Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
19 TO 40 VOLT INPUT – 100 WATT
FEATURES
• Radiation tolerant space DC-DC converter
- Single event effects (SEE) LET performance to
86 MeV cm
2
/mg
- 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)
- 10 mrad(Si)/sec dose rate (Condition D)
• Parallel up to 3 converters—maximum recommended power
is 70% of the total available power.
• Operating temperature -55°C to +125°C
• Qualified to MIL-PRF-38534 Class H and K
• Input voltage range 19 to 40 volts
• Transient protection up to 80 volts for 50 ms
- Converter will shut down at an input voltage
above approximately 45 volts
• Fully isolated, magnetic feedback
• Fixed high switching frequency
• Remote sense and output trim on single output models
• Primary and secondary inhibit function
• Synchronization input and output
• Indefinite short circuit protection
• High power density with up to 87% typical efficiency
MODELS
O
utput
V
Oltage
(V)
SINGLE
3.3
5
12
15
DUAL
±5
±12
±15
The Interpoint
®
SMFLHP Series™ 28 volt DC-DC converters are
rated up to 100 watts output power in a radiation tolerant design
operating over a -55°C to +125°C temperature range with a 28 volt
nominal input. The low profile SMFLHP converters are manufactured
in our fully certified and qualified MIL-PRF-38534 Class K production
facility and packaged in hermetically sealed steel cases. They are
ideal for use in programs requiring high reliability, small size, and
high levels of radiation hardness assurance. On dual output models,
up to 70% of the rated output power can be drawn from either
the positive or negative outputs. The welded, hermetically sealed
package is only 3.005 x 1.505 x 0.400 inches.
S
creening
SMFLHP 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.
DESCRIPTION
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.
i
nhibit
The SMFLHP Series converters have two inhibit terminals (Inhibit
1 and Inhibit 2) that can be used to disable power conversion,
resulting in a very low quiescent input current. See Table 5 on page
6 for specifications.
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.
S
ync
Converters may be synced to an external clock (525 to 675 kHz)
or to one another by using the sync in or out pins. See Table 5 on
page 6 for specifications.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
16706 13th Avenue West, Lynnwood, WA 98037
+1 425.882.3100 • power@craneae.com
www.craneae.com/interpoint
Page 1 of 15
SMFLHP Rev AF - 2020.06.03
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
19 TO 40 VOLT INPUT – 100 WATT
S
enSe anD
t
rim
Single output models provide sense to maintain voltage at the load.
The converters output voltage can also be trimmed up. See Figure 1.
The units designated as slaves have the Master/Inhibit 2 pin (pin
12) connected to the Sense Return pin (pin 9) of the master unit.
Figure 2 on page 3 shows the typical setup for two or three units
in parallel.
A second slave unit may be placed in parallel with a master and
slave; this requires the Triple pin (pin 3) of the master unit to be
connected to the Sense Return pins (pin 9) Figure 2.
In current sharing mode, the converters function as a current source.
For this reason it is important that their outputs be connected to the
common ground at all times to prevent an excessively high voltage at
their outputs.
c
urrent
S
haring anD
p
arallel
O
peratiOn
For increased power parallel up to 3 converters. The maximum
recommended power is 70% of the total available power. Multiple
SMFLHP converters may be used in parallel to drive a common load.
Only single output models with Sense and Sense Return 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 converter is designated as a
master. The Slave pin (pin 11) of the master is left unconnected and
the Master/Inhibit 2 pin (pin 12) of the master is connected to the
Slave pin (pin 11) of the slave units.
28V
+
–
1
2
3
4
5
6
Positive Input
Input Common
Triple (TRI)
Inhibit 1
Sync Out
Sync In
Master/Inhibit 2
12
Slave
11
Positive Sense
10
9
Sense Return
8
Output Common
7
Positive Output
Inhibit
Sync In
REMOTE SENSE CONNECTION
1
2
3
4
5
6
RL
–
+
28V
+
–
Positive Input
Input Common
Triple (TRI)
Inhibit 1
Sync Out
Sync In
Inhibit
Sync In
Master/Inhibit 2
12
11
Slave
10
Positive Sense
9
Sense Return
8
Output Common
7
Positive Output
RA
OUTPUT VOLTAGE ADJUST CONNECTION
RL
–
+
V
OUT
INCREASE
VOLTS
0.1
0.2
0.3
0.4
0.5
3.3 V
66
131
196
262
349
R
A
(Ω)
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 powerapps@crane-eg.com.
