The Interpoint™ MTR Series™ of DC/DC converters offers up
to 30 watts of output power from single, dual, or triple output
configurations. 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.
Standard microcircuit drawings (SMD) are available.
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.
s
ynChronization
C
onverter
D
esign
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.
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 115% of the maximum rated output
current.
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 a duty cycle
between 40% and 60%. The sync pin must be connected to input
common pin when not in use.
W
iDe
i
nput
v
oltage
r
ange
MTR converters are designed to provide full power over a full
16 to 40 VDC voltage range. Operation below 16 volts, including
MIL-STD-704A emergency power conditions is possible with
derated power. Refer to the low line dropout graph (Figures 22,
30 and 31) for details.
i
mproveD
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%.
Crane Aerospace & Electronics
Crane Electronics, Inc.
Power Solutions – Interpoint Products
PO Box 97005 • Redmond, WA 98073-9705
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
Page 1 of 22
MTR Rev J - 2011.09.08
Crane Aerospace & Electronics Power Solutions
MTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT
i
nhibit
F
unCtion
MTR converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output and very low
quiescent input current. The converter is inhibited when the inhibit
pin is pulled below (<0.8 V). The unit is enabled when the inhibit
pin, which is internally connected to a pull-up resistor, is left
unconnected or is connected to an open-collector gate. The open
circuit voltage associated with the inhibit pin is 9 to 11 V. In the
inhibit mode, a maximum of 8 mA must be sunk from the inhibit
pin.
audio Rejection
•
40 dB typ (50 dB typical triple output)
Operating COnditiOns and CharaCteristiCs
Input Voltage
•
16 to 40 VDC continuous
•
50 V for 50 msec transient
Output Power
•
20 to 30 watts depending on model
lead Soldering Temperature (10 sec per pin)
•
300°C
Storage Temperature Range (Case)
•
-65°C to +150°C
Case Operating Temperature (Tc)
•
-55°C to +125°C full power
•
-55°C to +135°C absolute
Conversion Frequency
•
Free run
‣
550 min, 600 typical, 650 max kHz duals and singles
‣
525 min, 600 typical, 650 max kHz triples
•
External sync
‣
500 to 675 kHz singles and duals
‣
500 to 700 kHz triples
synC and inhibit
Sync (500 to 675 kHz)
•
Duty cycle 40% min, 60% max
•
Active low 0.8 V max
•
Active high 4.5 V min, 5 V max
•
Referenced to input common
•
If not used, connect to input common
Derating Output Power/Current
•
Linearly from 100% at 125°C to 0% at 135°C
Output Voltage Temperature Coefficient
•
100 ppm/°C typical single and dual outputs
•
200 ppm/°C main typical, 300 ppm/°C aux
triple output typical
Input to Output Capacitance
•
50 pF typ (100 pF typical triple outputs)
Current limit
•
115% of full load typical
Isolation
•
100 megohm minimum at 500 V
Inhibit (do not apply a voltage to the inhibit pin)
•
Converter Disabled (active low)
‣
Pull voltage to 0.8 V or below by connecting to ground or
other method. Do not apply voltage.
‣
Inhibit pin source current
- 8.0 mA max for singles and duals
- 6.0 mA max for triples
•
Converter Enabled (active high)
‣
Inhibit pin open or through an open collector
‣
Inhibit open pin voltage is 9 to 11 V
meChaniCal and envirOnmental
Size (maximum)
•
Non-flanged
‣
Single (all models) and dual output (for dual 883 only)
- 2.100 x 1.115 x 0.400 inches (53.34 x 28.32 x 10.16 mm)
See case H2 for dimensions.
- MTR dual with standard or ES screening, 2.115 x 1.125
x 0.417 inches (53.72 x 28.58 x 10.59 mm) See Case H4
for dimensions.
‣
Triple output
- 1.950 x 1.350 x 0.405 inches (49.53 x 34.29 x 10.29 mm)
See case F1 for dimensions.
Weight (maximum)
•
Single and dual non-flanged 50 grams, flanged 52 grams
•
Triple non-flanged 58 grams, flanged 62 grams
www.craneae.com/interpoint
•
Flanged
‣
Single (all models) and dual output (for dual 883 only)
- 2.910 x 1.115 x 0.400 inches (73.91 x 28.32 x 10.16 mm)
See case K3 for dimensions.
- MTR dual with standard or ES screening, 2.910 x 1.120
x 0.417 inches (73.91 x 28.45 x 10.59 mm) See case K5
for dimensions.
‣
Triple output
- 2.720 x 1.350 x 0.405 inches (69.09 x 34.29 x 10.29 mm)
See case J1 for dimensions.
Screening
•
Standard, ES, or 883 (Class H, QML) available. See
Screening Tables 1 and 2 for more information.
Page 2 of 22
MTR Rev J - 2011.09.08
Crane Aerospace & Electronics Power Solutions
MTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT
TRIM aND REMOTE SENSE (aVaIlablE ON SINglE 5, 12 aND 15 OuTPuT MODElS ONly)
MTR SINGLE OUTPUT CONVERTER
1
+VIN
OUTPUT
COMMON
SENSE
RETURN
SENSE
10
INPUT
COMMON
POSITIVE
OUTPUT
4
1
3
6
1
RT
5
RL
EXTERNAL TRIM CONNECTION
1 Make connections at converter.
Trim Formulas
Vout = desired output voltage; Rt = trim resistor
3.3V: Rt = 1300 * Vout – 4304
1.2475
5V: Rt = 1300 * Vout – 6512
1.2475
12V: Rt = 1300 * Vout – 15631
1.2475
15V: Rt = 1300 * Vout – 19498
1.2475
F
igure
1: t
rim
C
onneCtion 1, 2, 3
MTR SINGLE OUTPUT CONVERTER
1
+VIN
OUTPUT
COMMON
SENSE
RETURN
SENSE
10
INPUT
COMMON
POSITIVE
OUTPUT
4
2
3
6
2
RL
5
REMOTE SENSE CONNECTION
2 Make connections at load.
F
igure
2: r
emote
s
ense
C
onneCtion
Notes for Remote Sense and Trim
1. When trimming output voltage and/or remote sensing, the total output voltage increase must be
less than 0.6 volts at the converters pins. Do not exceed the maximum power.
