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SMRT28515TKR Datasheet(PDF) 2 Page - Crane Aerospace & Electronics. |
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SMRT28515TKR Datasheet(HTML) 2 Page - Crane Aerospace & Electronics. |
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2 / 17 page  INHIBIT FUNCTION The SMRT Series incorporates an inhibit terminal that can be used to disable internal switching. The converter is inhibited when a low (≤ 0.4 V) signal is applied to the inhibit pin. In the inhibit mode the inhibit pin current requirement is less than ~2 mA. The converter resumes normal operation when a high (≥ 2.4 V) signal or open circuit is applied to the inhibit pin. The open circuit voltage of the inhibit is 5 to 6 volts.The maximum allowable voltage applied to the inhibit pin is 10 VDC. SYNCHRONIZATION An isolated sync input allows this input to be connected to any of the devices three returns. It can be referenced to the input return or any of the output returns. Input current into this pin is limited by a series 1k ohm resistance. OUTPUT VOLTAGE TRIM The output voltage of each set can be trimmed up by up to 25%, or down by up to 45% of nominal (varies by model, see trim instructions). The following are “sets” of voltages in relation to trim: • Triple output models: Main output is one set, the dual outputs are another set. • Dual outputs: Each output is a “set.” One set can be trimmed using the trim pin, the other set can be trimmed (up only) using the sense pin. • Single: One set RADIATION HARDENED The SMRT DC/DC converters are designed to provide continuous normal operation through radiation levels associated with space missions and in tactical and strategic military environments. The converters will operate normally in radiation environments with up to 1 x 1012 neutrons per square centimeter neutron fluence, 1011 rads(Si) per second dose rate, and 3x105 rads(Si) total dose. These levels of radiation tolerance make the SMRT converters suitable for electronics in programs where operation in high radiation environments is required. At the highest dose rate (1011 rads(Si)/sec dose rate) there will be an upset resulting in a dip in the voltage. This is non- destructive to the unit. The converter will operate through the upset. SCREENING SMRT converters offer the following screening options: Space Prototype (O), 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. EMI The SMRT has a built-in EMI input filter which brings the conducted emissions into compliance with both methods of MIL-STD-461, revisions C-CE03 and D-/E-CE102. SENSE Tight load regulation is maintained via wide bandwidth magnetic feedback and through the use of remote sense on single output models and one output (Output “A”) of the dual units. The sense feature can be used to adjust the output voltage by connecting a resistor between the sense line and the positive output. SENSE ADJUST INSTRUCTIONS (UP ONLY) - DUAL UNITS OUTPUT A ONLY (See trim tables on page 4) 5V Dual Sense Adjust: Max. 5.40 V R EXTERNAL = 30 ( Vdesired - 5 ) 0.675 - 0.125 Vdesired 12V Dual Sense Adjust: Max. 12.48 V R EXTERNAL = 600 ( 5 x Vdesired - 60.42 ) 156 - 12.5Vdesired 15V Dual Sense Adjust: Max 15.36 V R EXTERNAL = 600 ( Vdesired - 15 ) 38.4 - 2.5Vdesired Crane Aerospace & Electronics Power Solutions www.craneae.com Page 2 of 17 Rev B – 20080213 SMRT Single, Dual and Triple DC/DC Converters 28 VOLT INPUT – 35 WATT |
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