FEATURES
• –55°C to +125°C operation
MOR SERIES
120 WATT
DC/DC CONVERTERS
28 VOLT INPUT
• 16 to 40 VDC input
• Fully isolated
• Magnetic feedback
MODELS
VDC OUTPUT
• Fixed frequency 550 kHz typ.
• Topology – Single Ended Forward
• Will withstand transients of
up to 50 V for up to 120 msec.
• Output trim 60% to 110%
• Input and output side inhibit
• Remote sense
SINGLES
DUALS
±3.3
±5
3.3
5
6.3
9.5
12
15
±6.3
±9.5
±12
±15
• Synchronization
• Parallel up to 5 units
• Inhibit function
Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) case U2
Case U2 (flanged, short leads) and case Z (tabbed, leads bent down)
are shown in the picture. Also available: flanged – leads bent down
(case V); tabbed – short leads (case Y) and leads bent up (case W).
See Section B8, cases U2, V, W, Y, and Z for dimensions and options.
• Output short circuit protection
3
• Up to 80 W/in , 87% efficiency
Weight:
110 grams typical
Screening: Standard, ES, or 883 (Class H). See Section C2 for screening options,
see Section A5 for ordering information.
DESCRIPTION
(PWM) current mode control design and switches at 550 kHz,
nominal. The converters also provide short circuit protection by
restricting the current to 125% of the full load output current. All
models offer two inhibits, one referenced to input common and one
referenced to output common. A remote sense function is available
on single output models.
With up to 120 watts of output power, the MOR Series™ of DC/DC
converters operate from a standard 28 volt bus and offer a wide
input range of 16 to 40 VDC. Full operation over the military temper-
ature range, –55°C to +125°C, makes the MOR Series an ideal
choice for military, aerospace, space, and other high reliability appli-
cations. In compliance with MIL-STD-704D, the converters will with-
stand transients of up to 50 volts for up to 120 milliseconds. Use
Interpoint’s FME28-461 EMI filter to pass MIL-STD-461C, CE03
requirements.
Using the trim function, the MOR Series can provide any output from
2 to 33 VDC. For example, trimming the two 15 volt outputs of the
15 dual (MOR2815D) to 14 volts, and then stacking the outputs will
provide a 28 volt output. See Figure 11.
The MOR Series converters incorporate a single-ended forward
topology which uses a constant frequency Pulse Width Modulator
0.5 µΗ
1.7 µΗ
0.1 µΗ
600 µF
1.3 µΗ
3:2
Positive
Output
Positive
Input
100 Ω
600 µF
Positive
Sense
6 µF
6 µF
Sense
Return
0.1 Ω
100 Ω
Input
Common
Output
Common
0.015 µF
500 V
0.015 µF
500 V
Share
Function
Share
Trim
Bias
Supply
FET
Driver
Inhibit 1
V
Secondary V
S+
CC
+
+
UVLO
_
_
V
In
PWM
Controller
V
Ref
Secondary V
CC
Sync In
Sync
In / Out
Inhibit 2
Sync Out
FIGURE 1: SIMPLIFIED SCHEMATIC – MOR2805S, SINGLE 5 VOLT OUTPUT – TYPICAL VALUES
B2-9