- Total ionizing dose (TID) guaranteed per MIL-STD-883
method 1019, radiation hardness assurance (RHA)
P = 30 krad(Si), L = 50 krad(Si), R = 100 krad(Si)
- 50 - 300 rad(Si)/sec dose rate (Condition A)
•
Operating temperature -55° to +125°C
•
Input voltage range 16 to 40 volts
•
Fully isolated, magnetic feedback
- 10 mrad(Si)/sec dose rate (Condition D)
- Single event effects (SEE) LET performance to
86 MeV cm
2
/mg
•
Qualified to MIL-PRF-38534 Class H and K
•
Transient protection 50 volts for 50 ms
o
utput
v
oltage
(v)
MODELS
SINGLE
3.3
5
12
15
DUAL
±5
±12
±15
•
Fixed high frequency switching, 600 kHz typical
•
Inhibit and synchronization functions
•
Typical efficiency up to 83%
•
Trim function or remote sense on single output models
•
Indefinite short circuit protection
The Interpoint
®
SMTR Series™ of 28 volt dc-dc converters offers
up to 30 watts of output power from single or dual configurations.
They operate over the full military temperature range of -55°C
to +125°C with up to 84% efficiency. SMTR converters are
packaged in hermetically sealed metal enclosures, making them
ideal for use in military, aerospace and other high reliability
applications.
DESCRIPTION
S
creening
461C’s CE03. For the lowest noise performance, connection
of the case to input common is recommended. The connection
can be hard-wired or ac coupled with a small ceramic bypass
capacitor. 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 140% of the maximum rated
output current.
SMTR converters offer screening options to space prototype (O),
Class H or K and radiation hardness assurance (RHA) levels
P - 30 krad(Si), L - 50 krad(Si) or R - 100 krad(Si). Single event
effects (SEE) LET performance to 86 MeV cm
2
/mg. See Table 9
on page 13 and Table 10 on page 14 for more information.
S
ynchronization
c
onverter
D
eSign
The SMTR 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 by using a 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.
SMTR converters have an internal input filter that helps reduce
the need for external components in normal operation. Use our
SFMC EMI input filter to meet the requirements of MIL-STD-
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
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 an active high
at any duty cycle between 40% and 60%. The sync pin should be
connected to input common pin when not in use.
W
iDe
v
oltage
r
ange
SMTR converters are designed to provide full power operation
over the input voltage range of 16 to 40 volts. Operation below
16 volts, including MIL-STD-704D emergency power conditions is
possible with derated power. Refer to the low line dropout graph,
Figure 22 on page 10, for details.
SMTR Rev AC - 2015.10.14
Page 1 of 14
Crane Aerospace & Electronics Power Solutions
SMTR Single and Dual DC-DC Converters
28 Volt input – 30 Watt
i
mproveD
D
ynamic
r
eSponSe
The SMTR Series feed-forward compensation system provides
excellent dynamic response and noise rejection. Audio rejection
is typically 40 dB. The min. to max. step line transient response
is typically less than 4%.
i
nhibit
F
unction
SMTR converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output voltage and very
low quiescent input current. The converter is inhibited when the
inhibit pin is pulled below 0.8 V and enabled when its inhibit pin
is left floating. An external inhibit interface should be capable of
pulling the converter’s inhibit pin below 0.8 V while sinking the
maximum inhibit current and also allowing the inhibit pin to float
high to enable the converter. A voltage should not be applied to
the inhibit pin. The open circuit voltage present on the inhibit pin
is 9 to 11 V.
