DESCRIPTION
The Interpoint™ SMHF Series™ of 28 V dc-dc converters offers
a wide input voltage range of 16 to 45 volts and up to 15 watts of
output power. The units are capable of withstanding short term
transients up to 50 volts. The package is a hermetically sealed,
projection-welded metal case. Flanged and non-flanged models
are available.
The SMHF converters are switching regulators that use a quasi-
square wave, single-ended forward converter design with a
constant switching frequency of 550 kHz. 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.
On dual output models, cross regulation is maintained by
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.
The small size, high power density SMHF Series low profile
package provides up to 30 watts per cubic inch.
The SMHF converter’s feed-forward compensation system
provides excellent dynamic response and noise rejection. Audio
rejection is typically 50 dB. Typical output voltage response for a
50% to 100% step load transient is as low as 1.3% with a 150 µs
recovery time, typical. Input ripple current is typically 45 mA p-p
with output ripple voltage typically 15 mV p-p.
SMHF 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 the
inhibit pin is pulled low (≤0.8 V– output disabled). 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 7.5 to 12 VDC. In the inhibit mode, a maximum of 5 mA
must be sunk from the inhibit pin at 28 VDC input.
The SMHF Series’ synchronization feature allows the user to
match the switching frequency of the converter to the frequency
of the system clock. This allows the user to adjust the nominal
550 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. The initial transition on the sync pin should be
a negative transition (i.e. from high state to low state).
SMHF Series converters provide short circuit protection 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.
Undervoltage lockout prevents the units from operating below
approximately 14 VDC input voltage to keep system current
levels smooth, especially during initialization or re-start
operations.
FEATURES
Small footprint 1.65 in2 (10.6 cm2)
• Operating temperature -55° to +125°C
• Qualified to MIL-PRF-38534 Class H and K
• Radiation hardness assurance (RHA) to level R 100 krad(Si)
• Input voltage range 16 to 45 VDC
• Transient protection 50 V for 50 ms
• Fully isolated
• Fixed high frequency switching
• Inhibit function
• Synchronization input
• Indefinite short circuit protection
• Undervoltage lockout
The information in this document has been cleared by the Department of Defense (DoD)
Office of Security Review (OSR) for public release. OSR case number 12-S-2814 dated
August 28, 2012.
MODELS
VDC OUTPUT
SINGLE DUAL
2.5 ±5
3.3 ±12
5 ±15
12
15
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC-DC Converters
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
Page 1 of 16
16-45 VOLT INPUT – 15 WATT
SMHF Rev AC - 2013.01.31
PWM
Controller
ID
IC
Limit
Regulator
Ref.
Output
Common
Positive
Output
Positive
Input
Inhibit
Input
Common
5 µH
2 µF
FET
Driver
Figure 1: SMHF Single Output, BlOck DiagraM
PWM
Controller
ID
IC
Limit Ref.
Output
Common
Positive
Output
Negative
Output
Positive
Input
Inhibit
Input
Common
5 µH
2 µF
FET
Driver
RS
RS
L2B
L2A
Regulator
Figure 2: SMHF Dual Output, BlOck DiagraM
BlOck DiagraMS
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SMHF Single and Dual DC-DC Converters
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SMHF Rev AC - 2013.01.31
Figure 3: pin Out
BOTTOM VIEW
SMHF SINGLE AND DUAL
NON-FLANGED OR FLANGED
Dot on top of cover
indicates pin one.
Dotted line outlines flanged package option.
1 2345
8 7 6
See cases E1 and G1 for dimensions.
PIN OUT
Pin Single Output Dual Output
1 Inhibit Inhibit
2No connection Positive Output
3Output Common Output Common
4Positive Output Negative Output
5 Sync Sync
6Case Ground Case Ground
7Input Common Input Common
8Positive Input Positive Input
PINS NOT IN USE
Inhibit (pin 1) Leave unconnected
Sync (pin 5) Connect to Input Common (pin 7)
taBle 1: pin Out
taBle 2: pinS nOt in uSe
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SMHF Single and Dual DC-DC Converters
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MODEL NUMBERING KEY
SMHF 28 05 S F / K R
Base Model
Input Voltage
Output Voltage
Environmental Screening
Number of Outputs
(S = single, D = dual)
Radiation Hardness
Assurance (RHA)
Case Option
(Non-flanged case has no designator
in this position)
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 speci-
fications for an SMD product, refer to the SMD drawing.
