not reCoMMenDeD For neW DesIGns
Features
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DC/DC C
onverters
28 v
olt
I
nput
mTO seRIes
15 WATT
–55°C to +85° C operation
16 to 36 VDC input
Fully isolated
50 V for 50 ms transient protection
Fixed frequency switching
Inhibit function
Indefinite short circuit protection
Up to 79% efficiency
mODels
VDC O
utput
+5 & ±12
+5 & ±15
triple
size (max.): Non-flanged, case F4, 1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm)
Flanged, case J5, 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)
see cases F4 and J5 for dimensions.
Weight:
53 grams typical
screening: standard or es. see screening table for more information.
Description
Interpoint’s mTO series™ of DC/DC converters delivers 15 watts of output
power with three output voltages and a choice of two input voltage ranges.
The mTO series converters are packaged in hermetically sealed metal
cases and operate at full load over a case temperature range of -55°C to
+85°C (measured at the base plate of the converter).
F
eatures
C
OnVerter
D
esign
An inhibit terminal, pin 8, provides shut-down and start-up control. Applying
a logic low (<0.8 V) will disable the output of the converter reducing input
current to 8 mA, typical. leaving the terminal unconnected or connecting it
to Vin will enable the converter. The inhibit pin has an open circuit voltage
of approximately 10 volts.
soft-start provides a controlled 20 milliseconds turn-on to minimize inrush
current and reduce overshoot at initial start-up or when inhibit is released.
Internal current limiting circuitry protects all three outputs against short
circuits. When output power exceeds approximately 125% of maximum
output power, the output currents are limited. In addition, separate current
limiting circuitry protects each output individually.
mTO converters are packaged in hermetically sealed metal cases. The cases
are constructed of cold-
rolled steel with a fused tin
2
finish. mTO converters can
+5 V
out
be purchased in a flanged
or non-flanged case. The
flanged option provides
Error
Amp
increased heat dissipation
3
Output
and also provides greater
Common
stability when mechanically
secured.
5
Positive
Auxiliary
Output
The push-pull forward topology coupled with pulse-width modulation
minimizes output noise and maintains good regulation. Nominal switching
frequency is 250 kHz. Although an internal input filter reduces input ripple
current, for applications requiring conformance to mIl-sTD-461C, Ce03,
use the mTO in conjunction with Interpoint’s Fm-461 emI filter.
Operating at maximum ratings may require removing self-generated heat.
To increase heat dissipation, heat conducting material can be used in
contact with the converter’s base plate. Interpoint’s Thermal mounting Pad
(TmP), model TmP-002, is designed for use with the mTO converter.
Positive 1
Input
Pre-
Regulator
p
aCkaging
Pulse
Width
Modulator
Short Circuit Amp
Input 10
Common
8
Inhibit
Case Ground
7
Pass Transistor
Linear
Regulator
Linear
Regulator
4
Pass Transistor
F
igure
1: s
impliFieD
s
ChematiC
Negative
Auxiliary
Output
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
Page 1 of 6
MTO Rev C 20100212
DC/DC C
onverters
absolute maximum ratings
output power
• 15 watts
Lead soldering temperature (10 sec per lead)
• 300°C
storage temperature range (case)
• –65°C to +125°C
input Voltage range
• 16 to 36 VDC continuous
• 50 V for 50 msec transient
case operating temperature (tc)
• –55°C to +85°C full power
• –55°C to +115°C absolute
Derating output power/current
• linearly from 100% at 85°C to 0% at 115° C
mTO seRIes
15 WATT
recommended operating conditions
output Voltage temperature coefficient
• 150 ppm/°C typical
input to output capacitance
• 80 pF typical
current Limit
• 125% of full load typical
isolation
• 100 megohm minimum at 500 V
conversion Frequency
• 250 kHz typical
inhibit pin Voltage (unit enabled)
• 10 V typical
typical characteristics
inhibit ttL open collector
• logic low (output disabled)
V = <0.8 V
Inhibit pin current < 2.0 mA
• Referenced to input common
• logic high (output enabled)
Unconnected or connected to Vin
inhibit
electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
TRIPle OUTPUT mODels
parameter
Output VOltage
mTO2812T
min
4.95
11.88
11.88
100
—
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
76
tYp
5.0
12.0
12.0
—
—
—
—
—
—
—
—
5
30
10
30
28
—
—
—
8
20
79
maX min
5.05 4.95
mTO2815T
tYp
5.0
15.0
15.0
—
—
—
—
—
—
—
—
5
30
10
30
28
—
—
—
8
20
79
maX
5.05
15.15
15.15
2000
±167
10.0
2.5
2.5
15
80
30
10
60
20
60
36
50
30
700
10
50
—
COnDitiOns
main
units
+
auXiliarY
-
auXiliarY
Output Current
main1
auXiliarY
Output pOwer
main
12.12 14.85
12.12 14.85
2000
100
±208 —
10.0 —
2.5
2.5
15
80
30
10
48
20
48
50
30
700
10
50
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
76
VDC
mA
+
auXiliarY
-
auXiliarY
tOtal
Output ripple
bw
= 1 mh
z
line regulatiOn
V
in
=
min tO maX
lOaD regulatiOn
nO lOaD tO Full
input VOltage
main
W
±
auXiliarY
main
mV p-p
mV
mV
VDC
V
mA
±
auXiliarY
main
±
auXiliarY
COntinuOus
transient
50 ms
36 16
input Current
nO lOaD
Full lOaD
inhibiteD
input ripple Current
eFFiCienCY
mA p-p
%
Notes
1. minimum load required for full output capability on auxiliary outputs. minimum current can be reduced when dual outputs are used at reduced
loads.
