the SFMC-461 and SFCS28-461), which will result in compliance.
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 approxi-
mately 125% of the maximum rated output current.
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. The SMTR Triple Series DC/DC converter’s
design includes individual regulators on the auxiliary outputs
which provide for no cross regulation error when a minimum
300 mA load is maintained on the main (+5) output.
Crane Aerospace & Electronics
Electronics group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
Synchronizing the converter with the system clock allows the
designer to confine switching noise to clock transitions, mini-
mizing 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.
Rev F - 20090324 - Pending Revision F Release
Cleared by U.S. DoD OSR for Public Release
OSR case number 09S-0995, dated March 13, 2009.
Page 1 of 21
Crane Aerospace & Electronics Power Solutions
SMTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT – PENDINg REVISION F RElEaSE
W
iDe
v
oltage
r
ange
SMTR converters are designed to provide full power operation
over a full 16 to 40 VDC voltage range. Operation below 16 volts,
including MIL-STD-704D emergency power conditions is possible
with derated power.
i
nhibit
F
unction
i
mproveD
D
ynamic
r
eSponSe
The SMTR Series feed-forward compensation system provides
excellent dynamic response and noise rejection. Audio rejection
is typically 50 dB (for Triple output models). The min. to max.
step line transient response is typically less than 4%.
SMTR 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 an active
low (≤0.8V) 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
VDC. In the inhibit mode, a maximum of 8 mA must be sunk from
the inhibit pin.
TRIM aND REMOTE SENSE (aVaIlablE ON SINglE OuTPuT MODElS ONly)
SMTR SINGLE OUTPUT CONVERTER
1
+VIN
OUTPUT
COMMON
SENSE
RETURN
SENSE
10
INPUT
COMMON
POSITIVE
OUTPUT
4
1
3
6
1
RT
5
10
RL
SENSE
INPUT
COMMON
POSITIVE
OUTPUT
SMTR SINGLE OUTPUT CONVERTER
1
+VIN
OUTPUT
COMMON
SENSE
RETURN
4
2
3
6
2
RL
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
F
igure
2: r
emOte
S
enSe
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
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 posi-
tive 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.
www.interpoint.com
Page 2 of 21
Rev F - 20090324 - Pending Revision F Release
Crane Aerospace & Electronics Power Solutions
SMTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT – PENDINg REVISION F RElEaSE
OPERaTINg CONDITIONS aND ChaRaCTERISTICS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for 50 msec transient
audio Rejection
• 40 dB typ (50 dB typ, triple output)
Output Power
• Up to 30 watts depending on model
Conversion Frequency
• Free run 550 min, 600 typ, 650 max kHz
• External sync 500 to 675 kHz
lead Soldering Temperature (10 sec per pin)
• 300°C
Storage Temperature Range (Case)
• -65°C to +135°C
Case Operating Temperature (Tc)
• -55°C to +125°C full power
• -55°C to +135°C absolute
SyNC aND INhIbIT
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
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
• 125% of full load typical
Sync
• Input frequency 500 to 675 kHz
• Duty cycle 40% min, 60% max
• Active low 0.8 V max
• Active high 4.5 V min, 5 V max
• Referenced to input common
• If not used, connect to input common
Inhibit
• Active low (output disabled)
‣
oltage ≤0.8 V
V
‣
Inhibit pin source current 8.0 mA max
‣
Referenced to input common
• Active high (output enabled)
‣
Open collector or unconnected
‣
If not used, leave unconnected
‣
Inhibit pin voltage, 9 to 11 V
Isolation
• 100 megohm minimum at 500 VDC
• Any pin to case, except case pin
MEChaNICal aND ENVIRONMENTal
Size (maximum)
• Single and dual output
‣
non-flanged: 2.125 x 1.115 x 0.400 inches
(53.98 x 28.58 x 10.16 mm) See case H2 for dimensions.
‣
Flanged: 2.910 x 1.115 x 0.400 inches
(73.79 x 28.58 x 10.16 mm) See case K3 for dimensions.
• Triple output
‣
non-flanged: 1.950 x 1.350 x 0.405 inches
(49.53 x 34.29 x 10.29 mm) See case F1 for dimensions.
‣
Flanged: 2.720 x 1.350 x 0.405 inches
(69.09 x 34.29 x 10.29 mm) See case J1 for dimensions.
Screening
Space Prototype (O), Class H, or Class K are 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)
Radiation hardness Assurance level of MIL-PRF- 38534, which
is defined as “no RHA”.