SMDs can be downloaded from:
http://www.landandmaritime.dla.mil/Programs/Smcr/
SMD NUMBERS
Standard Microcircuit
drawing (SMd)
SMHF SiMilar Part
5962R0251002KXC SMHF283R3S/KR
5962R9213902KXC SMHF2805S/KR
5962R9166402KXC SMHF2812S/KR
5962R9160102KXC SMHF2815S/KR
5962R9555902KXC SMHF2805D/KR
5962R9214402KXC SMHF2812D/KR
5962R9161402KXC SMHF2815D/KR
MODEL NUMBER OPTIONS 1
to deterMine tHe Model nuMber enter one oPtion FroM eacH category in tHe ForM below.
CATEGORY Base Model and
Input Voltage
Output Voltage 2Number of
Outputs 3
Case Option 4Screening 5RHA 6
OPTIONS SMHF28
2R5, 3R3, 05, 12, 15 S(non-flanged, leave blank) O O
05, 12, 15 DF (flanged) H P
K R
FILL IN FOR
MODEL # SMHF28
__________
/ _______
Notes:
1. See Model Numbering Key above for an example of a model number.
2. Output Voltage: An R indicates a decimal point. 2R5 is 2.5 volts out. The value of 2R5 and 3R3 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 (case E1 on page 12) leave the case option blank. For the flanged case option (case G1 on page 13), insert the letter F in the
Case Option position.
5. Screening: A screening level of O is a Space Prototype and is only available with RHA O. See “Table 9: Element Evaluation–DC-DC Converters Prototype, Class H
and Class K” on page 15 and “Table 10: Environmental Screening and RHA–DC-DC Converters Prototype, Class H and Class K, RHA P or R” on page 16 for
more information.
6. 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–DC-DC Converters Prototype, Class H and
Class K, RHA P or R” on page 16 for more information.
taBle 3: SMD nuMBer crOSS reFerence
taBle 4: MODel nuMBer OptiOnS
Figure 4: MODel nuMBering key
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC-DC Converters
Page 4 of 16
16-45 VOLT INPUT – 15 WATT
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SMHF Rev AC - 2013.01.31
ALL MODELS
PARAMETER CONDITIONS MIN TYP MAX UNITS
LEAD SOLDERING TEMPERATURE 110 seconds max. — — 300 °C
STORAGE TEMPERATURE 1-65 — +150 °C
CASE OPERATING FULL POWER -55 — +125 °C
TEMPERATURE ABSOLUTE 1 -55 — +135
DERATING OUTPUT POWER/CURRENT 1LINEARLY From 100% at 125°C to 0% at 135°C
ESD RATING 1 1C
MIL-PRF-38534, 3.9.5.8.2
MIL-STD-883
METHOD 3015 1000 — 1999 V
ISOLATION, ANY PIN TO CASE
EXCEPT CASE PIN @ 500 VDC AT 25°C 100 — — Megohms
INPUT TO OUTPUT CAPACITANCE 1— 60 — pF
UNDERVOLTAGE LOCKOUT 1— 14 — VIN
CURRENT LIMIT 1, 2 % OF FULL LOAD — 140 — %
AUDIO REJECTION 1— 50 — dB
CONVERSION FREQUENCY FREE RUN
-55° TO +125°C 480 550 620 kHz
SYNCHRONIZATION INPUT FREQUENCY 500 — 600 kHz
DUTY CYCLE 1 40 — 60 %
ACTIVE LOW — — 0.8 VDC
ACTIVE HIGH 14.5 — 5.0
REFERENCED TO INPUT COMMON
IF NOT USED CONNECT TO INPUT COMMON
INHIBIT ACTIVE LOW (OUTPUT DISABLED)
Do not apply a voltage to the inhibit pin
INHIBIT PIN PULLED
LOW 1— — 0.8 VDC
INHIBIT PIN SOURCE
CURRENT 1— — 5 mA
REFERENCED TO INPUT COMMON
INHIBIT ACTIVE HIGH (OUTPUT ENABLED)
Do not apply a voltage to the inhibit pin INHIBIT PIN CONDITION OPEN COLLECTOR OR
UNCONNECTED
OPEN INHIBIT PIN
VOLTAGE 17.5 — 12 V
Notes:
1. Guaranteed by qualification test and/or analysis. Not an in-line 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.
