F
EATURES
•
•
•
•
•
•
•
•
•
•
–55°C to +85° C operation
9 to 16 or 16 to 36 VDC input
Fully isolated
Opto-coupler feedback
Fixed frequency, 250 kHz typical
Topology – Push-Pull Forward
50 V for 50 ms transient protection
Inhibit function
Indefinite short circuit protection
Up to 79% efficiency
DC/DC C
ONVERTERS
12 & 28 V
OLT
I
NPUT
MTO SERIES
15 WATT
MODELS
VDC O
UTPUT
TRIPLE
+5 & ±12
+5 & ±15
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 Section B8, cases F4 and J5, for dimensions.
Weight:
53 grams typical
Screening: Standard or ES. See Section C2 for screening options, see Section A5 for
ordering 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
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 uncon-
nected 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.
C
ONVERTER
D
ESIGN
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.
P
ACKAGING
MTO converters are packaged in hermetically sealed metal cases.
The cases are constructed of cold-rolled steel with a fused tin finish.
MTO converters can be purchased in a flanged or non-flanged case.
The flanged option provides increased heat dissipation and also
provides greater stability when mechanically secured.
B4-23
MTO SERIES
15 WATT
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
DC/DC C
ONVERTERS
INHIBIT
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
TYPICAL CHARACTERISTICS
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
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• MTO12XXT 9 to 16 VDC continuous
• MTO28XXT 16 to 36 VDC continuous
• MTO12XXT 25 V for 50 msec transient
• MTO28XXT 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
Electrical Characteristics: 25°C Tc, 28 VDC Vin (12 VDC for 12V models), 100% load, unless otherwise specified.
MTO1212T
PARAMETER
OUTPUT VOLTAGE
CONDITION
MAIN
+ AUXILIARY
– AUXILIARY
OUTPUT CURRENT
MAIN
1
AUXILIARY
MAIN
OUTPUT POWER
+ AUXILIARY
– AUXILIARY
TOTAL
OUTPUT RIPPLE
VOLTAGE, BW = 1 MHZ
LINE REGULATION
V
in
= MIN. TO MAX.
LOAD REGULATION
NO LOAD TO FULL
INPUT VOLTAGE
MAIN
± AUXILIARY
MAIN
±AUXILIARY
MAIN
± AUXILIARY
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
INPUT CURRENT
INPUT RIPPLE
CURRENT
EFFICIENCY
—
76
50
79
100
—
—
76
50
79
100
—
—
76
20
79
50
—
—
76
20
79
50
—
mA p-p
%
FULL LOAD
INHIBITED
MIN
4.95
11.88
11.88
100
—
—
—
—
—
—
—
—
—
—
—
9
—
—
—
—
TYP
5.0
12.0
12.0
—
—
—
—
—
—
—
—
5
30
10
30
12
—
—
—
8
MAX
5.05
MTO1215T
MIN
4.95
TYP
5.0
15.0
15.0
—
—
—
—
—
—
—
—
5
30
10
30
12
—
—
—
8
MAX
5.05
15.15
15.15
2000
±167
10.0
2.5
2.5
15
80
30
10
60
20
60
16
25
60
1670
10
MTO2812T
MIN
4.95
11.88
11.88
100
—
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
TYP
5.0
12.0
12.0
—
—
—
—
—
—
—
—
5
30
10
30
28
—
—
—
8
MAX
5.05
12.12
12.12
2000
±208
10.0
2.5
2.5
15
80
30
10
48
20
48
36
50
30
700
10
MTO2815T
MIN
4.95
14.85
14.85
100
—
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
TYP
5.0
15.0
15.0
—
—
—
—
—
—
—
—
5
30
10
30
28
—
—
—
8
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
mA
VDC
V
mV
mV p-p
mV
W
mA
VDC
UNITS
12.12 14.85
12.12 14.85
2000
±208
10.0
2.5
2.5
15
80
30
10
48
20
48
16
25
60
1670
10
100
—
—
—
—
—
—
—
—
—
—
—
9
—
—
—
—
Note
1. Minimum load required for full output capability on auxiliary outputs. Minimum current can be reduced when dual outputs are used at reduced loads.
B4-24
DC/DC C
ONVERTERS
Positive 1
Input
Pre-
Regulator
MTO SERIES
15 WATT
2
+5 V
out
Pulse
Width
Modulator
Error
Amp
3
Output
Common
Short Circuit Amp
Input 10
Common
8
Inhibit
Case Ground
7
Pass Transistor
5
Positive
Auxiliary
Output
Linear
Regulator
Linear
Regulator
4
Pass Transistor
Negative
Auxiliary
Output
F
IGURE
1: S
IMPLIFIED
S
CHEMATIC
Positive
Input
Optional
Pullup
2N3904
Inhibit
10K
3.9K
Input
Common
(1)
BIAS
(2)
13V
3K
(10)
9K
F
IGURE
2: I
NHIBIT
I
NTERFACE
E
XAMPLE
B4-25
MTO SERIES
15 WATT
Pin
1
2
3
4
5
6
7
8
9
10
DC/DC C
ONVERTERS
PIN OUT
Squared corner and dot on
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 Section B8, Cases F4 and J5, for dimensions
F
IGURE
3: P
IN
O
UT
Typical Performance Curve: 25°C Tc
MODEL NUMBERING KEY
MTO
Base Model
Input Voltage
12 12
T
F / ES
82
18 VIN
80
78
EFFICIENCY (%)
76
74
72
70
68
66
2
4
6
8
10
12
14
16
36 VIN
28 VIN
Output Voltage
(Aux. Vout)
Number of Outputs
(T = triple)
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
B4-26
24223-001-DTS Rev A
DQ# 1021
All technical 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. MTO Series is a trademark of Interpoint.
Copyright © 1990 - 1999 Interpoint. All rights reserved.
CASE F
C
ASES
Dot on top of case indicates pin one
Materials
Header Case F1
Cold Rolled Steel/Nickel/Gold
Cases F2 - F4
Cold Rolled Steel/Nickel/Tin
Cover Case F1
Kovar/Nickel
Cases F2 - F4
Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy (all cases)
MHV Series Triple – compression glass seal
MTR Series Triple, case F1 – ceramic seal
MTR Series Triple, case F2 – compression glass seal
HUM40 – compression glass seal or ceramic seal
Case F3 – compression glass seal
Case F4 – compression glass seal or ceramic seal
Case dimensions in inches (mm)
Tolerance
±0.005
(0.13) for three decimal places
±0.01
(0.2) for two decimal places
unless otherwise specified
CASE F
BOTTOM VIEW
See Figures 20 - 23 for pin configuration
1.350 max
(34.29)
1.950 max
(49.53)
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.
F
IGURE
19: C
ASE
F M
AXIMUM
D
IMENSIONS
BOTTOM VIEW CASE F1
MTR Series Triple and MHV Series Triple: Screening – Standard, ES, or 883
Bathtub
Platform
Dot on top of case indicates pin one
1.170
(29.72)
0.040 dia.
(1.02)
MHV
Series
MTR
Series
Seam Seal
1
2
3
4
5
10
0.170
(4.32)
0.000
0.25 (6.4)
0.405 max
(10.29)
0.000
0.000
0.170
(4.32)
9
8
7
6
0.570
(14.48)
0.970
(24.64)
1.370
(34.80)
0.405 max
(10.29)
Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer
to the numerical dimensions for accuracy.
B8-12
0.25 (6.4)
F
IGURE
20: C
ASE
F1
1.770
(44.96)
0.000
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