2. Do not exceed the maximum rated power.
F
igure
1
: S
enSe
c
OnnectiOnS anD
t
rim
t
able
– S
ingle
O
utput
m
ODelS
www.craneae.com/interpoint
Page 2 of 15
SMFLHP Rev AF - 2020.06.03
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
19 TO 40 VOLT INPUT – 100 WATT
+
–
1
2
3
4
5
6
28V
Positive Input
Input Common
Triple (TRI)
Inhibit 1
Sync Out
Sync In
Master/Inhibit 2
12
Slave
11
Positive Sense
Sense Return
Output Common
Positive Output
10
9
8
7
Inhibit
Sync In
MASTER
RL
–
+
1
2
3
4
5
6
Positive Input
Input Common
Triple (TRI)
Inhibit 1
Sync Out
Sync In
Master/Inhibit 2
12
Slave
11
Positive Sense
10
Sense Return
9
Output Common
8
7
Positive Output
SLAVE 1
1
2
3
4
5
6
Positive Input
Input Common
Triple (TRI)
Inhibit 1
Sync Out
Sync In
Master/Inhibit 2
12
Slave
11
Positive Sense
10
Sense Return
9
Output Common
8
7
Positive Output
SLAVE 2
CONNECT TRIPLE (TRI) ONLY WHEN 2 SLAVES ARE USED
Notes
1. No one converter may carry more than its maximum rated current.
2. Individual converter operation, load and layout may affect the actual current shared. Contact Applications Engineering for more
information at powerapps@crane-eg.com.
3. When paralleling SMFLHPs, a diode is required at the input of each inhibit pin as SMFLHPs do not have an internal diode on the
inhibit pin.
F
igure
2
: p
arallel
c
OnnectiOnS
– S
ingle
O
utput
m
ODelS
www.craneae.com/interpoint
Page 3 of 15
SMFLHP Rev AF - 2020.06.03
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
19 TO 40 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 (TRI)
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 (TRI)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Negative Output
No connection
Slave
Master/Inhibit 2
(MSTR/INH2)
Triple (TRI)
Inhibit 1 (INH1)
Sync Out
Sync In
Sense Return
Positive Sense
Slave
Master/Inhibit 2
(MSTR/INH2)
PINS NOT IN USE
Leave unconnected
Leave unconnected
Leave unconnected
Connect to Input Common
Connect to appropriate outputs
Connect to appropriate outputs
Leave unconnected
Leave unconnected
t
able
2:
p
inS
n
Ot in
u
Se
t
able
1:
p
in
O
ut
Angled corner indicates pin one.
1
2
3
4
5
6
12
11
TOP VIEW SMFLHP
(Pin side, marked side)
10
9
8
7
See Figure 17 on page 12 for dimensions.
F
igure
3
: p
in
O
ut
www.craneae.com/interpoint
Page 4 of 15
SMFLHP Rev AF - 2020.06.03
Crane Aerospace & Electronics Power Solutions
SMFLHP Single and Dual DC-DC Converters
19 TO 40 VOLT INPUT – 100 WATT
MODEL NUMBERING KEY
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Environmental
Screening
Radiation Hardness
Assurance (RHA)
F
igure
4
: m
ODel
n
umbering
K
ey
SMD NUMBERS
D / K
R
S
Tandard
m
icrocircuiT
d
rawing
(Smd)
5962R0620901KXC
5962R1221402KXC
5962R0822301KXC
Smfl S
erieS
S
imilar
p
arT
SMFLHP283R3S/KR
SMFLHP2805S/KR
SMFLHP2815D/KR
SMFLHP
28 15
The SMD number shown is for Class K screening, radiation
hardness assurance (RHA) level R. For exact specifications
for an SMD product, refer to the SMD drawing. SMDs can be
downloaded from
https://landandmaritimeapps.dla.mil/programs/smcr/
t
able
3:
SmD n
umber
c
rOSS
r
eFerence
T
o deTermine The model number enTer one opTion from
each caTegory in The form below
.
CATEGORY
Base Model and
Input Voltage
Output Voltage
1
3R3, 05, 12, 15
Number of
Outputs
2
S
D
Screening
3
O
H
K
RHA
4
O
P
L
R
MODEL NUMBER OPTIONS
OPTIONS
FILL IN FOR
MODEL #
5
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. Screening: A screening level of O is a Space Prototype and is only used with RHA O. See Table 9 on page 13 and Table 10 on page 14
for more information.
4. 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.
5. If ordering by model number add a “-Q” to request solder dipped leads (SMFLHP2815D/KR-Q).
t
able
4:
m
ODel
n
umber
O
ptiOnS
www.craneae.com/interpoint
Page 5 of 15
SMFLHP Rev AF - 2020.06.03
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