TRIM AND REMOTE SENSE (AVAILABLE ON SINGLE OUTPUT MODELS ONLy)
SMTR SINGLE OUTPUT CONVERTER
1
Positive
Input
Output
Common
Sense
Return
Positive
Sense
10
Input
Common
Positive
Output
4
1
3
6
1
RT
RL
SMTR SINGLE OUTPUT CONVERTER
1
Positive
Input
Output
Common
Sense
Return
Positive
Sense
10
Input
Common
Positive
Output
4
2
RL
2
3
6
5
5
EXTERNAL TRIM CONNECTION
1 Make connections at converter.
REMOTE SENSE CONNECTION
2 Make connections at load.
F
igure
1: t
rim
c
onnection 1, 2, 3, 4
F
igure
2: r
emote
S
enSe 2, 3, 4
Trim Formulas Vout = desired output voltage;
R
T
= trim resistor
3.3 V:
5 V:
12 V:
15 V:
R
T
= 1300 * Vout
1.2475
R
T
= 1300 * Vout
1.2475
R
T
= 1300 * Vout
1.2475
R
T
= 1300 * Vout
1.2475
– 4304
– 6512
– 15631
– 19498
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. Do not exceed maximum power.
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.
4. When using remote sense for voltage compensation or when using
remote sense for trim, the output will drift over temperature. Contact
Applications Engineering for more information at powerapps@
crane-eg.com
www.craneae.com/interpoint
SMTR Rev AC - 2015.10.14
Page 2 of 14
Crane Aerospace & Electronics Power Solutions
SMTR Single and Dual DC-DC Converters
28 Volt input – 30 Watt
PIN OUT
Pin
1
2
3
4
5
6
7
8
9
10
Single Output
Positive Input
Inhibit
Sense Return
Dual Output
Positive Input
Inhibit
Positive Output
Output Common
Negative Output
Case Ground
Case Ground
Case Ground
Sync
Input Common
Output Common
Positive Output
Positive Sense
Case Ground
Case Ground
Sync
Input Common
t
able
1: p
in
o
ut
Inhibit
Sync In
PINS NOT IN USE
Leave unconnected
Connect to Input Common
Must be connected to
appropriate outputs
Sense Lines
t
able
2: p
inS not in
u
Se
Dot on top of cover indicates pin one.
Dot on top of cover indicates pin one.
1
2
3
4
5
10
BOTTOM VIEW
SMTR SINGLE
FLANGED AND NON-FLANGED
9
8
7
1
2
3
4
5
6
BOTTOM VIEW
SMTR DUAL
FLANGED AND NON-FLANGED
10
9
8
7
6
Dotted line outlines flanged package option.
For dimensions see Figure 23 on page 11
and Figure 24 on page 12.
Dotted line outlines flanged package option.
For dimensions see Figure 23 on page 11
and Figure 24 on page 12.
F
igure
3: p
in
o
ut
Smtr S
ingle
o
utput
m
oDelS
F
igure
4: p
in
o
ut
Smtr D
ual
o
utput
m
oDelS
www.craneae.com/interpoint
SMTR Rev AC - 2015.10.14
Page 3 of 14
Crane Aerospace & Electronics Power Solutions
SMTR Single and Dual DC-DC Converters
28 Volt input – 30 Watt
MODEl NUMbERINg kEy
Base Model
Input Voltage
SMTR
28 05
D
F / K R
S
tandard
M
icrocircuit
d
rawing
(SMd)
5962R0150102KXC
5962R9306802KXC
5962R9306902KXC
5962R9307002KXC
5962R9320502KXC
5962R9307102KXC
5962R9307202KXC
SMD NUMbERS
SMtr S
iMilar
P
art
SMTR283R3S/KR
SMTR2805S/KR
SMTR2812S/KR
SMTR2815S/KR
SMTR2805D/KR
SMTR2812D/KR
SMTR2815D/KR
Number of Outputs
(S=single, D=dual)
Output Voltage
Case Option
("F" indicates flanged option, non-flanged
case has no designator in this position)
Screening
Radiation Hardness
Assurance (RHA)
F
igure
5: m
oDel
n
umbering
K
ey
To indicate the flanged case option change the “X” to “Z” In the
SMD number. The SMD number shown is for Class K screening,
non-flanged, 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
umberS
t
o
CATEgORy
base Model and
Input Voltage
deterMine the Model nuMber enter one oPtion froM
each category in the forM below
.
