MOR283R3D datasheet(3/24 Pages) INTERPOINT

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inhibit 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 required for interfacing with both of the

inhibit pins. Applying an active low to either inhibit pin will inhibit

the converter. Leaving the pins open will enable the converter.

Inhibit 1 is referenced to Input Common. Inhibit 2 is refer-

enced to Sense Return for single output models and to Output

Common for dual output models.

The open circuit voltage (unit enabled) for Inhibit 1 is 13 V

and for Inhibit 2 it is up to 8 V. Leave the Inhibit pins uncon-

nected if not used. The required active low voltage level is 0.8

V maximum for Inhibit 1 and 0.2 V maximum for Inhibit 2. See

Figures 4 and 5.

underVoltage loCkout

Undervoltage 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 opera-

tions.

SynC in and SynC out

The MOR converters can be synchronized to the system clock

by applying an active high sync signal to the Sync In pin. Sync

Out can be used to synchronize other components to the MOR

converter’s switching frequency.

The frequency range for external synchronization is 525 to 625

kHz. The requirements for an external signal are 15% to 50%

dutycycle,0≤L≤0.8Vand4.5≤H≤9V.BothSyncInand

Sync Out are referenced to input common. Sync In should be

connected to input common if not used. See Figures 6 and 7.

PoSitiVe outPut, negatiVe outPut and

outPut Common

Output current is typically limited to 125% of maximum specified

current under short circuit or load fault conditions.

Single output models operate from no load to full load. Dual

output models with balanced loads operate from no load to full

load. For dual models with unbalanced loads, at least 10% of

the total output power must be drawn from the positive output

at all times, however, the negative output does not require a

minimum load. See note 4, cross regulation, under the Electrical

Characteristics Tables.

Sync In

Input

Common

330 pF

1.8 k

10 k

1 k

Figure 6: SynC in

Sync Out

Input

Common

200 Ω

Figure 7: SynC out

Positive

Input

Inhibit 1

Input

Common

MOR Input Side

10 k

20 k

12V

200 

Figure 4: inhibit 1

Current

Limit

Feedback

Voltage

E/A

Inhibit 2

Sense

Return

MOR Output Side - Single Output

200 

10 k

Figure 5: inhibit 2

Crane Aerospace & Electronics Power Solutions

Mor single and dual dc/dc converters

28 Volt input – 120 Watt

www.interpoint.com

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