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
7
1
Positive Output
Positive Sense
Positive Input
10
VCC
~
6
5
2
Sync In
28V
~
11
9
8
Share
Sync Out
10 k
10 k
1 k
5V
Sense Return
Output common
~
~
Input Common
330 pF
Sync In
Sync In pin. Sync Out
can be used to synchro-
nize other components
to the MOR converter’s
switching frequency.
1.8 k
7
1
6
Positive Output
Positive Sense
Positive Input
Sync In
Input
Common
10
+
FIGURE 7: SYNC IN
11
9
8
5
2
Share
Sense Return
Output common
Sync Out
Load
–
Input Common
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.
VCC
~
~
7
1
6
Positive Output
Positive Sense
Positive Input
Sync In
10
200 Ω
Sync Out
11
9
8
Share
5
2
Sync Out
Input
Common
Sense Return
Input Common Output common
FIGURE 8: SYNC OUT
FIGURE 10: PARALLELING
POSITIVE OUTPUT, NEGATIVE OUTPUT
AND OUTPUT COMMON
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.
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
SHARE (PARALLELING)
from the positive output
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.
7
1
Positive Output
Inhibit 2
Positive Input
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.
+
MOR
Dual Output
Output Common
8
9
Load
–
2
Input Common
Negative Output
FIGURE 11: “STACKED” OUTPUT
Share
10 k
260 k
Sense
Return
TYPICAL CONNECTIONS
7
FIGURE 9: SHARE
1
Positive Output
Positive Sense
Positive Input
+
10
MOR
Single
Output
6
Sync In
28V
Load
12
9
4
Inhibit 2
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.
Inhbit 1
Sense Return
8
2
Input Common
–
Output Common
7
1
6
Positive Output
Inhibit 2
Positive Input
Sync In
+
12
Load
Load
MOR
Dual
28V
8
Output Common
0
4
2
Inhbit 1
Output
Input Common
9
–
Negative Output
FIGURE 12: CONNECTIONS
6
CRANE [ Crane Aerospace & Electronics. ]
