Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
28 Volt input – 100 Watt
Features
parallel operation with current share,
up to 3 units (up to 285 watts)
•
Operating temperature -55° to +125°C
•
Qualified to MIL-PRF-38534 Class H and K
•
Input voltage range 19 to 40 VDC
•
Fully isolated, magnetic feedback
•
Fixed high frequency switching
•
Inhibit function
•
Radiation hardness assurance (RHA) to level R 100 kRad(Si)
•
Transient protection 80 V for 50 ms
•
Remote sense / output trim on single output models
•
Synchronization input and output
•
Indefinite short circuit protection
•
High power density with up to 87% efficiency
MODELS
VDC
O
utput
SINGLE
3.3
5
12
15
DUAL
±5
±12
±15
description
The Interpoint™ SMFLHP Series™ 28 volt dc-dc converters
are rated up to 100 watts output power over a -55°C to +125°C
temperature range with a 28 VDC nominal input. On dual output
models, up to 70% of the rated output power can be drawn from
either the positive or negative outputs. Current sharing allows
the units to be paralleled for total power of up to 285 watts. The
welded, hermetically sealed package is only 3.005 x 1.505 x
0.400 inches.
D
eSign
F
eatureS
The SMFLHP Series converters are switching regulators that use
a quasi-square wave, single ended forward converter design with
a constant switching frequency of 600 kHz.
Isolation between input and output circuits is provided with a
transformer in the forward path and wide bandwidth magnetic
coupling in the feedback control loop. The SMFLHP Series
uses a unique dual loop feedback technique that controls output
current with an inner feedback loop and output voltage with a
cascaded voltage mode feedback loop.
The additional secondary current mode feedback loop improves
transient response in a manner similar to primary current mode
control and allows for ease of paralleling.
Tight load regulation is achieved through a wide-bandwidth
magnetic feedback circuit. The output voltage on single SMFLHP
models can be easily trimmed up by adding an external resistor.
See “Figure 2: Sense Connections and Trim Table – Single
Output Models” on page 3 for voltage changes with different
resistor values.
S
creening
SMFLHP converters offer screening options to Space Prototype
(O), Class H, or Class K. Radiation tolerant to Radiation
Hardness Assurance (RHA) levels of “-” (O), “P” or “R”, per
MIL-PRF-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 “Table 9: Element Evaluation” on page 14
and “Table 10: Environmental Screening and RHA Levels” on
page 15 for more information.
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
Rev AA - 2013.08.31
The information in this document is a derivative of documents cleared by the Department
of Defense (DoD) Office of Security Review (OSR) for public release. OSR case numbers
09-S-1007 dated March 13, 2009 and 12-S-2048 dated MAY 29, 2012.
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
28 VoLt inPut – 100 Watt
i
nhibit
The SMFLHP Series converters have two inhibit terminals
(INH1 and INH2) that can be used to disable power conversion,
resulting in a very low quiescent input current. An active low (<0.8
volts) is required between INH1 (pin 4) and Input Common (pin
2) to inhibit the converter. An active low (<0.5 volts) is required
between INH2 (pin 12) and Output Common (pin 8) to inhibit the
converter. The application of intermediate voltages to these pins
(1.5 to 10.5 volts) should be avoided.
converter is designated as a master. The SLAVE pin (pin 11) of
the master is left unconnected and the MSTR/INH2 pin (pin 12)
of the master is connected to the SLAVE pin (pin 11) of the slave
units. The units designated as slaves have the MSTR/INH2 pin
(pin 12) connected to the SNS RTN pin (pin 9) of the master unit.
Figure 1 shows the typical setup for two or three units in parallel.
Note that synchronizing the units together (though shown in the
figure) is not required for current sharing operation. A second
slave unit may be placed in parallel with a master and slave; this
requires the TRI pin (pin 3) of the master unit to be connected to
the SNS RTN pin (pin 9).
When paralleled, up to 95% of the total combined power ratings
of the SMFLHP converters is available at the load. Overload
and short circuit performance are not adversely affected during
parallel operation.
c
urrent
S
haring anD
p
arallel
O
peratiOn
Multiple SMFLHP converters may be used in parallel to drive
a common load. See “Figure 1: Parallel Connections – Single
Output Models” on page 2. Only single output models with
SENSE and SNS RTN can be used in the share mode. In this
mode of operation the load current is shared by two or three
SMFLHP converters. In current sharing mode, one SMFLHP
28V
Inhibit
Sync In
+
–
1
2
3
4
5
6
Positive Input
Input Common
TR1
INH1
Sync Out
Sync In
MSTR/INH2
12
Slave
11
Pos. Sense
Sense Return
Positive Output
10
9
8
7
MASTER
–
+
RL
Output Common
CONNECT TR1 ONLY WHEN 2 SLAVES ARE USED
1
2
3
4
5
6
Positive Input
Input Common
TR1
INH1
Sync Out
Sync In
SLAVE 1
Output Common
8
7
Positive Output
Pos. Sense
10
Sense Return
9
MSTR/INH2
12
Slave
11
1
2
3
4
5
6
Positive Input
Input Common
TR1
INH1
Sync Out
Sync In
SLAVE 2
Output Common
8
7
Positive Output
Pos. Sense
10
Sense Return
9
MSTR/INH2
12
Slave
11
Notes
1. No one converter may carry more than its maximum rated current.
2. Although 95% of the maximum current of paralleled converters is available, individual converter operation, load and layout
may affect the actual current shared. Contact Applications Engineering for more information at powerapps@crane-eg.com.
