- Total ionizing dose (TID) guaranteed per MIL-STD-883
method 1019, radiation hardness assurance (RHA)
1
L = 50 krad(Si), R = 100 krad(Si)
- 10 mrad(Si)/sec dose rate (Condition D)
1
- 50 - 300 rad(Si)/sec dose rate (Condition A)
1
•
Operating temperature -55°C to +125°C
•
Input voltage range 35 to 55 volts
•
Fully isolated
•
Screened to MIL-PRF-38534 Class H and K
1
•
Transient protection 80 volts for 50 ms
MODELS
OUTPUT VOLTAgE (V)
Y
AR
SMHF42 Rev AC Preliminary - 2018.03.06
SINgLE
3.3
5
5.2
12
15
DUAL
±5
±7
±12
±15
•
Fixed high frequency switching
•
Inhibit function
•
Synchronization input
•
Undervoltage lockout
•
Indefinite short circuit protection
EL
The Interpoint
®
SMHF42 Series™ of 42 volt DC-DC converters
offers up to 15 watts of power in a radiation tolerant design. The
low profile SMHF42 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. They are targeted for
operation on a 42 volt satellite power bus. The units are capable
of withstanding transients up to 80 volts for up to 50 ms.
DeSCriPtion
SMHF42 converters offer screening to Class H or K and radiation
hardness assurance (RHA) levels L - 50 krad(Si) or R - 100
krad(Si). Single event effects (SEE) LET
1
performance to 86
MeV cm
2
/mg. See Table 11 on page 18 for more information.
The converters are screened to MIL-PRF-38534. Class H, Class
K, RHA L, RHA R, and SEE are pending product validation.
S
creening
PR
c
onverter
D
eSign
The SMHF42 converters are switching regulators that use a
quasi-square wave, single-ended forward converter design with
a constant switching frequency of 500 kHz typical. Isolation
between input and output circuits is provided with a transformer
in the forward path and a temperature compensated opto-coupler
in the feedback control loop. The opto-coupler is radiation
tolerant and is especially selected for space applications.
1. Screened to MIL-PRF-38534. Class H, Class K, RHA L, RHA R, and SEE are pending product validation.
Crane Aerospace & Electronics
Power Solutions - Interpoint Products
10301 Willows Road NE, Redmond, WA 98052
+1 425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
IM
IN
Page 1 of 18
Dual output models maintain cross regulation with tightly
coupled output magnetics. Up to 70% of the total output power
is available from either output, providing the opposite output
is simultaneously carrying 30% of the total output power.
Predictable current limit is accomplished by directly monitoring
the output load current and providing a constant current output
above the overload point.
Feed-forward compensation system provides excellent dynamic
response and audio rejection. Audio rejection is typically 50 dB.
Typical output voltage response for a 50% to 100% step load
transient is as low as 2% with a 100 µs recovery time, typical.
i
nhibit
F
unction
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 the inhibit pin is pulled low. 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.
S
ynchronization
Synchronization allows the user to synchronize the switching
frequency of the converter to the frequency of the system clock.
This allows the user to adjust the nominal 500 kHz operating
frequency to any frequency within the range of 500 kHz to 600
kHz by applying a compatible input of the desired frequency to
pin 5.
Crane Aerospace & Electronics Power Solutions
SMHF42 Single and Dual DC-DC Converters
PreliMinary 35-55 Volt inPut – 15 Watt
S
hort
c
ircuit
P
rotection
Short circuit protection is provided by restricting the output
current to approximately 140% of the full load output current.
The output current is sensed in the secondary stage to provide
highly predictable and accurate current limiting, and to eliminate
foldback characteristics.
If the dual is configured as a positive 30 volt output the negative
output would be used as system ground and the positive output
would be used as the positive 30 volt output.
If the dual is configured as a negative 30 volt output the positive
output would be used as system ground and the negative output
would be used as the negative 30 volt output.
The maximum capacitance when using a span voltage on a dual
is half the value specified for each output.
u
nDervoltage
l
ockout
Undervoltage lockout prevents the converters from operating
below approximately 30 volts input to keep system current levels
smooth, especially during initialization or re-start operations.
S
Pan
v
oltage on
D
ualS
PR
Crane Aerospace & Electronics
Power Solutions - Interpoint Products
10301 Willows Road NE, Redmond, WA 98052
+1 425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
EL
SMHF42 Rev AC Preliminary - 2018.03.06
IM
Page 2 of 18
IN
AR
Dual outputs may be spanned to increase the output voltage.
Our duals can also be configured as a single output where the
positive output is used as one rail and the negative output is used
as the other rail. As an example the positive and negative 15 volt
dual can be configured as a single 30 volt output. This can be
used as a positive 30 volt output or a negative 30 volt output. In
all cases Output Common of the converter is not connected.
