MOR283R3SYSLASH883 datasheet(6/16 Pages) INTERPOINT

6 / 16 page

MOR SERIES

120 WATT

DC/DC CONVERTERS

SYNC IN AND SYNC OUT

The MOR converters

can be synchronized to

the system clock by

applying a TTL compat-

ible sync signal to the

Sync In pin. Sync Out

can be used to synchro-

nize 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% duty cycle,

≤ L ≤ 0.8 V and 4.5 ≤ H ≤ 9 V.

Both Sync In and Sync Out are

referenced to input common. Sync

In should be grounded to input

common if not used.

POSITIVE SENSE,SENSE RETURN

A special remote sensing feature maintains the desired output

voltage at the load. When this feature is not used, connect the

sense lines to their respective output terminals. Remote sensing is

available on single output models only. See Figure 12. Do not

exceed 110% of Vout and maximum output power.

SHARE (PARALLELING)

By using the Share pin, up to five single or dual converters may be

paralleled for a total output power of over 500 watts (90% Pout /

converter, max.). The converters will share within 10% of each

other at 25 to 90% rated power. MOR converters feature true n+1

redundancy for reliability in critical applications. See Figure 9 for

the proper connections.

All Positive Outputs and Positive Senses should be connected to

a common point. All Negative Outputs and Sense Returns should

be connected to a common point. The Share pin is referenced to

Sense Return. Leave the share pin floating (unconnected) if not

used.

POSITIVE OUTPUT,NEGATIVE OUTPUT

AND

OUTPUT COMMON

Output current is 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 7, cross regula-

tion, under the Electrical

Characteristics

Tables.

Dual outputs may be

“stacked” to double the

output voltage.

TYPICAL CONNECTIONS

–

Positive Input

Sync In

Sync Out

Input Common

Positive Output

Positive Sense

Sense Return

Output common

Positive Output

Positive Sense

Sense Return

Output common

Positive Output

Positive Sense

Sense Return

Output common

Load

28V

Positive Input

Sync In

Sync Out

Input Common

Positive Input

Sync In

Sync Out

Input Common

FIGURE 10: PARALLELING

–

Load

Positive Input

28V

Sync In

Inhbit 1

Input Common

Positive Output

Positive Sense

Inhibit 2

Sense Return

Output Common

MOR

Single

Output

–

Load

Positive Input

28V

Sync In

Inhbit 1

Input Common

Positive Output

Inhibit 2

Output Common

Negative Output

MOR

Dual

Output

Load

FIGURE 12: CONNECTIONS

–

Load

Positive Input

Input Common

Positive Output

Inhibit 2

Output Common

Negative Output

MOR

Dual Output

FIGURE 11: “STACKED”OUTPUT

Sync In

Input

Common

330 pF

1.8 k

1 k

10 k

Sync Out

Input

Common

200

Ω

FIGURE 7: SYNC IN

FIGURE 8: SYNC OUT

Sense

Return

10 k

260 k

FIGURE 9: SHARE

MOR283R3SY/883 Datasheet(PDF) 6 Page - Interpoint Corporation Company

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