inhibit FunCtion
MTR converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output and very low
quiescent input current. The converter is inhibited when the inhibit
pin is pulled below (<0.8 V). The unit is enabled when the inhibit
pin, which is internally connected to a pull-up resistor, is left
unconnected or is connected to an open-collector gate. The open
circuit voltage associated with the inhibit pin is 9 to 11 V. In the
inhibit mode, a maximum of 8 mA must be sunk from the inhibit
pin.
Operating COnditiOns and CharaCteristiCs
Input Voltage
16 to 40 VDC continuous
50 V for 50 msec transient
Output Power
20 to 30 watts depending on model
lead Soldering Temperature (10 sec per pin)
300°C
Storage Temperature Range (Case)
-65°C to +150°C
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 single and dual outputs
200 ppm/°C main typical, 300 ppm/°C aux
triple output typical
Input to Output Capacitance
50 pF typ (100 pF typical triple outputs)
Current limit
115% of full load typical
Isolation
100 megohm minimum at 500 V
audio Rejection
40 dB typ (50 dB typical triple output)
Conversion Frequency
Free run
550 min, 600 typical, 650 max kHz duals and singles
525 min, 600 typical, 650 max kHz triples
External sync
500 to 675 kHz singles and duals
500 to 700 kHz triples
synC and inhibit
Sync (500 to 675 kHz)
Duty cycle 40% min, 60% max
Active low 0.8 V max
Active high 4.5 V min, 5 V max
Referenced to input common
If not used, connect to input common
Inhibit (do not apply a voltage to the inhibit pin)
Converter Disabled (active low)
Pull voltage to 0.8 V or below by connecting to ground or
other method. Do not apply voltage.
Inhibit pin source current
8.0 mA max for singles and duals
-
6.0 mA max for triples
-
Converter Enabled (active high)
Inhibit pin open or through an open collector
Inhibit open pin voltage is 9 to 11 V
meChaniCal and envirOnmental
Size (maximum)
Non-flanged
Single (all models) and dual output (for dual 883 only)
2.100 x 1.115 x 0.400 inches (53.34 x 28.32 x 10.16 mm)
-
See case H2 for dimensions.
MTR dual with standard or ES screening, 2.115 x 1.125
-
x 0.417 inches (53.72 x 28.58 x 10.59 mm) See Case H4
for dimensions.
Triple output
1.950 x 1.350 x 0.405 inches (49.53 x 34.29 x 10.29 mm)
-
See case F1 for dimensions.
Flanged
Single (all models) and dual output (for dual 883 only)
2.910 x 1.115 x 0.400 inches (73.91 x 28.32 x 10.16 mm)
-
See case K3 for dimensions.
MTR dual with standard or ES screening, 2.910 x 1.120
-
x 0.417 inches (73.91 x 28.45 x 10.59 mm) See case K5
for dimensions.
Triple output
2.720 x 1.350 x 0.405 inches (69.09 x 34.29 x 10.29 mm)
-
See case J1 for dimensions.
Weight (maximum)
Single and dual non-flanged 50 grams, flanged 52 grams
Triple non-flanged 58 grams, flanged 62 grams
Screening
Standard, ES, or 883 (Class H, QML) available. See
Screening Tables 1 and 2 for more information.
Crane Aerospace & Electronics Power Solutions
MTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT
www.craneae.com/interpoint
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MTR Rev H - 2011.03.17