F
EATURES
•
•
•
•
•
•
•
•
•
•
•
–55° to +125°C operation
16 to 40 VDC input
Fully isolated
Magnetic feedback
Fixed frequency 600 kHz typical
Topology – Single Ended Forward
50 V for up to 50 ms transient protection
Inhibit and synchronization functions
Indefinite short circuit protection
Up to 30 watts output power
Trim and remote sense on single
output models
• Up to 84% efficiency
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MTR SERIES
30 WATT
MODELS
VDC O
UTPUT
SINGLE
DUAL
TRIPLE
3.3
±5
+5 &
5
±12
±12
12
±15
+5 &
15
±15
18
Size (max): Non-flanged: Single and dual output models, case H2 (H4 for MTR Dual with standard or ES screening, ht 0.417", 10.59 mm)
2.125 x 1.125 x 0.400 inches (53.98 x 28.58 x 10.16 mm)
Triple output models, case F1, 1.950 x 1.350 x 0.405 inches (49.53 x 34.29 x 10.29 mm)
Flanged:
Single and dual output models, case K3 (or K5 for MTR Dual with standard or ES screening, ht. 0.417", 10.59 mm)
2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm)
Triple output models, case J1, 2.720 x 1.350 x 0.405 inches (69.09 x 34.29 x 10.29 mm)
Single and dual non-flanged 50 grams max., flanged 52 grams max.
Triple non-flanged 58 grams max., flanged 62 grams max.
Screening: Standard, ES, or 883 (Class H).
Weight:
DESCRIPTION
The 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% effi-
ciency. MTR converters are packaged in hermetically sealed metal
cases, making them ideal for use in military, aerospace and other
high reliability applications.
S
YNCHRONIZATION
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 quasi-TTL signal at any duty cycle
between 40% and 60%. The sync pin must be connected to input
common pin when not in use.
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 and shunt
regulators. 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 500 mA load is main-
tained 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.
MTR converters are provided with internal filtering capacitors that
help reduce the need for external components in normal operation.
For systems that require compliance with MIL-STD-461C’s CE03
standard, Interpoint offers filter/transient suppression modules
(including the FMC-461, FMD-461 and FM-704A series filters) which
will result in compliance. Contact your Interpoint representative for
further details.
W
IDE
V
OLTAGE
R
ANGE
MTR converters are designed to provide full power operation over a
full 16 to 40 VDC voltage range. Operation below 16 volts, including
MIL-STD-704E emergency power conditions is possible with
derated power. Refer to the low line dropout graph (Figure 22) for
details.
I
MPROVED
D
YNAMIC
R
ESPONSE
The MTR Series feed-forward compensation system provides excel-
lent dynamic response and noise rejection. Audio rejection is typi-
cally 50 dB. The minimum to maximum step line transient response
is typically less than 4%.
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 a TTL
compatible low (≤0.8 V) is applied to the inhibit pin. The unit is
enabled when the pin, which is internally connected to a pull-up
resistor, is left unconnected or is connected to an open-collector
gate. The open circuit output 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.
89
MTR SERIES
30 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 VDC
Output Power
• 25 to 30 watts depending on model
Lead Soldering Temperature (10 sec per pin)
• 300°C
Storage Temperature Range (Case)
• –65°C to +135°C
DC/DC C
ONVERTERS
SYNC AND INHIBIT
Sync (500 to 675 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min, 5 V max
• Referenced to input common
• If not used, connect to input common