Y
Crane Aerospace & Electronics Power Solutions
SMHF42 Single and Dual DC-DC Converters
PreliMinary 35-55 Volt inPut – 15 Watt
Linear
Regulator
Linear
Regulator
Error
Amp
RS
Current
Limit
Positive
Output
Positive
Input
Input
Common
Inhibit
PWM and
FET
Driver
Output
Common
F
igure
1: SMhF42 S
ingle
o
utPut
, b
lock
D
iagraM
EL
PR
Linear
Regulator
IM
Linear
Regulator
IN
AR
RS
RS
Y
Positive
Output
Error
Amp
Current
Limit
Output
Common
Negative
Output
Positive
Input
Input
Common
PWM and
FET
Driver
Inhibit
F
igure
2: SMhF42 D
ual
o
utPut
, b
lock
D
iagraM
www.craneae.com/interpoint
SMHF42 Rev AC Preliminary - 2018.03.06
Page 3 of 18
Crane Aerospace & Electronics Power Solutions
SMHF42 Single and Dual DC-DC Converters
PreliMinary 35-55 Volt inPut – 15 Watt
Pin out
SMD nuMberS
Pin
1
2
3
4
5
6
7
8
Single output
Inhibit
No connection
Dual output
Inhibit
Positive Output
Output Common
Negative Output
Sync
Case ground
Input Common
Positive Input
S
tandard
M
icrocircuit
d
rawing
(SMd)
5962R1722701KXC IN PROCESS
5962R1722702KXC IN PROCESS
5962R1722703KXC IN PROCESS
5962R1722704KXC IN PROCESS
5962R1722705KXC IN PROCESS
5962R1722801KXC IN PROCESS
5962R1722802KXC IN PROCESS
5962R1722803KXC IN PROCESS
5962R1722804KXC IN PROCESS
SMHF42 S
iMilar
P
art
SMHF423R3S/KR
SMHF4205S/KR
SMHF425R2S/KR
SMHF4212S/KR
SMHF4215S/KR
SMHF4205D/KR
SMHF4207D/KR
SMHF4212D/KR
SMHF4215D/KR
Output Common
Positive Output
Sync
Case ground
Input Common
Positive Input
IN
Sync (pin 5)
PR
EL
1
8
Inhibit (pin 1)
IM
2
3
7
PinS not in uSe
Leave unconnected
Connect to Input Common (pin 7)
t
able
3: P
inS
n
ot in
u
Se
Squared corner and dot on top
of case indicate pin one.
4
5
BOTTOM VIEW
F
igure
3: P
in
o
ut
SMHF42 SINGLE AND DUAL
NON-FLANGED OR FLANGED
6
Dotted line outlines flanged package option.
See Figure 20 on page 15 and
Figure 21 on page 16 for dimensions.
www.craneae.com/interpoint
SMHF42 Rev AC Preliminary - 2018.03.06
Page 4 of 18
AR
Y
t
able
1: P
in
o
ut
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 assur-
ance (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 down-
loaded from http://www.landandmaritime.dla.mil/programs/
smcr/
t
able
2: SMD n
uMber
c
roSS
r
eFerence
Crane Aerospace & Electronics Power Solutions
SMHF42 Single and Dual DC-DC Converters
PreliMinary 35-55 Volt inPut – 15 Watt
MoDel nuMbering key
Base Model
Input Voltage
SMHF
42 05 S F / K
1
R
1
Output Voltage
Number of Outputs
(S = single, D = dual)
Case Option
(Non-flanged case has no designator
in this position)
Environmental Screening
Radiation Hardness
Assurance (RHA)
1. Screened to MIL-PRF-38534. Class H, Class K, RHA L, RHA R, and SEE are
pending product validation.
t
o deterMine tHe Model nuMber enter one oPtion FroM eacH category in tHe ForM below
.
MoDel nuMber oPtionS
1
number of
outputs
3
S
D
EL
output Voltage
2
IM
IN
Case option
4
(non-flanged, leave blank)
F (flanged)
Screening
5
O
H
K
AR
F
igure
4: M
oDel
n
uMbering
k
ey
Y
rHa
6
O
L
R
Category
oPtionS
Fill in For
MoDel #
base Model and
input Voltage
3R3, 05, 5R2, 12, 15
05, 07, 12, 15
PR
SMHF42
SMHF42
__________
Notes
1. See Figure 4 above for an example of a model number.
2. Output Voltage: 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.
3. Number of Outputs: S is a single output and D is a dual output
4. Case Options: For the standard case (Figure 20 on page 15) leave the Case Option blank. For the flanged case option (Figure 21 on page 16), insert the letter F
in the Case Option position.
5. Screening: Screened to MIL-PRF-38534. Class H and K are pending product validation. A screening level of O is a space prototype and is only available with RHA O.
See Table 10 on page 17 and Table 11 on page 18 for more information.
6. RHA: Screened to MIL-PRF-38534. RHA L, RHA R and SEE are pending product validation. 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
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