Crane Aerospace & Electronics Power Solutions
SMRT Single, Dual and Triple DC/DC Converters
28 VOLT INPUT – 35 WATT
Input Voltage Range
• 19 to 56 VDC continuous
Output Power
• up to 35 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
Power Dissipation (Pd)
• 20 to 28 W
Output Voltage Temperature Coefficient
• 100 ppm/°C max
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 50 dB typical
Conversion Frequency
• 300 kHz typical, 270 kHz min., 330 kHz max.
Radiation (will operate through)
• 1x10
12
neutrons/cm
2
neutron or proton fluence
• Radiation dose rate 10
11
rads (Si) /sec
• Total dose up to 300 K rads (Si)
• SEU 60 MeV-cm
2
/mg
Cross Regulation
• 2.5% typical
• Applies to -V
O
AUX on triple models only
• Variation of -V
O
AUX from +P
O
=80%, -P
O
=20%
to +P
O
=20%, -P
O
=80%
• Referenced to 50%/50% balanced ±V
O
AUX loads
OPERATING CONDITIONS AND CHARACTERISTICS
SYNC AND INHIBIT
Sync In 270-330 kHz typical
• Duty cycle 20% min, 80% max
• 2.5V p-p minimum amplitude
• 10V p-p maximum amplitude
• Can be referenced to input or output return
• If sync is used at lower end of the range, full load
operation is not guaranteed.
Inhibit
• Actve low (output disabled)
INH referenced to input common
Active low 0.4 V max
Inhibit pin current < 2mA
• Open collector (output enabled)
High >3.0V
Not to exceed 10V
Open Collector
Inhibit Pin Voltage
• 5 to 6 V
MECHANICAL AND ENVIRONMENTAL
Size (maximum)
2.705 x 2.205 x 0.400 inches (68.71 x 56.01 x 10.16 mm)
See case S for dimensions.
Weight (maximum)
100 grams maximum
Screening
Space Prototype, Class H, or Class K
Radiation tolerant to Radiation Hardness Assurance (RHA) levels of “-” (O), “P”, “R”, or “F” per MIL-PRF-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 “Class H and K, MIL-PRF-38534 Screening” tables for more information.
Available configurations: OO, HP, HR, KP, KR, KF
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