FEATURES
• –55° to +125°C operation
• 16 to 40 VDC input
• Fully isolated
MTR SERIES
30 WATT
DC/DC CONVERTERS
28 VOLT NPUT
I
• Magnetic feedback
MODELS
VDC OUTPUT
• 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
SINGLE
3.3
5
DUAL
5
12
TRIPLE
+5 &
12
12
15
18
15
+5 &
15
• Up to 84% efficiency
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)
Weight:
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).
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.
SYNCHRONIZATION
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.
CONVERTER DESIGN
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.
WIDE VOLTAGE RANGE
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.
IMPROVED DYNAMIC RESPONSE
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%.
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.
INHIBIT FUNCTION
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.
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.
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