Crane Aerospace & Electronics Power Solutions
mTR (40) Single, Dual and Triple DC-DC Converters
28 (16-40) VOlT INPuT – 30 WaTT
FEaTuRES
No cross-regulation error in triple output models
Operating temperature -55° to +125°C
•
Transient protection 50 Vin for 50 ms
•
Fully isolated, magnetic feedback
• Fixed high frequency switching
•
Input voltage range 16 to 40 VDC
•
Inhibit and synchronization function
•
Indefinite short circuit and overload protection
mODElS
DUAL
±5
±12
±15
a
lso see our
i
MproveD
Mtr (50)
16 - 50 Vin, 80 V transient / 50 ms.
Datasheet at www.interpoint.com/mtr50
VDC O
utput
SINGLE
3.3
5
12
15
18
TRIPLE
+5 & ±12
+5 & ±15
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.
C
onverter
D
esign
C
over
M
arking
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.
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.
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.
s
ynChronization
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
Page 1 of 26
MTR-01 Rev AA - 2013.09.04
Crane Aerospace & Electronics Power Solutions
mTR (40) Single, Dual and Triple DC-DC Converters
28 (16-40) VOlT INPuT – 30 WaTT
W
iDe
i
nput
v
oltage
r
ange
MTR converters are designed to provide full power over a
full 16 to 40 VDC input voltage range. Operation below 16
volts, including MIL-STD-704A emergency power conditions is
possible with derated power. Refer to the low line dropout graphs
(“Figure 27”, “Figure 35” and “Figure 36”) for details.
i
nhibit
F
unCtion
D
ynaMiC
r
esponse
The MTR Series feed-forward compensation system provides
excellent dynamic response and noise rejection. Audio rejection
is typically 40 dB for singles and duals and 50 dB for triples. The
minimum to maximum step line transition response is typically
less than 4%.
MTR converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output voltage and very
low quiescent input current. The converter is inhibited when the
inhibit pin is pulled below 0.8 V and enabled when its inhibit pin
is left floating. An external inhibit interface should be capable of
pulling the converter’s inhibit pin below 0.8 V while sinking the
maximum inhibit current and also allowing the inhibit pin to float
high to enable the converter. A voltage should not be applied to
the inhibit pin. The open circuit voltage present on the inhibit pin
is 9 to 11 V.
MTR Single Output
Input Filter
Positive
Input
Input
Common
Positive
Output
Inhibit
V
BIAS
Sync In
PWM
Driver
Current Limit
Voltage
Feedback
Output
Common
Input
Common
Input
Common
Case
F
igure
1: Mtr s
ingle
b
loCk
D
iagraM
www.craneae.com/interpoint
Page 2 of 26
MTR-01 Rev AA - 2013.09.04
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