Output Voltage
1
3R3, 05, 12, 15
Number of
Outputs
2
S
D
MODEl NUMbER OPTIONS
Case Options
3
Screening
4
O
H
K
RHA
5
O
P
L
R
(non-flanged, leave blank)
F (flanged)
OPTIONS
FIll IN FOR
MODEl #
SMTR
05, 12, 15
__________
SMTR
__________
_______
/
_______
Notes
1. Output Voltage: An R indicates a decimal point. 3R3 is 3.3 volts out. The 3R3 is only available in single output models.
2. Number of Outputs: S is a single output and D is a dual output
3. Case Options: For the standard case (Figure 23 on page 11) leave the case option blank. For the flanged case option (Figure 24 on page 12), insert the
letter F in the Case Option position.
4. Screening: A screening level of O is a Space Prototype and is only available with RHA O. See Table 9 on page 13 and Table 10 on page 14 for more
information.
5. RHA: 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.”
RHA O is only available with Screening level O. See Table 10 on page 14 for more information.
t
able
4: m
oDel
n
umber
o
ptionS
www.craneae.com/interpoint
SMTR Rev AC - 2015.10.14
Page 4 of 14
Crane Aerospace & Electronics Power Solutions
SMTR Single and Dual DC-DC Converters
28 Volt input – 30 Watt
t
able
5: o
perating
c
onDitionS
, a
ll
m
oDelS
, 25°c
caSe
, 28 v
in
, 100%
loaD
,
unleSS otherWiSe SpeciFieD
.
ALL MODELS
PARAMETER
LEAD SOLDERING TEMPERATURE
1
STORAGE TEMPERATURE
1
CASE OPERATING
TEMPERATURE
DERATING OUTPUT POWER/CURRENT
1
ESD RATING
1
MIL-PRF-38534, 3.9.5.8.2
ISOLATION: INPUT TO OUTPUT OR ANy
PIN TO CASE EXCEPT CASE PIN
INPUT TO OUTPUT CAPACITANCE
1
CURRENT LIMIT
1, 2
AUDIO REJECTION
1
CONVERSION FREQUENCy
SyNCHRONIZATION
Sync is floating and isolated
FREE RUN -55° TO +125°C
INPUT FREQUENCy
DUTy CyCLE
1
ACTIVE LOW
ACTIVE HIGH
1
REFERENCED TO
IF NOT USED
INHIBIT ACTIVE LOW (OUTPUT DISABLED)
Do not apply a voltage to the inhibit pin.
3
INHIBIT ACTIVE HIGH (OUTPUT ENABLED)
Do not apply a voltage to the inhibit pin.
3
INHIBIT PIN PULLED LOW
INHIBIT PIN SOURCE CURRENT
1
REFERENCED TO
INHIBIT PIN CONDITION
OPEN PIN VOLTAGE
1
9
—
—
% OF FULL LOAD
FULL POWER
ABSOLUTE
1
LINEARLy
MIL-STD-883 METHOD 3015
CLASS 2
@ 500 VDC AT 25°C
100
—
—
—
550
500
40
—
4.5
CONDITIONS
10 SECONDS MAX.
MIN
—
-65
-55
-55
TyP
—
—
—
—
MAX
300
+150
+125
+135
UNITS
°C
°C
°C
From 100% at 125°C to 0% at 135°C
2000 - 3999
—
50
140
40
600
—
—
—
—
—
—
—
—
650
675
60
0.8
5
V
Megohms
pF
%
dB
kHz
kHz
%
V
INPUT COMMON
CONNECT TO INPUT COMMON
—
—
0.8
8
V
mA
INPUT COMMON
OPEN COLLECTOR OR UNCONNECTED
—
11
V
For mean time between failures (MTBF) contact Applications Engineering
powerapps@crane-eg.com +1 425-882-3100 option 7
Notes
1. Guaranteed by characterization test and/or analysis. Not a production test.
2. Dual outputs: The over-current limit will trigger when the sum of the currents from both outputs reaches 140% (typical value) of the maximum
rated “total” current of both outputs.
3. An external inhibit interface should be used to pull the inhibit low or leave it floating. The inhibit pin can be left unconnected if not used.
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