See “Class H and K, MIL-PRF-38534 Screening” tables for more
information, page 21. Available configurations are: OO, HP, KP,
HR, and KR
Weight (maximum)
• Single and dual non-flanged 50 grams, flanged 52 grams
• Triple non-flanged 58 grams, flanged 62 grams
www.interpoint.com
Page 3 of 21
Rev F - 20090324 - Pending Revision F Release
Crane Aerospace & Electronics Power Solutions
SMTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT – PENDINg REVISION F RElEaSE
PIN OuT
Pin
1
2
3
4
5
6
7
8
9
Positive Input
Inhibit
Single Output
Positive Input
Inhibit
Positive Output
Dual Output
Triple Output
Positive Input
Sense Return
Main (+5) Output
Output Common
neg. Aux. Output
Pos. Aux. Output
Case ground
Case ground
Inhibit
Sync
Output Common
Positive Output
Positive Sense
Case ground
Case ground
Sync
Input Common
Output Common
negative Output
Case ground
Case ground
Case ground
Sync
Input Common
10
Input Common
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.
Dotted line outlines flanged package option.
F
igure
3: p
in
O
ut
S
ingle
O
utput
m
ODelS
See cases H2 and K3 for dimensions.
F
igure
4: p
in
O
ut
D
ual
O
utput
m
ODelS
See cases H2 and K3 for dimensions.
Squared corner and dot on top
of package indicate pin one.
1
2
3
4
5
BOTTOM VIEW
SMTR TRIPLE
FLANGED AND NON-FLANGED
10
9
8
7
6
Dotted line outlines flanged package option.
See cases F1 and J1 for dimensions.
F
igure
5: p
in
O
ut
Smtr t
riple
Inhibit
Sync In
Leave unconnected
PINS NOT IN uSE
Sense lines
www.interpoint.com
Connect to Input Common
Must be connected to appropriate outputs
Page 4 of 21
Rev F - 20090324 - Pending Revision F Release
Crane Aerospace & Electronics Power Solutions
SMTR Single, Dual and Triple DC/DC Converters
28 VOlT INPuT – 30 WaTT – PENDINg REVISION F RElEaSE
MODEl NuMbERINg kEy
Base Model
Input Voltage
SMTR
28 512 T
F / K R
In PROCESS
In PROCESS
5962R0150102KXC
5962R9306802KXC
5962R9306902KXC
5962R9307002KXC
5962R9320502KXC
5962R9307102KXC
5962R9307202KXC
In PROCESS
5962R9307402KXC
S
tanDarD
m
iCrOCirCuit
D
rawing
(SmD)
SMD NuMbERS
Smtr S
imilar
p
art
SMTR281R5S/KR
SMTR282R5S/KR
SMTR283R3S/KR
SMTR2805S/KR
SMTR2812S/KR
SMTR2815S/KR
SMTR2805D/KR
SMTR2812D/KR
SMTR2815D/KR
SMTR28512T/KR
SMTR28515T/KR
Output Voltage
(Main and aux. Vout for triple models)
Number of Outputs
(S=single, D=dual, T=triple)
Case Option
("F" indicates flanged option, non-flanged
case has no designator in this position)
Screening
Radiation Hardness
Assurance (RHA)
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. Call your Interpoint representative for status on
the SMTR SMD releases which are “in process.” SMDs can be
downloaded from:
http://www.dscc.dla.mil/programs/smcr
e
nter
SMTR28
BASE MODEL
V
OUT
VALUE
1
1R5, 2R5, 3R3, 05, 12, 15
05, 12, 15
512, 515
MODEl SElECTION
One
S
eleCtiOn
FrOm eaCh CategOry
/
nUMBER OF
OUTPUTS
2
S
D
T
CASE OPTIOn
3
(BLAnK FOR nOn-FLAngED)
F
(FLAngED)
SCREEnIng
4
O
h
k
RHA
5
O
P
R
notes:
1. VOUT Value: An R indicates a decimal point. 1R5 is 1.5 volts out. The values os 1R5, 2R5, and 3R3 are only available in single output models. The 512 and 515
triple output converters are +5 volt main and ±12 or ±15 volt auxiliaries.
2. S is a single output, D is a dual output, and T is a triple output
3. The case option is left blank for the standard, non-flanged, case. For the flanged case, use an F in the case option.
4. A screening level of O is a Space Prototype and is only used with RHA O.
5. 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 page 21 for more information.
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