Inhibit TTL Open Collector
• Logic low (output disabled)
Voltage
≤0.8
V
Inhibit pin current 8.0 mA max
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical single and dual outputs
• 200 ppm/°C main, 300 ppm/°C aux
triple output
Input to Output Capacitance
• 50 pF typ (100 pF typ triple outputs)
Current Limit
• 115% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 40 dB typ (50 dB typ triple output)l
Conversion Frequency
• Free run 550 min, 600 typ, 650 max kHz
• External sync 500 to 675 kHz
Inhibit Pin Voltage (unit enabled)
• 9 to 11 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for 50 msec transient
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
1
OUTPUT POWER
1
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
2
LOAD REGULATION
INPUT VOLTAGE
1
NO LOAD TO FULL
INPUT CURRENT
1
CONDITION
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz – 2 MHz
Tc = –55°C TO +125°C
Vin = 16 to 40 VDC
Tc = –55°C TO +125°C
NO LOAD TO FULL
Tc = –55°C TO +125°C
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
10 kHz – 10 MHz
Tc = –55°C TO +125°C
SHORT CIRCUIT
POWER DISSIPATION
RECOVERY
1, 4
50% – 100% – 50%
TRANSIENT
RECOVERY
4
16 – 40 – 16 VDC
TRANSIENT
5
RECOVERY
4
DELAY
OVERSHOOT
FULL LOAD
NO LOAD
MTR283R3S
MIN
3.27
0
0
—
—
—
—
—
—
16
—
—
—
—
—
74
—
—
—
—
—
—
—
—
—
TYP
3.30
––
—
15
—
5
—
2
—
28
—
30
0.94
7
25
76
—
1.4
MAX
3.33
6.06
20
40
50
10
10
10
10
40
50
75
—
8
50
—
10
6
MTR2805S
MIN
4.95
0
0
—
—
—
—
—
—
16
—
—
—
—
—
76
—
—
—
—
—
—
—
—
—
TYP
5.00
—
—
35
50
10
15
5
15
28
—
35
1.15
3
20
78
—
1.4
MTR2812S
MTR2815S
MTR2818S
MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
5.05 11.88 12.00 12.12 14.85 15.00 15.15 17.82 18.00 18.18 VDC
5.0
0
—
2.5
0
—
2.0
0
—
1.67
A
25
50
90
30
50
30
50
40
50
75
—
8
50
—
10
5
0
—
—
—
—
—
—
16
—
—
—
—
—
80
—
—
—
—
—
—
—
—
—
—
25
40
10
15
5
15
28
—
35
1.30
3
20
83
—
1.4
30
50
90
30
50
30
50
40
50
75
—
8
50
—
10
5
0
—
—
—
—
—
—
16
—
—
—
—
—
81
—
—
—
—
—
—
—
—
—
—
25
40
10
15
5
15
28
—
35
1.25
3
20
84
—
1.4
30
50
90
30
50
30
50
40
50
75
—
8
50
—
10
5
0
—
—
—
—
—
—
16
—
—
—
—
—
81
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
28
—
—
1.33
—
—
—
—
1.4
—
60
±500
300
—
0
—
30
40
90
30
50
30
50
40
50
50
—
8
50
—
10
—
W
mV p-p
mV
mV
VDC
V
mA
A
mA
mA p-p
%
W
ms
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
3
STEP LOAD RESP.
±125 ±250
—
200
—
—
1.4
0
33
±300
300
5
50
150
±200 ±300
60
200
±200 ±300
—
300
1.4
0
50
5
50
250
±250 ±400
60
200
±400 ±500
—
300
1.4
0
120
5
120
600
±350 ±500
60
200
±500 ±600
—
300
1.4
0
150
5
150
750
±600 mV pk
—
µs
—
—
5
—
—
mV pk
µs
ms
STEP LINE RESP.
START-UP
1
mV pk
Notes
1. Tc = –55°C to +125°C
2. Operation is limited below 16V (see Figure 22).
3. Indefinite short circuit protection not guaranteed above 125°C case.
4. Recovery time is measured from application of the transient to point at which
Vout is within 1% of final value.
5. Transition time
≥10
µs.
90
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
1, 2
OUTPUT POWER
1, 2
OUTPUT RIPPLE
VOLTAGE +/– V
OUT
LINE REGULATION
3
V
IN
= 16 TO 40 VDC
Tc = –55°C
TO +125°C
LOAD REGULATION
NO LOAD TO FULL
Tc = –55°C
TO +125°C
CROSS REGULATION
EFFECT ON –V
OUT
INPUT VOLTAGE
1
NO LOAD TO FULL
INPUT CURRENT
SEE NOTE 4
SEE NOTE 5
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
10 kHz - 10 MHz
POWER DISSIPATION
SHORT CIRCUIT
1
RECOVERY
50 – 100 – 50% BALANCED
TRANSIENT
RECOVERY
7
STEP LINE
RESPONSE ± V
OUT
START–UP
1
16 – 40 – 16 V
IN
TRANSIENT
8
RECOVERY
7
DELAY
OVERSHOOT
FULL LOAD
NO LOAD
—
—
0
50
50
250
—
—
0
120
120
600
—
—
0
150
CONDITIONS
+V
OUT
–V
OUT
V
IN
= 16 TO 40 VDC
V
IN
= 16 TO 40 VDC
10 kHz - 2 MHz
