Crane Aerospace & Electronics Power Solutions
MOR Single and Dual DC/DC Converters
28 VOLT INPUT – 120 WATT
SYNC IN AND SYNC OUT
POSITIVE OUTPUT,
7
1
2
Positive Output
Inhibit 2
Positive Input
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.
NEGATIVE OUTPUT
AND OUTPUT
+
–
MOR
Dual Output
Output Common
8
9
Load
COMMON
Output current is limited
to 125% of maximum
specified current under
short circuit or load fault
conditions.
Input Common
Negative Output
VCC
VCC
~
~
~
~
FIGURE 11: “STACKED” OUTPUT
5V
~
~
200 Ω
Sync Out
330 pF
Sync In
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.
Input
Common
1.8 k
Input
Common
FIGURE 9: SYNC OUT
FIGURE 8: SYNC IN
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.
7
1
6
5
2
Positive Output
Positive Sense
Positive Input
Sync In
10
28V
11
9
Share
Sync Out
Sense Return
Output common
8
Input Common
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.
7
1
6
Positive Output
Positive Sense
Positive Input
Sync In
10
+
11
9
5
2
Share
Sense Return
Output common
Sync Out
Load
–
8
Input Common
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.
7
1
6
Positive Output
Positive Sense
Positive Input
Sync In
10
11
9
8
Share
5
2
Sync Out
Sense Return
Input Common Output common
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.
FIGURE 12: PARALLELING
7
1
6
Positive Output
Positive Sense
Positive Input
Sync In
+
10
MOR
Single
Output
28V
Load
12
9
4
2
Inhibit 2
Inhbit 1
Sense Return
8
Input Common
–
+
Output Common
Share
7
1
6
Positive Output
Inhibit 2
Positive Input
12
Load
Load
MOR
Dual
Sync In
Inhbit 1
Sense
Return
28V
8
Output Common
0
4
2
Output
FIGURE 10: SHARE
Input Common
9
–
Negative Output
FIGURE 13: CONNECTIONS
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