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參數(shù)資料
| 型號： | SMRT283R3S/KF |
| 廠商： | CRANE ELECTRONICS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 23 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | HERMETIC SEALED PACKAGE-14/12 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大小： | 1012K |
| 代理商： | SMRT283R3S/KF |
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 converter as the SMRT28 Inhibit pin can sink current.
Whenpullingmultipleinhibitsignalslowaseparateinterface
is recommended 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
resumesnormaloperationwhenahigh(≥2.4V)signaloropen
circuit is 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
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 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
radiation 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.craneae.com/interpoint
Page 2 of 22
sMrt28 single, Dual and triple space Dc/Dc converters
28 VOLt Input – 35 Watt – space quaLIFIeD
SMRT28 Rev F - 2011.01.24
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