F
igure
1: p
arallel
c
OnnectiOnS
– S
ingle
O
utput
M
ODelS
Page 2 of 15
Rev AA - 2013.08.31
www.craneae.com/interpoint
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
28 VoLt inPut – 100 Watt
+
–
1
2
3
4
5
6
28V
Inhibit
Sync In
Positive Input
Input Common
TR1
INH1
Sync Out
Sync In
Pos. Sense
10
9
Sense Return
8
Output Common
7
Positive Output
MSTR/INH2
12
Slave
11
–
+
RL
REMOTE SENSE CONNECTION
28V
Inhibit
Sync In
+
–
1
2
3
4
5
6
Positive Input
Input Common
TR1
INH1
Sync Out
Sync In
MSTR/INH2
12
11
Slave
10
Pos. Sense
9
Sense Return
8
Output Common
7
Positive Output
RA
–
+
RL
OUTPUT VOLTAGE ADJUST CONNECTION
V
OUT
INCREASE
VOLTS
0.1
0.2
0.3
0.4
0.5
3.3 V
66
131
196
262
349
R
A
(OHMS)
5V
77
153
230
307
396
12 V
27
55
82
109
139
15 V
21
43
64
86
109
Notes:
1. 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.
2. Do not exceed the maximum rated power.
F
igure
2: S
enSe
c
OnnectiOnS
anD
t
riM
t
able
– S
ingle
O
utput
M
ODelS
www.craneae.com/interpoint
Page 3 of 15
Rev AA - 2013.08.31
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
28 VoLt inPut – 100 Watt
pin out
pin
1
2
3
4
5
6
7
8
9
10
11
12
single output
Positive Input
Input Common
Triple (TR1)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Sense Return
Positive Sense
Slave
Master/Inhibit 2
(MSTR/INH2)
dual output
Positive Input
Input Common
Triple (TR1)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Negative Output
No connection
Slave
Master/Inhibit 2
(MSTR/INH2)
pin
3
4
5
6
9
10
11
12
description
TR1
Inhibit 1 (INH1)
Sync Out
Sync In
Sense Return
Positive Sense
Slave
Master/Inhibit 2
(MSTR/INH2)
pins not in use
action
Leave unconnected
Leave unconnected
Leave unconnected
Connect to Input Common
Connect to appropriate
outputs
Connect to appropriate
outputs
Leave unconnected
Leave unconnected
in
t
able
2: p
inS
n
Ot
u
Se
t
able
1: p
in
O
ut
Angled corner indicates pin one.
1
2
3
4
5
6
12
TOP VIEW
SMFLHP
(Pin side, marked side)
See cases U and V for dimensions.
Case V has the same pin out.
11
10
9
8
7
F
igure
3: p
in
O
ut
www.craneae.com/interpoint
Page 4 of 15
Rev AA - 2013.08.31
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
28 VoLt inPut – 100 Watt
Model nuMbering key
Base Model
Input Voltage
SMFLHP
28 15 D / K
R
sMd nuMbers
S
tandard
M
icrocircuit
d
rawing
(SMd)
5962R0620901KxC
5962R0822301KxC
SMFLHP S
erieS
S
iMiLar
P
art
SMFLHP283R3S/KR
SMFLHP2815D/KR
Output Voltage
Number of Outputs
(S = single, D = dual)
Environmental
Screening
Radiation Hardness
Assurance (RHA)
F
igure
4 M
ODel
n
uMbering
K
ey
The SMD number shown is for Class K screening, non-flanged,
and no Radiation Hardness Assurance (RHA) level. See the
SMD for the numbers for other screening and RHA levels.
For exact specifications for an SMD product, refer to the SMD
drawing. SMDs can be down-loaded from:
http://www.landandmaritime.dla.mil/programs/smcr
t
able
3: SMD n
uMber
c
rOSS
r
eFerence
t
o
category
options
Fill in For
Model #
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
case options
3
(U, leave blank)
V
screening
4
O
H
K
rHa
5
O
P
R
Model nuMber options
base Model and
input Voltage
SMFLHP28
05, 12, 15
SMFLHP28
/
_______
Notes:
1. Output Voltage: An R indicates a decimal point. 3R3 is 3.3 volts out. The value of 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 (case U) leave the case option blank. For case option V, insert the letter V in the case option position.
4. Screening: A screening level of O is a Space Prototype and is only used with RHA O. See “Table 9: Element Evaluation” on page 14 and
“Table 10: Environmental Screening and RHA Levels” on page 15 for more information.
5. 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: Environmental Screening
and RHA Levels” on page 15 for more information.
t
able
4: M
ODel
n
uMber
O
ptiOnS
www.craneae.com/interpoint
Page 5 of 15
Rev AA - 2013.08.31
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