SMTR_16 Datasheet, PDF (1/14 Pages) Interpoint Corporation Company – SMTR Single and Dual DC-DC Converters

Crane Aerospace & Electronics Power Solutions
SMTR Single and Dual DC-DC Converters
28 VOLT INPUT – 30 WATT
FEATURES
• Radiation tolerant space dc-dc converter
-- Single event effects (SEE) LET performance to
86 MeV cm²/mg
-- Total ionizing dose (TID) guaranteed per MIL-STD-883
method 1019, radiation hardness assurance (RHA)
P = 30 krad(Si), L = 50 krad(Si), R = 100 krad(Si)
-- 50 - 300 rad(Si)/sec dose rate (Condition A)
-- 10 mrad(Si)/sec dose rate (Condition D)
• Operating temperature -55° to +125°C
• Qualified to MIL-PRF-38534 Class H and K
• Input voltage range 16 to 40 volts
• Transient protection 50 volts for 50 ms
• Fully isolated, magnetic feedback
• Fixed high frequency switching, 600 kHz typical
• Trim function or remote sense on single output models
• Inhibit and synchronization functions
• Indefinite short circuit protection
• Typical efficiency up to 83%
models
Output Voltage (V)
SINGLE DUAL
3.3
±5
5
±12
12
±15
15
DESCRIPTION
The Interpoint^® SMTR Series™ of 28 volt dc-dc converters offers
up to 30 watts of output power from single or dual configurations.
They operate over the full military temperature range of -55°C
to +125°C with up to 84% efficiency. SMTR converters are
packaged in hermetically sealed metal ­enclosures, making them
ideal for use in military, aerospace and other high reliability
applications.
Screening
SMTR converters offer screening options to space prototype (O),
Class H or K and radiation hardness assurance (RHA) levels
P - 30 krad(Si), L - 50 krad(Si) or R - 100 krad(Si). Single event
effects (SEE) LET performance to 86 MeV cm²/mg. See Table 9
on page 13 and Table 10 on page 14 for more information.
Converter Design
The SMTR converters are constant frequency, p­ ulse-width
modu­ lated switching regulators which use a quasi-square wave,
single ended, forward converter design. Tight load regulation is
maintained by using a wide bandwidth magnetic feedback and,
on single output models, through use of remote sense. On dual
output models, the positive output is independently regulated and
the negative output is cross regulated through the use of tightly-
coupled magnetics.
461C’s CE03. For the lowest noise performance, connection
of the case to input common is recommended. The connection
can be hard-wired or ac coupled with a small ceramic bypass
capacitor. Indefinite short circuit protection and overload
protection are ­provided by a constant current-limit feature. This
protective system senses current in the converter’s secondary
stage and limits it to approximately 140% of the maximum rated
output current.
Synchronization
Synchronizing the converter with the system clock allows
the designer to confine switching noise to clock transitions,
minimizing interference and reducing the need for filtering. In
sync mode, the converter will run at any frequency between 500
kHz and 675 kHz. The sync control operates with an active high
at any duty cycle between 40% and 60%. The sync pin should be
connected to input common pin when not in use.
Wide Voltage Range
SMTR converters are designed to provide full power operation
over the input voltage range of 16 to 40 volts. Operation below
16 volts, including MIL-STD-704D emergency power conditions is
possible with derated power. Refer to the low line dropout graph,
Figure 22 on page 10, for details.
SMTR converters have an internal input filter that helps reduce
the need for external components in normal ­operation. Use our
SFMC EMI input filter to meet the requirements of MIL-STD-
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
[phone] • [e-mail]
www.craneae.com/interpoint
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SMTR Rev AC - 2015.10.14