Crane Aerospace & Electronics Power Solutions
SMSA Single and Dual DC-DC Converters
28 Volt input – 5 Watt
Features
radiation tolerant space dc-dc converter
•
Operating temperature -55°C to +125°C
• Input voltage range 16 to 40 V
•
Fully isolated
•
total ionizing dose (tid) guaranteed to 100 krad(si)
rHa level r, per MiL-std-883 method 1019
•
Qualified to MIL-PRF-38534 Class H and K
• Transient protection 50 V for 50 ms
•
Fixed high frequency switching
•
Inhibit function
•
Indefinite short circuit protection
•
single event effects (see) Let performance to
86 MeV cm
2
/mg
MODELS
o
utput
v
oltage
(v)
SIngLE
3.3
5
5.2
12
15
DuAL
±5
±12
±15
•
High power density, 74% efficiency
The Interpoint
®
SMSA Series™ of high frequency, space
qualified, dc-dc converters provide up to 5 watts output power
over the full military temperature range of -55°C to +125°C
with up to 74% efficiency. Thick-film hybrid techniques provide
military/aerospace reliability levels and optimum miniaturization.
The hermetically sealed case is 1.075 by 1.075 inches with
a height of 0.270 inches. Power density for the SMSA Series
converters is 16 watts per cubic inch. The SMSA Series’ small
size, light weight and hermetically sealed metal packages make
them ideal for use in space, military, aerospace and other high
reliability applications.
SMSA converters offer the following screening options: Space
Prototype (O), Class H, or Class K. Radiation tolerant to radiation
hardness assurance (RHA) levels of “-” (O), “P” or “R”, per
MIL-STD-38534. Interpoint model numbers use an “O” in the
RHA designator position to indicate the “-” (dash) RHA level of
MIL-PRF-38534, which is defined as “no RHA”. See Table 10 on
page 15 for more information.
The SMSA converters are switching regulators that use a flyback
converter design with a constant switching frequency of 500 kHz.
They are regulated, isolated units using a pulse width modulated
topology. Isolation between input and output circuits is provided
with a transformer in the forward power loop 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.
description
On dual output models negative output regulation is maintained
by tightly coupled magnetics.
Predictable current limit is accomplished by direct monitoring
of the output load current, which results in a constant current
output above the overload point. Internal input and output filters
eliminate the need for external capacitors.
W
iDe
v
oltage
r
ange
S
creening
The SMSA converters are designed to provide full power
operation over the full 16 to 40 volt range. An undervoltage
lockout feature keeps the converter shutdown below
approximately 13 volts to ensure smooth initialization.
D
ynamic
r
eSponSe
The SMSA feed-forward compensation system provides excellent
dynamic response and noise rejection. Audio rejection is typically
50 dB (“Figure 15” on page 11).
i
nhibit
F
unction
c
onverter
D
eSign
SMSA converters provide an inhibit feature that can be used to
disable internal switching and inhibit the unit’s output. Inhibiting in
this manner results in low standby current, and no generation of
switching noise.
The converter is inhibited when an active 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 volts. In the
inhibit mode, a maximum of 4 mA must be sunk from the inhibit
pin at 28 volt input.
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
The information in this document has been cleared by the Department of
Defense (DoD) Office of Security Review (OSR) for public release. OSR case
number 13-S-2440 dated July 30, 2013 and 12-S-2048 dated May 29, 2012.
SMSA Rev AD - 2014.08.26
Page 1 of 15
Crane Aerospace & Electronics Power Solutions
SMSA Single and Dual DC-DC Converters
28 Volt input – 5 Watt
ModeL nuMbering key
Base Model
SMSA
28 05 S / K R
S
tandard
M
icrocircuit
d
rawing
(SMd)
5962R0621001KXC
5962R9309202KXC
5962R9309302KXC
5962R9309402KXC
5962R0052202KXC
5962R9308902KXC
5962R9309002KXC
sMd nuMbers
SMSa S
iMilar
P
art
Number of Outputs
(S = single, D = dual)
Environmental Screening
Voltage In (28V)
Output Voltage
SMSA283R3/KR
SMSA2805S/KR
SMSA2812S/KR
SMSA2815S/KR
SMSA2805D/KR
SMSA2812D/KR
SMSA2815D/KR
Radiation Hardness
Assurance (RHA)
F
igure
6: m
oDel
n
umbering
k
ey
The SMD number shown is for Class K screening
and radiation hardness assurance (RHA) level R.
See the SMD for the numbers for other screening
and radiation levels. For exact specifications for
an SMD product, refer to the SMD drawing. SMDs
can be downloaded from:
http://www.landandmaritime.dla.mil/programs/smcr
t
able
3: SmD n
umber
c
roSS
r
eFerence
o
n
the lineS below
,
enter one Selection froM each category to deterMine the Model nuMber
.
ModeL nuMber options
category
options
FiLL in For ModeL #
base Model and
input Voltage
output Voltage
1
3R3, 05, 5R2, 12, 15
number of
outputs
2
S
D
screening
3
O
H
K
rHa
4
O
P
R
_______
SMSA28
05, 12, 15
_____
SMSA28
__________
/
notes
1. An R indicates a decimal point. 3R3 is 3.3 volts out. The values of 3.3 and 5.2 are only available in single output models.
2. number of Outputs: S is a single output and D is a dual output.
3. Screening: A screening level of O is a space prototype and is only used with RHA O. See Table 9 on page 14 and Table 10 on page 15 for more information.
4. RHA: Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) radiation hardness assurance level of MIL-PRF-38534, which is
defined as “no RHA.” RHA O is only available with screening level O. See Table 10 on page 15 for more information.
t
able
4: m
oDel
n
umber
o
ptionS
www.craneae.com/interpoint
SMSA Rev AD - 2014.08.26
Page 5 of 15
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