Crane Aerospace & Electronics Power Solutions
ꢂTR (40) Single, Dꢀꢁl ꢁnd Triple DC-DC Converters
28 (16-40) VOꢃT INPuT – 30 WaTT
FEaTuRES
No cross-regꢀlꢁtion error in triple oꢀtpꢀt models
Operꢁting temperꢁtꢀre -55° to +125°C
• Input voltage range 16 to 40 VDC
• Transient protection 50 Vin for 50 ms
• Fully isolated, magnetic feedback
• Fixed high frequency switching
• Inhibit and synchronization function
• Indefinite short circuit and overload protection
ꢂODEꢃS
VDC Output
also see our iMproveD Mtr (50)
16 - 50 Vin, 80 V transient / 50 ms.
Datasheet at www.interpoint.com/mtr50
SINGLE
DUAL
±5
TRIPLE
+5 & ±12
+5 & ±15
3.3
5
±12
±15
12
15
18
DESCRIPTION
The Interpoint™ MTR Series™ of dc-dc converters offers up
to 30 watts of output power from single, dual, or triple output
configurations. MTR (40) models have an input voltage range
of 16 to 40 and transient protection up to 50 Vin for up to 50
milliseconds. They operate over the full military temperature
range with up to 84% efficiency. MTR converters are packaged
in hermetically sealed metal cases, making them ideal for use
in military, aerospace and other high reliability applications. The
converters are offered with standard screening, “ES” screening,
or fully compliant to “883” MIL-PRF-38534 Class H screening.
See “Table 12: Element Evaluation” on page 25 and “Table 13:
Environmental Screening” on page 26 for more information.
Standard microcircuit drawings (SMD) are available. See
“Table 3: SMD Number Cross Reference” on page 8.
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 125% of the maximum rated output
current.
MTR converters are provided with internal filtering capacitors
that help reduce the need for external components in normal
operation. Use our FMCE-0328™, FMCE-0528™ or FMCE-
0828™ EMI filter to meet the requirements of MIL-STD-461C
CE03 and CS01 and/or MIL-STD-461D, E and F CE102 and
CS101 levels of conducted emissions. Or use the FM-704A for
transient suppression and to meet MIL-STD-461C CE03.
Cover Marking
Converter Design
The cover marking for the MTR 40 is “MTR DC-DC
CONVERTER” under the model number. See “Figure 11: Cover
Marking for MTR - 40 Vin” on page 8.
The MTR converters are constant frequency, pulse-width
modulated switching regulators which use a quasi-square wave,
single ended, forward converter design. Tight load regulation is
maintained via 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. The MTR Series triple output dc-dc
converter’s design includes individual regulators on the auxiliary
outputs which provide for no cross regulation error when a
minimum 300 mA load is maintained on the main (+5) output.
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 for singles and duals and between 500 and 700
for triples. The sync control operates with a duty cycle between
40% and 60%. The sync pin must be connected to input common
pin when not in use.
Crane Aerospace & Electronics
Page 1 of 26
MTR-01 Rev AA - 2013.09.04
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
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