2. If neither voltage trim nor remote sense will be used, connect pin 3 to pin 4 and pin 5 to pin 6.
3. CAUTION: The converter will be permanently damaged if the remote sense (pin 6) is shorted to
ground. Damage may also result if the output common or positive output is disconnected from the
load with the remote sense leads connected to the load.
4. When using remote sense for voltage compensation or when using remote sense for trim, the
output will drift over temperature. Contact Applications Engineering for more information at power-
apps@crane-eg.com
www.craneae.com/interpoint
Page 3 of 22
MTR Rev J - 2011.09.08
Crane Aerospace & Electronics Power Solutions
MTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT
PINS NOT IN uSE
PIN OuT
1
2
3
4
5
6
7
8
9
10
Pin
Positive Input
Inhibit
Single Output
Positive Input
Inhibit
Positive Output
Dual Output
Positive Input
Triple Output
Inhibit
Sync In
Leave unconnected
Sense Return
Main (+5) Output
Output Common
Neg. Aux. Output
Pos. Aux. Output
Case Ground
Case Ground
Inhibit
Sync
Sense Lines
Connect to input common
Must be connected to
appropriate outputs
Output Common
Positive Output
Positive Sense
Case Ground
Case Ground
Sync
Input Common
Output Common
Negative Output
Case Ground
Case Ground
Case Ground
Sync
Input Common
Input Common
Dot on top of cover indicates pin one.
1
2
3
4
5
BOTTOM VIEW
MTR SINGLE
FLANGED AND NON-FLANGED
10
9
8
7
6
Dotted line outlines flanged package option.
F
igure
3: p
in
o
ut
s
ingle
o
utput
m
oDels
See cases H2 and K3 for dimensions.
Dot on top of cover indicates pin one.
Squared corner and dot on top
of package indicate pin one.
1
2
3
4
5
1
2
3
4
5
BOTTOM ViEW
MTR DUAL
FLANGED AND NON-FLANGED
10
9
8
7
6
BOTTOM VIEW
MTR TRIPLE
FLANGED AND NON-FLANGED
10
9
8
7
6
Dotted line outlines flanged package option.
See cases H2, H4, K3 and K5 for dimensions.
F
igure
4: p
in
o
ut
D
ual
o
utput
m
oDels
Dotted line outlines flanged package option.
See cases F1 and J1 for dimensions.
F
igure
5: p
in
o
ut
t
riple
o
utput
m
oDels
www.craneae.com/interpoint
Page 4 of 22
MTR Rev J - 2011.09.08
Crane Aerospace & Electronics Power Solutions
MTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT
MODEl NuMbERINg kEy
Base Model
Input Voltage
MTR
28 512 T
F / 883
SMD NuMbERS
STANDARD
MICROCIRCUIT
DRAWing (SMD)
5962-0150101HXC
5962-9306801HXC
5962-9306901HXC
5962-9307001HXC
5962-9320201HXC
5962-9320501HXC
5962-9307101HXC
5962-9307201HXC
5962-9307301HXC
5962-9307401HXC
MTR SERIES
SIMILAR PART
MTR283R3S/883
MTR2805S/883
MTR2812S/883
MTR2815S/883
MTR2818S/883
MTR2805D/883
MTR2812D/883
MTR2815D/883
MTR28512T/883
MTR28515T/883
Output Voltage
(Main and aux. Vout for triple models)
Number of Outputs
(S = single, D = dual, T = triple)
Case Option
("F" indicates flanged option, non-flanged
case has no designator in this position)
Screening
(Standard screening has no designator
in this position.)
To indicate the flanged case option change the “X” to “Z” In the SMD
number. The SMD number shown is for Class H screening, non-flanged.
For exact specifications for an SMD product, refer to the SMD drawing.
SMDs can be downloaded from:
http://www.dscc.dla.mil/programs/smcr
O
n
the lines belOw
,
enter One selectiOn frOm each categOry tO determine the mOdel number
.
MODEl SElECTION
CaTEgORy
MTR28
Base Model and
Input Voltage
Output Voltage
1
3R3, 05, 12, 15, 18
Number of
Outputs
2
S
D
T
Case Option
3
(NON-FLANGED
leave blank)
F (FlaNgED)
/
Screening
4
(STANDARD leave blank)
ES
883 (ClaSS H)
SElECTION
MTR28 is the only
available selection
05, 12, 15
512, 515
Notes:
1. Output Voltage: An R indicates a decimal point. 3R3 is 3.3 volts out. The value of 3R3 is only available in single output models. The 512 and 515 triple output converters
are +5 volt main and ±12 or ±15 volt auxiliaries.
2. Number of Outputs: S is a single output, D is a dual output, and T is a triple output
3. Case Options: For the standard case (cases F1, H2 and H4) leave the case option blank. For the flanged case option (cases J1, K3 and K5), insert the letter F in the
Case Option position.
4. Screening: For standard screening leave the screening option blank. For other screening options, insert the desired screening level. For more information see Screening
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