MOR283R3S datasheet(2/24 Pages) INTERPOINT

2 / 24 page

HoW to use tHe Functions

inPut Voltage

Steady state voltage range is 16 to 40 VDC. Transient range

is 40 to 50 V for a maximum of 120 msec. All models include

a soft-start function to prevent large current draw and minimize

overshoot.

emi inPut FilterS

Internal 500 volt capacitors are connected between the case and

input common and between the case and output common.

Use Interpoint’s FMCE-1528 EMI filter to meet the requirements

of MIL-STD-461C CE03 and CS01 and/or MIL-STD-461D, E and

F CE102 and CS101 levels of conducted emissions. 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. See Figure

trim

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. See Figure 2.

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. See Figure 3.

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

FMCE-1528

EMI Filter

Positive Output

Output Common

Figure 1: external Filter ConneCtion

3 Trim

Positive Output

Positive Sense

Sense Return

Output Common

MOR

Single

Output

TRIM UP

TRIM

DOWN

Figure 2: trim – Single

10 Trim

TRIM UP

TRIM DOWN

MOR

Dual

Output

Positive Output

Output Common

Negative Output

Figure 3: trim – dual

Vo nominal

50 • a – 30

1 – a

Trim Up:

a =

, 1.0 ≤ a ≤ 1.1

RT (kΩ) =

– 50

Example:

Vo nominal = 5.0, Vo = 5.25, a = 1.05, RT = 390 kΩ

Trim Down:

a =

, 0.6 ≤ a ≤ 1.0

RT (kΩ) =

Example: Vo nominal = 5.0,Vo = 4.5, a = 0.9, RT = 150 kΩ

Vo nominal

( –1)•20

(a -1)

2.5

trim FormulaS

Crane Aerospace & Electronics Power Solutions

Mor single and dual dc/dc converters

28 Volt input – 120 Watt

www.interpoint.com

Page 2 of 24

MOR Rev K - 20100422

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