Tc = –55°C TO +125°C
+V
OUT
–V
OUT
+V
OUT
–V
OUT
+V
OUT
–V
OUT
+V
OUT
–V
OUT
MTR2805D
MIN
TYP
MAX
4.95
5.00
5.05
4.92
0
0
—
—
—
—
—
—
—
—
—
—
—
—
16
0
—
—
—
—
76
—
—
—
—
—
—
—
5.00
2.5
—
20
40
10
50
10
50
5
25
5
25
7
4
28
—
35
1.10
3
15
78
—
1.4
±200
100
±200
—
1.4
5.07
4.5
25
50
80
50
100
50
100
30
50
50
100
12
6
40
50
75
—
8
50
—
10
5.0
±300
200
±400
300
5
MTR2812D
MIN
TYP
MAX
11.88 12.00 12.12
11.82
0
0
—
—
—
—
—
—
—
—
—
—
—
—
16
0
—
—
—
—
78
—
—
—
—
—
—
—
12.00
1.25
—
30
40
10
50
10
50
15
30
15
30
4
4
28
—
50
1.34
3
20
81
—
1.4
±150
100
±200
—
1.4
12.18
2.25
30
80
120
30
120
50
150
30
120
50
180
8.3
6
40
50
75
—
8
50
—
10
5.0
±300
200
±400
300
5
MTR SERIES
30 WATT
MTR2815D
MIN
TYP
MAX
14.85 15.00 15.15
14.77 15.00
0
0
—
—
—
—
—
—
—
—
—
—
—
—
16
0
—
—
—
—
80
—
—
—
—
—
—
—
1.0
—
25
40
10
50
10
50
15
30
15
30
3
4
28
—
50
1.29
3
20
83
—
1.4
±200
100
±400
—
1.4
15.23
1.8
30
80
120
30
150
50
180
30
150
50
180
8
6
40
50
75
—
8
50
—
10
5.0
±400
200
±500
300
5
150
750
%
VDC
V
mA
A
mA
mA p-p
%
W
ms
mV pk
µs
mV pk
µs
ms
mV
mV
A
W
mV p-p
UNITS
VDC
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
INPUT RIPPLE
CURRENT
1
EFFICIENCY
LOAD FAULT
6
STEP LOAD
RESPONSE ± V
OUT
mV pk
Notes
1. Tc = –55°C to +125°C.
2. Up to 90% of the total output current/power is available from either output
providing the positive output is carrying at least 10% of the total output
power.
3. Operation is limited below 16 V (see Figure 22).
4. Effect on the negative output under the following conditions:
+P
out
20% to 80%; –P
out
80% to 20%
5. Effect on the negative output under the following conditions:
+P
out
50%; –P
out
10% to 50%
6. Indefinite short circuit protection not guaranteed above 125°C case.
7. Recovery time is measured from application of the transient to point at which
Vout is within 1% of final value.
8. Transition time
≥
10 µs.
91
MTR SERIES
30 WATT
TRIPLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
DC/DC C
ONVERTERS
MTR28512T
CONDITION
MAIN
+ AUXILIARY
– AUXILIARY
MIN
4.95
11.82
11.82
0.5
—
—
—
—
—
—
MAIN
± AUXILIARY
—
—
—
—
—
—
16
—
—
—
—
—
72
POWER DISSIPATION
SHORT CIRCUIT
ALL OUTPUTS SHORTED TOTAL
RECOVERY EACH OUTPUT
MAIN
± AUXILIARY
MAIN
± AUXILIARY
MAIN
± AUXILIARY
MAIN
± AUXILIARY
—
—
—
—
—
—
—
—
—
—
—
—
1.4
150
500
0.05
3
150
100
1.4
0
0
14
2.0
250
750
0.10
5
250
250
2.0
500
1500
—
—
—
—
—
—
—
—
—
—
—
—
1.4
150
500
0.05
2
150
100
1.4
0
0
14
2.0
250
750
0.10
5
250
250
2.0
500
1500
W
ms
mV
ms
mV
ms
mV
TYP
5.0
12.0
12.0
—
0.416
0.416
20
5
5
—
50
20
10
25
10
30
28
—
70
1.37
3.0
20
75
MAX
5.05
12.18
12.18
4.0
0.750
0.750
20
9
9
30
115
80
20
60
20
75
40
50
100
1.45
8
40
—
MIN
4.95
14.77
14.77
0.5
—
—
—
—
—
—
—
—
—
—
—
—
16
—
—
—
—
—
73
MTR28515T
TYP
5.0
15.0
15.0
—
0.333
0.333
20
5
5
—
50
20
10
30
10
30
28
—
70
1.37
3.0
20
75
MAX
5.05
15.23
15.23
4.0
0.600
0.600
20
9
9
30
115
80
20
75
50
75
40
50
100
1.45
8
40
—
mA
A
mA
mA p-p
%
VDC
mV
mV p-p
mV
W
A
VDC
UNITS
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
OUTPUT CURRENT
1
V
IN
= 16 TO 40
OUTPUT POWER
1
V
IN
= 16 TO 40
MAIN
+ AUXILIARY
– AUXILIARY
MAIN
+ AUXILIARY
– AUXILIARY
TOTAL
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
V
IN
= 16 TO 40
LOAD REGULATION
2, 3
INPUT VOLTAGE
10 kHz to 2 MHz
MAIN
±AUXILIARY
MAIN
± AUXILIARY
CONTINUOUS
TRANSIENT 50 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
INPUT RIPPLE CURRENT
EFFICIENCY
LOAD FAULT
4
10 kHz TO 10 MHz
STEP LOAD RESPONSE
TRANSIENT
5
RECOVERY
6
STEP LINE RESPONSE
V
IN
= 16 TO 40
START-UP
TRANSIENT
DELAY
OVERSHOOT
Notes
1. The sum of the two aux outputs is not to exceed 10 watts. The maximum
load per aux output is 9 watts.
