Crane Aerospace & Electronics Power Solutions
MOR Single and Dual DC/DC Converters
28 VOLT INPUT – 120 WATT
S
YNC
I
N AND
S
YNC
O
UT
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.
V
CC
~
5V
~
Sync In
330 pF
1.8 k
Input
Common
P
OSITIVE
O
UTPUT
,
N
EGATIVE
O
UTPUT
AND
O
UTPUT
C
OMMON
Output current is limited
to 125% of maximum
specified current under
short circuit or load fault
conditions.
1
Positive Input
Positive Output 7
Inhibit 2
+
MOR
Dual Output
2
Input Common
Output Common 8
Load
–
Negative Output 9
V
CC
~
200
Ω
F
IGURE
11: “S
TACKED
” O
UTPUT
Sync Out
Input
Common
F
IGURE
8: S
YNC
I
N
F
IGURE
9: S
YNC
O
UT
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.
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.
1 Positive Input
28V
6 Sync In
5 Sync Out
2
Input Common
Positive Output 7
Positive Sense 10
Share 11
Sense Return 9
Output common 8
P
OSITIVE
S
ENSE
, S
ENSE
R
ETURN
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.
1 Positive Input
6 Sync In
5 Sync Out
2
Input Common
Positive Output 7
Positive Sense 10
Share 11
Sense Return 9
Output common 8
+
Load
–
S
HARE
(P
ARALLELING
)
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.
28V
1 Positive Input
6 Sync In
5 Sync Out
2
Input Common
Positive Output 7
Positive Sense 10
Share 11
Sense Return 9
Output common 8
F
IGURE
12: P
ARALLELING
1
6
4
2
Positive Input
Sync In
Inhbit 1
Positive Output 7
Positive Sense 10
Inhibit 2 12
Sense Return 9
Output Common 8
Load
+
MOR
Single
Output
Share
Sense
Return
F
IGURE
10: S
HARE
Input Common
–
1
6
28V
4
2
Positive Input
Sync In
Inhbit 1
MOR
Dual
Output
Positive Output 7
Inhibit 2 12
Output Common 8
+
Load
0
Load
Input Common
Negative Output 9
–
F
IGURE
13: C
ONNECTIONS
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