inhibit Function
SMTR 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
inhibitpinispulledto≤0.8V.Theunitisenabledwhen
the pin, which is internally connected to a pull-up resistor, is left
unconnected or is connected to an open-collector gate. The open
circuit output voltage associated with the inhibit pin is 9 to 11
VDC. In the inhibit mode, a maximum of 8 mA must be sunk from
the inhibit pin.
OPERaTINg CONDITIONS aND ChaRaCTERISTICS
Input Voltage Range
16 to 40 VDC continuous
50 V for 50 msec transient
Output Power
Up 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, 300 ppm/°C aux triple output
Input to Output Capacitance
50 pF typ (100 pF typ triple outputs)
Current limit
125% of full load typical
Isolation
100 megohm minimum at 500 VDC
Any pin to case, except case pin
audio Rejection
40 dB typ (50 dB typ, triple output)
Conversion Frequency
Free run 550 min, 600 typ, 650 max kHz
External sync 500 to 675 kHz
MEChaNICal aND ENVIRONMENTal
Size (maximum)
Single and dual output
non-flanged: 2.100 x 1.115 x 0.400 inches
(53.34 x 28.32 x 10.16 mm) See case H2 for dimensions.
Flanged: 2.910 x 1.115 x 0.400 inches
(73.91 x 28.32 x 10.16 mm) See case K3 for dimensions.
Triple output
non-flanged: 1.950 x 1.350 x 0.405 inches
(49.53 x 34.29 x 10.29 mm) See case F1 for dimensions.
Flanged: 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
Space Prototype (O), Class H, or Class K are radiation tolerant
to Radiation Hardness Assurance (RHA) levels of “-” (O), “P”
or “R”, per MIL-STD-38534. Interpoint model numbers use an
“O” in the RHA designator position to indicate the “-” (dash)
Radiation hardness Assurance level of MIL-PRF- 38534, which
is defined as “no RHA”.
See Screening Tables 1 and 2 for more information. Available
configurations are: OO, HP, KP, HR, and KR
Sync and inhibit (inh1, inh2)
Sync
Sync In
Input frequency 500 to 675 Hz.
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
Sync Out
Referenced 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.
Inhibit pin source current, 8 mA max
Referenced to input common
Converter Enabled (active high)
Inhibit pin open or through an open collector
If not used, leave unconnected
Open pin voltage 9 to 11 V
Crane Aerospace & Electronics Power Solutions
www.craneae.com/interpoint
Page 2 of 20
SMTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT
SMTR Rev g - 2011.05.04