Crane Aerospace & Electronics Power Solutions
MSA/MGA Single and Dual DC-DC Converters
28 Volt input – 5 Watt
Features
small size, 1.16 in
2
(7.46 cm
2
) - Msa
surface mount package - MGa
• –55° to +125°C operation
• 16 to 40 VDC input
• Fully isolated
• 50 V for 50 ms transient protection
• Fixed high frequency switching
• Inhibit function
• Indefinite short circuit protection
VDC O
utput
MoDels
SINGLE
5
5.2 (MSA only)
12
15
DUAL
±5
±12
±15
• Up to 76% efficiency
Description
The Interpoint™ MSA Series™ and MGA Series™ of dc-dc
converters provide up to 5 watts of output power over the full
military temperature range with up to 76% efficiency. Thick-film
hybrid techniques provide military/aerospace reliability levels and
optimum miniaturization.
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.
See “Table 12: Element Evaluation” on page 14 and “Table 13:
Environmental Screening” on page 15 for screening options
and descriptions.
The converters are switching regulators that use a flyback
converter design with a constant switching frequency of 550 kHz
typical. They are regulated, isolated units using a pulse width
modulated topology and are built as high reliability thick-film
hybrids. Isolation between input and output circuits is provided
with a transformer in the forward power path and an optical
link in the feedback control loop. Excellent input line transient
response and audio rejection is achieved by an advanced feed-
forward compensation technique. Negative output regulation is
maintained by tightly coupled magnetics. Up to 4 watts, 80% of
the total output power, is available from either output, provided
that the opposite output is simultaneously carrying 20% of the
total power in order to maintain the specified regulation on the
negative output. A predictable current limit is accomplished by
direct monitoring of the output load current, which results in a
constant current output. Internal input and output filters eliminate
the need for external capacitors for stable operation. Output filter
examples in “Figure 3: Low Noise Output Filter MSA and MGA
Single Output Models” on page 3 and “Figure 4: Low Noise
Output Filter MSA and MGA Dual Output Models” on page 3
provide suggested solutions for systems where very low output
ripple is required.
W
iDe
v
oltage
r
ange
C
onverter
D
esign
The MSA 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. Low-line drop out graphs, “Figure 17” on
page 10 and “Figure 23” on page 11, graphs provide more
information.
The feed-forward compensation system rovides excellent
p
dynamic response and noise rejection. Audio rejection is typically
50 dB. The minimum to maximum step line transient response is
typically less than 1%.
i
mproveD
D
ynamiC
r
esponse
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
Page 1 of 15
MSA_MGA Rev AC - 2013.06.13
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