taBle 5: Operating cOnDitiOnS - all MODelS - teSteD/analyzeD at 28 Vin, raDiatiOn leVel “O”, unleSS OtHerwiSe SpeciFieD
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Notes
1. Guaranteed by qualification test and/or analysis. Not an in-line test.
2. Indefinite short circuit protection not guaranteed above 125°C (case)
3. Recovery time is measured from application of the transient
to the point at which Vout is within regulation.
4. Step transition time >10 µs.
5. Step transition time 100 µs ±20%.
6. Tested on release from inhibit.
SINGLE OUTPUT MODELS SMHF282R5S SMHF283R3S SMHF2805S
UNITS
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX
OUTPUT VOLTAGE 2.425 2.50 2.575 3.20 3.30 3.40 4.85 5.00 5.15 VDC
OUTPUT CURRENT VIN = 16 to 45 VDC — — 2.4 — — 2.4 — — 2.4 A
OUTPUT POWER VIN = 16 to 45 VDC 0 — 6 0 — 8 0 — 12 W
OUTPUT RIPPLE TC = 25°C — 15 50 — 5 30 — 5 30 mV p-p
10 kHz - 2 MHz TC = -55°C TO +125°C — 25 50 — 5 30 — 5 30
LINE REGULATION VIN = 16 TO 45 VDC — 5 50 — 1 10 — 1 10 mV
LOAD REGULATION NO LOAD TO FULL — 28 50 — 20 50 — 20 50 mV
INPUT VOLTAGE
NO LOAD TO FULL
CONTINUOUS 16 28 45 16 28 45 16 28 45 VDC
TRANSIENT 50 ms 10 — 50 0 — 50 0 — 50 V
INPUT CURRENT NO LOAD — 20 40 — 25 50 — 25 40 mA
INHIBITED — 6 10 — 6 10 — 6 10
INPUT RIPPLE CURRENT TC = 25°C –30 50 — 30 80 — 40 80 mA p-p
10 kHz - 10 MHz TC = -55°C TO +125°C — — 50 — — 120 — — 120
EFFICIENCY TC = 25°C 65 67 — 68 73 — 73 75 — %
TC = -55°C TO +125°C 63 — — 65 — — 70 — —
LOAD FAULT 2SHORT CIRCUIT
POWER DISSIPATION — 3 6 — 5 8 — 3.5 8 W
RECOVERY 1, 3 — 7.5 30 — 7.5 30 — 7.5 30 ms
STEP LOAD RESPONSE 50% - 100% - 50%
TRANSIENT 4— 50 200 — 150 400 — 150 400 mV pk
RECOVERY 3— 50 270 — 150 300 — 150 300 µs
STEP LINE RESPONSE 1TRANSIENT 5— 550 800 — 550 800 — 550 800 mV pk
16 - 40 -16 VDC RECOVERY 3— 800 1200 — 200 500 — 200 500 µs
STEP LINE RESPONSE 1TRANSIENT 5— — — — 70 — — 110 — mV pk
22 - 32 -22 VDC RECOVERY 3— — — — 200 — — 180 — µs
STEP LINE RESPONSE 1TRANSIENT 5— — — — 100 — — 160 — mV pk
36 - 45 -36 VDC RECOVERY 3— — — — 250 — — 180 — µs
START-UP 6 DELAY — 10 20 — 10 25 — 10 25 ms
OVERSHOOT 1— — 250 — 15 50 — 15 50 mV pk
CAPACITIVE LOAD TC = 25°C — — — — — 300 — — 300 µF
taBle 6: electrical cHaracteriSticS: -55°c tO +125°c caSe, 28 VDc Vin, 100% lOaD, raDiatiOn leVel “O”, unleSS OtHerwiSe SpeciFieD.
