MOR283R3SSLASH883 datasheet(5/21 Pages) CRANE

5 / 21 page

SYNC IN AND SYNC OUT

The MOR converters can be synchronized to the system clock by

applying a TTL compatible 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% duty

cycle, 0 ≤ 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. See Figures 8 and 9.

POSITIVE SENSE, SENSE RETURN

A special remote sensing feature maintains the desired output

voltage at the load. See Figure 12. When this feature is not used,

connect the sense lines to their respective output terminals. See

Figure 13. Remote sensing is available on single output models

only. o 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 10 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. Also see Figure 12.

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 regulation, under the Electrical Characteristics Tables. Dual

outputs may be “stacked” to double the output voltage. See Figure

11.

Sense

Return

MOR Single and Dual DC/DC Converters

Crane Aerospace & Electronics Power Solutions

Page 5 of 21

Rev G - 20060418

www.craneae.com

28 VOLT INPUT – 120 WATT

–

Load

Positive Input

Input Common

Positive Output

Inhibit 2

Output Common

Negative Output

MOR

Dual Output

FIGURE 11: “STACKED” OUTPUT

FIGURE 10: SHARE

Sync In

Input

Common

330 pF

1.8 k

FIGURE 8: SYNC IN

Sync Out

Input

Common

200

FIGURE 9: SYNC OUT

–

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 12: 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 13: CONNECTIONS

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