Crane Aerospace & Electronics Power Solutions
sMrt28 single, Dual and triple space Dc/Dc converters
28 VOLt Input – 35 Watt – space quaLIFIeD
Operating COnditiOns and CharaCteristiCs
Input Voltage range
• 19 to 56 VDC continuous
• 80 V for 100 ms transient
conversion Frequency
• 300 kHz typ 270 kHz min, 330 kHz max
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
radiation (will operate through)
• 1x10
12
neutrons/cm
2
neutron or proton fluence
• Radiation dose rate 10
11
rad(Si) /sec
• Total dose up to 300 kRad(Si)
• SEE - LET to 80 MeV cm
2
/mg
synC and inhibit
sync
• Input frequency 270-330 kHz
• Duty cycle 20% min, 80% max
• 2.5 V p-p minimum amplitude
• 10 V p-p maximum amplitude
• Sync circuit is floating and isolated
• If sync is used at lower end of the range, full load
operation is not guaranteed.
Inhibit
• Active low (output disabled)
‣
InH referenced to input common
‣
Active low, pulled to 0.4 V or lower
‣
Inhibit pin current < 2mA
• Active high (output enabled)
‣
High >2.4V
‣
not to exceed 10V
‣
Open pin voltage 5 to 6 volts
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
power Dissipation (pd)
• 20 to 31 W
current Limit
• 125% of full load typical
Output Voltage temperature coefficient
• 100 ppm/°C max
Isolation at 25°c
• 100 megohm minimum at 500 V
audio rejection
• 50 dB typical
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 are 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 Screening Tables 1, 2 and 3 for more information. Available
configurations: OO, HP, HR, KP, KR, KF
www.interpoint.com
Page 3 of 19
SMRT28 Rev E - 20100216
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
