRANSIENT

600

250

mV pk

RECOVERY

300

200

µs

STEP LINE RESP.

16 40 16 VDC

OUT

, ± V

OUT

TRANSIENT

600

400

mV pk

RECOVERY

300

µs

START-UP

DELAY

OVERSHOOT

mV pk

INHIBIT PIN CURRENT

UNIT INHIBITED

0.1

1.0

0.1

1.0

0.1

1.0

0.1

1.0

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%

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.

MOR SERIES
120 WATT

DC/DC C

ONVERTERS

DUAL OUTPUT MODELS

MOR286R3D

MOR289R5D

MOR2812D

MOR2815D

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

OUT

6.24

6.30

6.36

9.40

9.50

9.60

11.88 12.00 12.12

14.85 15.00 15.15

VDC

OUT

6.20

6.30

6.40

9.35

9.50

9.65

11.80 12.00 12.20

14.76 15.00 15.24

OUTPUT CURRENT

= 16 to 40 VDC

±8

±5.53 11.05

±4.58 9.16

±4.00 8.00

OUTPUT POWER

= 16 to 40 VDC

100

105

110

120

OUTPUT RIPPLE

10 kHz - 20 MHz

VOLTAGE

Tc = 55°C to +125°C

100

120

150

mV p-p

OUT

/ V

OUT

10 kHz - 2 MHz

Tc = 55°C to +125°C

100

120

LINE REGULATION

OUT

= 16 to 40 VDC

OUT

160

100

LOAD REGULATION

OUT

200

CROSS REGULATION

NEGATIVE V

OUT

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 120 msec

INPUT CURRENT

NO LOAD

140

FULL LOAD

4.45

4.63

4.72

5.10

INHIBITED - INH1

INHIBITED - INH2

INPUT RIPPLE

10 kHz - 20 MHz

CURRENT

Tc = 55°C to +125°C

130

mA p-p

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

OVERLOAD

SHORT CIRCUIT

RECOVERY

OUTPUT CURRENT

TRIP POINT

SHORT CIRCUIT

STEP LOAD RESP.

50% 100% -- 50%

± V

OUT

TRANSIENT

500

600

mV pk

RECOVERY

300

µs

STEP LINE RESP.

16 40 16 VDC

± V

OUT

TRANSIENT

500

600

750

mV pk

RECOVERY

300

µs

START-UP

TIME

OVERSHOOT

mV pk

INHIBIT PIN CURRENT

UNIT INHIBITED

0.1

1.0

0.1

1.0

0.1

1.0

0.1

1.0

Electrical Characteristics: Tc = 25°C, full load, Vin = 28 VDC, free run, unless otherwise specified.

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%

PIN DESCRIPTIONS AND FUNCTIONS

OSITIVE

NPUT AND

NPUT

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.

ASE AND

XTERNAL

NPUT

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.

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.

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.

NHIBIT

AND

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
required for inter-
facing with both of
the inhibit pins.
Applying an open-
collector TTL logic
low to either inhibit
pin will inhibit the
converter. Applying
an open collector
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.

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.

Pin

Single Output

Dual Output

Positive Input

Input Common

Trim

Case

Inhibit 1(INH1)

Sync Out

Sync In

Positive Output

Output Common

Sense Return

Negative Output

Positive Sense

Trim

Inhibit 2 (INH2)

MOR SERIES

120 WATT

DC/DC C

ONVERTERS

20 k

200

10 k

Positive

Input

Inhibit 1

Input

Common

MOR Input Side

12 V

IGURE

5: I

NHIBIT

 I

NPUT

IDE

10 k

200

Current

Limit

Feedback

Voltage

E/A

Inhibit 2

Sense
Return

MOR Output Side

IGURE

6: I

NHIBIT

 O

UTPUT

IDE

Positive Input

2 Input Common

MOR

Single or Dual

Output

10, 11, 12

7, 8, 9

Case*

Chassis Ground

Positive Input

1, 2, 3

4, 5, 6

28V

Input Common

FME28-461

EMI Filter

Positive Output

Output Common

IGURE

2: E

XTERNAL

ILTER

ONNECTION

Trim

Positive Output

Positive Sense

Sense Return

Output Common

MOR

Single

Output

TRIM UP

TRIM
DOWN

IGURE

3: T

RIM

 S

INGLE

10 Trim

TRIM UP

TRIM DOWN

MOR

Dual

Output

Positive Output

Output Common

Negative Output

IGURE

4: T

RIM

 D

UAL

Trim Down:

0.6

1.0

o nominal

Example: V

o nominal

= 5.0

= 4.5

= 0.9

= 150 k

) = 50 · 30

Trim Up:

1.0

1.1

o nominal

Example: V

o nominal

= 5.0

= 5.25

= 1.05

= 390 k

) =

(

)

· 20

(

-1)

2.5

Trim Formulas

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MOR2812D/883