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Notes
1. Guaranteed by qualification test and/or analysis. Not an in-line test.
2. Indefinite short circuit protection not guaranteed above 125°C (case)
3. Recovery time is measured from application of the transient
to the point at which Vout is within regulation.
4. Step transition time >10 µs.
5. Step transition time 100 µs ±20%.
6. Tested on release from inhibit.
SINGLE OUTPUT MODELS SMHF2812S SMHF2815S
UNITS
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX
OUTPUT VOLTAGE 11.76 12.00 12.24 14.70 15.00 15.30 VDC
OUTPUT CURRENT VIN = 16 to 45 VDC — — 1.25 — — 1.00 A
OUTPUT POWER VIN = 16 to 45 VDC 0 — 15 0 — 15 W
OUTPUT RIPPLE TC = 25°C — 15 40 — 10 40 mV p-p
10 kHz - 2 MHz TC = -55°C TO +125°C — 15 40 — 10 40
LINE REGULATION VIN = 16 TO 45 VDC — 5 20 — 8 30 mV
LOAD REGULATION NO LOAD TO FULL — 20 50 — 20 50 mV
INPUT VOLTAGE
NO LOAD TO FULL
CONTINUOUS 16 28 45 16 28 45 VDC
TRANSIENT 50 ms 10 — 50 0 — 50 V
INPUT CURRENT NO LOAD — 25 55 — 25 62 mA
INHIBITED — 5 10 — 5 10
INPUT RIPPLE CURRENT TC = 25°C — 40 80 — 60 80 mA p-p
10 kHz - 10 MHz TC = -55°C TO +125°C — — 120 — — 120
EFFICIENCY TC = 25°C 76 79 — 78 80 — %
TC = -55°C TO +125°C 72 — — 74 — —
LOAD FAULT 2SHORT CIRCUIT
POWER DISSIPATION — 3.5 8 — 3.5 8 W
RECOVERY 1, 3 — 7.5 30 — 7.5 30 ms
STEP LOAD RESPONSE 50% - 100% - 50%
TRANSIENT 4— 150 500 — 200 500 mV pk
RECOVERY 3— 50 300 — 50 300 µs
STEP LINE RESPONSE 1TRANSIENT 5— 550 800 — 550 800 mV pk
16 - 40 -16 VDC RECOVERY 3— 300 700 — 300 700 µs
STEP LINE RESPONSE 1TRANSIENT 5— 250 — — 250 — mV pk
22 - 32 -22 VDC RECOVERY 3— 210 — — 210 — µs
STEP LINE RESPONSE 1TRANSIENT 5— 350 — — 350 — mV pk
36 - 45 -36 VDC RECOVERY 3— 300 — — 300 — µs
START-UP 6 DELAY — 10 25 — 10 25 ms
OVERSHOOT 1— 25 50 — 25 50 mV pk
CAPACITIVE LOAD TC = 25°C — — 100 — — 100 µF
taBle 7: electrical cHaracteriSticS: -55°c tO +125°c caSe, 28 VDc Vin, 100% lOaD, raDiatiOn leVel “O”, unleSS OtHerwiSe SpeciFieD.
