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SMRT2812D датащи(PDF) 2 Page - Interpoint Corporation Company |
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SMRT2812D датащи(HTML) 2 Page - Interpoint Corporation Company |
2 / 19 page unDerVOltage lOCkOut The converters have an undervoltage lockout that will allow power conversion at approximately 17 volts on a rising input voltage and a conversion shut-down on a falling voltage at approximately 14.5 volts. InhIbIt FunCtIOn The SMRT28 Series incorporates an inhibit terminal that can be used to disable internal switching. It is not recommended to tie the Inhibit pin of an SMRT28 directly to the Inhibit pin of another converterastheSMRT28Inhibitpincansinkcurrent.When pulling multiple inhibit signals low a separate interface is recom- mended for each SMRT28. The converter is inhibited when the inhibit pin is pulled low (0.4 V). In the inhibit mode the inhibit pin current requirement is less than ~2 mA. The converter resumes normaloperationwhenahigh(≥2.4V)signaloropencircuitis applied to the inhibit pin. The open circuit voltage of the inhibit is 5 to 6 volts. Although open circuit is the preferred method for the enabled state, up to 10 volts may be applied to the inhibit pin. SynChrOnIzatIOn The Sync Input is isolated which allows Sync Return to be tied to the primary side, secondary side, or float with respect to all inputs and outputs. Input current into this pin is limited by a series 1 k ohm resistance. Output VOltage trIm The output voltage of each set can be trimmed from 51% to 125% of nominal (varies by model, see trim instructions on page 4). The following are “sets” of voltages in relation to trim: •Tripleoutputmodels:Mainoutputisoneset,thedualoutputs are another set. •Dualoutputs:Eachoutputisa“set.” One set can be trimmed using the trim pin, the other set can be trimmed (up only) using the positive sense pin. •Single:Oneset raDIatIOn tOleranCe The SMRT28 DC/DC converters are designed to provide contin- uous normal operation through radiation levels associated with space missions and in tactical and strategic military environ- ments. The converters will operate normally in radiation environ- ments with up to 1 x 1012 neutrons per square centimeter neutron fluence, 1011 rad(Si) per second dose rate, and 3x105 rad(Si) total dose. These levels of radiation tolerance make the SMRT28 converters suitable for electronics in programs where operation in high radia- tion environments is required. At the highest dose rate (1011 rad(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 SMRT28 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 Screening Tables 1, 2 and 3 for more information. emI The SMRT28 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-/F-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 positive sense line and the positive output. SenSe AdjuSt InStructIonS for output A on duAl ModelS AdjuSt up only (see trim tables on page 4 for more options) RaDjuSt = 240 ( Vout-Vnom) Vmax - Vout Vout = desired output voltage Vnom = nominal unadjusted output voltage Vmax = maximum achievable output voltage 5V Vmax = 6.0 V 12V Vmax = 14.68 V 15V Vmax = 18.36V note: RADJUST should be connected between Sense A (pin 8) and Vout A (pin 11). Crane Aerospace & Electronics Power Solutions www.interpoint.com Page 2 of 19 sMrt28 single, Dual and triple space Dc/Dc converters 28 VOLt Input – 35 Watt – space quaLIFIeD SMRT28 Rev E - 20100216 |
Аналогичный номер детали - SMRT2812D |
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Аналогичное описание - SMRT2812D |
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