www.interpoint.com
Page 2 of 6
MTO Rev C 20100212
DC/DC C
onverters
Positive
Input
(1)
Optional
Pullup
2N3904
Inhibit
10K
3.9K
Input
Common
(10)
(2)
13V
3K
BIAS
mTO seRIes
15 WATT
9K
F
igure
2: i
nhibit
i
nterFaCe
e
Xample
pin out
Squared corner and dot on
pin
1
2
3
4
5
6
7
8
9
10
designation
Positive Input
+5 VDC Output
Output Common
Negative Aux. Output
Positive Aux. Output
No Connection
Case Ground
Inhibit
No Connection
Input Common
top of cover indicate pin one.
1
2
3
4
5
BOTTOM VIEW
MTO
10
9
8
7
6
Dotted line outlines flanged package option.
see cases F4 and J5 for dimensions
F
igure
3: p
in
O
ut
Typical Performance Curve: 25°C Tc
model numbering key
EFFICIENCY (%)
82
80
78
76
74
72
70
68
66
2
4
6
8
10
12
14
16
36 VIN
18 VIN
28 VIN
Output Voltage
(Aux. Vout)
Number of Outputs
(T = triple)
Base Model
Input Voltage
MTO
28 12
T
F / ES
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
Output Power (Watts)
Representative of all models
mTO2815T efficiency
F
igure
4
www.interpoint.com
Page 3 of 6
MTO Rev C 20100212
DC/DC C
onverters
BOTTOM VIEW CASE F4
mTO seRIes
15 WATT
Solder Seal
1.350 max (4.39)
1.173
(29.79)
Squared corner and dot on top
of case indicate pin one.
0.040 dia.
(1.02)
1
2
3
4
5
Solder Tip-off
0.173
(4.39)
0.000
10
9
8
7
6
Seal hole: 0.083 ±0.003 (2.11 ±0.08)
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device.
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin.
Materials
Header
Cold Rolled Steel/Nickel/Tin
Cover
Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy, compression glass seal or ceramic seal
Case F4, Rev C, 20060802
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2006 Interpoint Corp. All rights reserved.
F
igure
5: C
ase
F4
www.interpoint.com
Page 4 of 6
MTO Rev C 20100212
1.950 max (49.53)
0.505 max
(12.83)
0.170 (4.32)
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
1.770 (44.96)
0.000
0.250/0.300
(6.35/7.62)
0.000
DC/DC C
onverters
BOTTOM VIEW CASE J5
mTO seRIes
15 WATT
Solder Seal
1.350 max. (34.29)
1.173
(29.79
0.040 dia.
(1.02)
0.673
(17.09)
Squared corner and dot on top
of case indicate pin one.
1
2
3
4
5
0.162 dia.
(4.11)
Solder Tip-off
0.173
(4.39)
0.000
10
9
8
7
6
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
2.720 max
(69.09)
Flange thickness: 0.073 (1.85) max.
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device.
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin.
Case J5, Rev E, 20100211
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2010 Interpoint Corp. All rights reserved.
F
igure
6: C
ase j
5
www.interpoint.com
Page 5 of 6
MTO Rev C 20100212
1.770 (44.96)
2.150 (54.61)
0.505 max
(12.83)
0.000
0.25 (6.4)
0.210
(5.33)
0.000
0.170 (4.32)
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