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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

Output trim 60% to 110%

6.3

±6.3

Input and output side inhibit

9.5

±9.5

Remote sense

±12

±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

, 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

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

µF

0.1

Ω

Input

Common

0.015

µF

500 V

Bias

Supply

0.015

µF

500 V

Function

FET

Driver

Secondary 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

Return

Output

Common

Inhibit 1

UVLO

PWM

Controller

Ref

Trim

Secondary V

Sync In

Sync Out

Sync

In / Out

Inhibit 2

IGURE

1: S

IMPLIFIED

CHEMATIC

– MOR2805S, S

INGLE

5 V

OLT

UTPUT

– T

YPICAL

ALUES

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

Sense Lines

No connection

Users discrimination

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

= 16 to 40 VDC

10 kHz - 20 MHz

Tc = –55°C to +125°C

10 kHz - 2 MHz

Tc = –55°C to +125°C

= 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

RECOVERY

OUTPUT CURRENT

TRIP POINT

SHORT CIRCUIT

50% – 100% – 50%

TRANSIENT

RECOVERY

16 – 40 – 16 VDC

TRANSIENT

RECOVERY

DELAY

OVERSHOOT

UNIT INHIBITED

MOR283R3S

MIN

3.25

—

TYP MAX

3.30 3.35

—

0.1

130

3.2

—

250

200

400

300

1.0

MOR2805S

MIN

4.95

—

TYP MAX

5.00 5.05

—

0.1

100

130

4.67

130

—

250

200

400

300

1.0

MOR286R3S

MIN

6.24

—

TYP MAX

6.30 6.36

—

0.1

100

130

4.45

100

—

500

300

500

300

1.0

MOR289R5S

MIN TYP MAX

9.40 9.50 9.60

—

0.1

105

120

130

4.63

130

—

500

300

500

300

1.0

UNITS

VDC

mV p-p

LINE REGULATION

LOAD REGULATION

INPUT VOLTAGE

INPUT CURRENT

VDC

INPUT RIPPLE

CURRENT

EFFICIENCY

LOAD FAULT

mA pp

STEP LOAD RESP.

mV pk

µs

mV pk

µs

mV pk

STEP LINE RESP.

START-UP

INHIBIT PIN CURRENT

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

DC/DC C

ONVERTERS

SINGLE AND DUAL OUTPUT MODELS

PARAMETER

OUTPUT VOLTAGE

OUTPUT CURRENT

OUTPUT POWER

OUTPUT RIPPLE

VOLTAGE

OUT

, ±V

OUT

LINE REGULATION

= 16 to 40 VDC

LOAD REGULATION

CONDITIONS

OUT

–V

OUT

= 16 to 40 VDC

10 kHz - 20 MHz

Tc = –55°C to +125°C

10 kHz - 2 MHz

Tc = –55°C to +125°C

OUT

–V

OUT

–V

OUT

CROSS REGULATION

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

RECOVERY

OUTPUT CURRENT

TRIP POINT

SHORT CIRCUIT

50% – 100% — 50%

TRANSIENT

RECOVERY

16 – 40 – 16 VDC

TRANSIENT

RECOVERY

DELAY

OVERSHOOT

UNIT INHIBITED

—

0.1

120

100

—

130

4.72

130

—

600

300

600

300

1.0

—

0.1

150

120

—

130

5.10

130

—

600

300

600

300

1.0

—

0.1

100

150

140

3.2

130

—

250

200

400

300

1.0

—

MOR2812S

MIN

—

TYP MAX

—

9.2

110

MOR2815S

MIN

—

TYP MAX

—

120

MOR283R3D

MIN

3.25

3.22

—

TYP MAX

3.30 3.35

3.30 3.38

±10

—

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

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

—

0.1

100

150

140

4.67

130

—

250

200

400

300

1.0

mV p-p

VDC

INPUT RIPPLE

CURRENT

EFFICIENCY

LOAD FAULT

mA p-p

STEP LOAD RESP.

OUT

, ± V

OUT

STEP LINE RESP.

