Crane Aerospace & Electronics Power Solutions
MOR Single and Dual DC/DC Converters
28 VOLT INPUT – 120 WATT
SYNC AND INHIBIT
OPERATING CONDITIONS AND CHARACTERISTICS
Input Voltage Range
Sync In (525 to 625 kHz)
• Logic low 0.8 V max, duty cycle 15% to 50%
• Logic high 4.5 V min, 9 V max
• Referenced to input common
Sync Out - Referenced to input common
• 16 to 40 VDC continuous
• 50 V for 120 msec transient
Output Power
• 66 to 120 W, depending on model
Power Dissipation (Pd)
Inhibit (INH1, INH2) : TTL Open Collector
• Logic low (output disabled), V = 0.2 V max.
• INH1 referenced to input common
• 30 W
Lead Soldering Temperature (10 sec per lead)
• 300°C
• INH2 referenced to output common
Storage Temperature Range (Case)
• –65°C to +150°C
• Logic high (output enabled) open collector
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135° C
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
MECHANICAL AND ENVIRONMENTAL
Input to Output Capacitance
• 150 pF typical
Size (maximum)
Current Limit
3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
• 125% of full load typical
Isolation
Available in a variety of packages. See cases U, V, W, Y, and Z
for dimensions.
• 100 megohm minimum at 500 V
Audio Rejection
Weight (maximum)
• 40 dB typical
110 grams typical
Conversion Frequency
• Free run mode, 25°C, 550 kHz typical
480 kHz. min, 580 kHz max
• External sync range 525 to 625 kHz
Inhibit Pin Voltage (unit enabled)
• INH1 = 13 V typ, INH2 = 8 V typical
Undervoltage Lockout
Screening
Standard, ES, or 883 (Class H, QML). See “883, Class H, QML Products –
Environmental Screeing” for more information.
• 15.5 V input typical
0.5 μΗ
1.7 μΗ
0.1 μΗ
600 μF
1.3 μΗ
Positive
Output
Positive
Input
100 Ω
600 μF
Positive
6 μF
Sense
6 μF
Sense
Return
0.1 Ω
100 Ω
Input
Output
Common
Common
0.015 μF
500 V
0.015 μF
500 V
Share
Share
Trim
Function
Bias
Supply
FET
Inhibit 1
V
Secondary V
S+
CC
Driver
+
_
+
_
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
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Rev G - 20060418
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