2. To maintain regulation when operating the ±Aux at full load, a minimum load
of 500 mA is required on the main.
3. Measured on each output one at a time with the other outputs at full load.
4. Indefinite short circuit protection not guaranteed above 125°C (case).
5. Response of each output as all outputs are simultaneously transitioned.
Main: 50% - 100% - 50% of main full load
Auxiliaries: 25% - 50% - 25% each, of total auxiliary full load
6. Recovery time is measured from application of the transient to point at
which Vout is within 1% of regulation.
92
DC/DC C
ONVERTERS
TRIM AND REMOTE SENSE (AVAILABLE ON SINGLE OUTPUT MODELS ONLY)
MTR SINGLE OUTPUT CONVERTER
1
+VIN
OUTPUT
COMMON
SENSE
RETURN
SENSE
INPUT
COMMON
POSITIVE
OUTPUT
4
1
3
6
1
RT
5
10
RL
SENSE
INPUT
COMMON
POSITIVE
OUTPUT
1
+VIN
OUTPUT
COMMON
SENSE
RETURN
MTR SERIES
30 WATT
4
2
3
6
2
RL
MTR SINGLE OUTPUT CONVERTER
10
5
EXTERNAL TRIM CONNECTION
1 Make connections at converter.
REMOTE SENSE CONNECTION
2 Make connections at load.
F
IGURE
1: T
RIM
C
ONNECTION1, 2, 3
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
2: R
EMOTE
S
ENSE2, 3
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 to
maintain specified performance.
2. If neither voltage trim nor remote sense will be used, connect pin 3 to
pin 4 and pin 5 to pin 6 or the output voltage will increase by 1.2 volts.
3. CAUTION: The converter will be permanently damaged if the positive
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.
PIN OUT
Dot on top of cover indicates pin one.
Pin
1
2
3
4
5
6
7
8
9
10
Single Output
Positive Input
Inhibit
Sense Return
Output Common
Positive Output
Positive Sense
Case Ground
Case Ground
Sync
Input Common
Dual Output
Positive Input
Inhibit
Positive Output
Output Common
Negative Output
Case Ground
Case Ground
Case Ground
Sync
Input Common
Triple Output
Positive Input
Main (+5) Output
Output Common
Neg. Aux. Output
Pos. Aux. Output
Case Ground
Case Ground
Inhibit
Sync
Input Common
1
2
3
4
5
BOTTOM VIEW
MTR SINGLE
FLANGED AND NON-FLANGED
10
9
8
7
6
Dotted line outlines flanged package option.
See pages 10, 13, and for dimensions.
F
IGURE
3: P
IN
O
UT
S
INGLE
O
UTPUT
M
ODELS
Dot on top of cover indicates pin one.
Squared corner and dot on top
of package indicate pin one.
1
1
2
3
4
5
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 pages 10, 11, 13, 14, and 15 for dimensions.
Dotted line outlines flanged package option.
See pages 9 and 12 for dimensions.
F
IGURE
4: P
IN
O
UT
D
UAL
O
UTPUT
M
ODELS
F
IGURE
5: P
IN
O
UT
T
RIPLE
O
UTPUT
M
ODELS
1
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