OUT

, ± V

OUT

START-UP

INHIBIT PIN CURRENT

mV pk

µs

mV pk

µs

mV pk

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%

MOR SERIES

120 WATT

DUAL OUTPUT MODELS

PARAMETER

OUTPUT VOLTAGE

OUTPUT CURRENT

OUTPUT POWER

OUTPUT RIPPLE

VOLTAGE

OUT

/ –V

OUT

LINE REGULATION

= 16 to 40 VDC

LOAD REGULATION

CONDITIONS

OUT

–V

OUT

= 16 to 40 VDC

10 kHz - 20 MHz

Tc = –55°C to +125°C

10 kHz - 2 MHz

Tc = –55°C to +125°C

OUT

–V

OUT

–V

OUT

CROSS REGULATION

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

RECOVERY

OUTPUT CURRENT

TRIP POINT

SHORT CIRCUIT

50% – 100% — 50%

TRANSIENT

RECOVERY

16 – 40 – 16 VDC

TRANSIENT

RECOVERY

TIME

OVERSHOOT

UNIT INHIBITED

DC/DC C

ONVERTERS

MOR286R3D

MIN

6.24

6.20

—

TYP MAX

6.30 6.36

6.30 6.40

±8

—

0.1

100

160

200

140

4.45

130

—

500

300

500

300

1.0

MOR289R5D

MIN

9.40

9.35

—

TYP MAX

9.50 9.60

9.50 9.65

±5.53 11.05

—

0.1

105

120

100

200

140

4.63

130

—

500

300

600

300

1.0

MOR2812D

MIN

TYP MAX

MOR2815D

MIN

TYP MAX

UNITS

VDC

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

—

±4.58 9.16

—

0.1

110

120

100

200

140

4.72

130

—

600

300

600

300

1.0

14.85 15.00 15.15

14.76 15.00 15.24

—

±4.00 8.00

—

0.1

120

150

120

100

200

140

5.10

130

—

600

300

750

300

1.0

mV p-p

VDC

INPUT RIPPLE

CURRENT

EFFICIENCY

LOAD FAULT

mA p-p

STEP LOAD RESP.

± V

OUT

STEP LINE RESP.

± V

OUT

START-UP

INHIBIT PIN CURRENT

mV pk

µs

mV pk

µs

mV pk

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%

DC/DC C

ONVERTERS

PIN DESCRIPTIONS AND FUNCTIONS

Single Output

Positive Input

Input Common

Trim

Inhibit 1(INH1)

Sync Out

Sync In

Positive Output

Output Common

Sense Return

Positive Sense

Inhibit 2 (INH2)

Dual Output

Positive Input

Input Common

Case

Inhibit 1(INH1)

Sync Out

Sync In

Positive Output

Output Common

Negative Output

Trim

Inhibit 2 (INH2)

MOR SERIES

120 WATT

Trim

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:

o nominal

2.5 – 1 • 20 – 50

(α -1)

Example: V

o nominal

= 5.0

= 5.25

= 1.05

= 390 kΩ

0.6

≤ α ≤

1.0

Trim Down:

o nominal

MOR

Single

Output

Positive Input 7

Positive Sense 10

TRIM UP

Sense Return

Output Common

TRIM

DOWN

IGURE

3: T

RIM

– S

INGLE

10 Trim

Positive Input

TRIM UP

MOR

Dual

Output

Output Common

TRIM DOWN

1.0

≤ α ≤

1.1

Negative Output

(

(kΩ) =

)

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.

(kΩ) = 50 •

– 30

1–

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.

OSITIVE

NPUT

Example: V

o nominal

= 5.0

= 4.5

= 0.9

= 150 kΩ

NHIBIT

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.

ASE

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

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

low to either inhibit

Inhibit 1

pin will inhibit the

Input

converter. Applying

Common

MOR Input Side

an open collector

IGURE

5: I

NHIBIT

– I

NPUT

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

10 k

Voltage

E/A

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

IGURE

2: E

XTERNAL

ILTER

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.

IGURE

6: I

NHIBIT

– O

UTPUT

IDE