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SMHF Single and Dual DC-DC Converters
Page 7 of 16
16-45 VOLT INPUT – 15 WATT
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DUAL OUTPUT MODELS SMHF2805D SMHF2812D SMHF2815D
UNITS
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX
OUTPUT VOLTAGE +VOUT 4.85 5.00 5.15 11.76 12.00 12.24 14.70 15.00 15.30 V
-VOUT 4.82 5.00 5.18 11.70 12.00 12.30 14.63 15.00 15.38
OUTPUT CURRENT 2EACH OUTPUT — ±1.2 1.68 — ±0.625 0.875 — ±0.5 0.7 A
VIN = 16 to 45 VDC TOTAL — — 2.4 — — 1.25 — — 1.0
OUTPUT POWER 2EACH OUTPUT — ±6 8.4 — — 10.5 — — 10.5 W
VIN = 16 to 45 VDC TOTAL — — 12 — — 15 — — 15
OUTPUT RIPPLE TC = 25°C — 30 95 — 30 95 — 30 95 mV p-p
± VOUT, 10 kHz - 2 MHz TC = -55°C TO +125°C — 30 95 — 30 95 — 30 95
LINE REGULATION 3+VOUT — 2 10 — 2 18 — 2 18 mV
VIN = 16 TO 45 VDC -VOUT — 10 100 — 10 100 — 10 100
LOAD REGULATION 3+VOUT — 5 25 — 5 25 — 5 25 mV
NO LOAD TO FULL -VOUT — 80 150 — 60 150 — 40 150
CROSS REGULATION 4EFFECT ON -VOUT — 6 7.5 — 3 6 — 3 6 %
INPUT VOLTAGE NO LOAD TO FULL,
CONTINUOUS 16 28 45 16 28 45 16 28 45 VDC
TRANSIENT 50 ms 1— — 50 — — 50 — — 50 V
INPUT CURRENT NO LOAD — 25 50 — 30 50 — 30 50 mA
INHIBITED — 6 10 — 6 10 — 6 10
INPUT RIPPLE CURRENT TC = 25°C — 40 80 — 40 80 — 60 80 mA p-p
10 kHz - 10 MHz TC = -55°C TO +125°C — 60 120 — 55 120 — 55 120
EFFICIENCY TC = 25°C 75 77 — 76 81 — 76 82 — %
TC = -55°C TO +125°C 72 — — 74 — — 74 — —
LOAD FAULT 5SHORT CIRCUIT
POWER DISSIPATION — 3 6 — 3 6 — 3 6 W
RECOVERY 1, 6 — 6 30 — 6 30 — 6 30 ms
STEP LOAD RESPONSE 7, 8 TRANSIENT — ±200 ±500 — ±300 ±600 — ±300 ±600 mV pk
50% ó 100% Bal Loads RECOVERY 6— 90 400 — 90 400 — 90 400 µs
STEP LINE RESPONSE 1TRANSIENT 9— ±500 ±800 — ±500 ±750 — ±550 ±750 mV pk
± VOUT, 16 - 40 -16 VDC RECOVERY 6— 200 700 — 300 900 — 300 900 µs
STEP LINE RESPONSE 1TRANSIENT 9— ±125 — — ±160 — — ±160 — mV pk
± VOUT, 22 - 32 - 22 VDC RECOVERY 6— 200 — — 160 — — 160 — µs
STEP LINE RESPONSE 1TRANSIENT 9— ±200 — — ±250 — — ±250 — mV pk
± VOUT, 36 - 45 - 36 VDC RECOVERY 6— 160 — — 200 — — 200 — µs
START-UP 10 DELAY — 12 25 — 10 20 — 10 20 ms
OVERSHOOT 10 100 500 0 100 500 0 100 500 mV pk
CAPACITIVE LOAD TC = 25°C — — 47 — — 10 — — 10 µF
Notes: See page 9
taBle 8: electrical cHaracteriSticS: -55°c tO +125°c caSe, 28 VDc Vin, 100% lOaD, raDiatiOn leVel “O”, unleSS OtHerwiSe SpeciFieD.
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual DC-DC Converters
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SMHF Rev AC - 2013.01.31
Notes for SMHF Dual Models:
1. Guaranteed by qualification test and/or analysis. Not an in-line test.
2. 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.
Each output must carry a minimum of 30% of the total output power in order to
maintain regulation on the negative output.
3. Balanced loads.
4. Effect on –Vout for the following conditions, percentages are of total power:
+Po = 50%, –Po = 10%;
+Po = 10%, –Po = 50%
+Po = 70%, –Po = 30%
+Po = 30%, –Po = 70%
All conditions are referenced to balanced loads of 50%/50%.
5. Indefinite short circuit protection not guaranteed above 125°C (case)
6. Recovery time is measured from application of the transient to point at which
Vout is within regulation.
7. Response of either output with the opposite output held at half of the total
output power.
8. Step transition time >10 µs.
9. Step transition time 100 µs ±20%.
10. Tested on release from inhibit.
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Typical performance ploTs:
28 Vin, 25°c Tc, 100% load, radiaTion leVel “0”, free run, unless oTherwise specified.
These are examples for reference only and are not guaranteed specifications.
–1000.1 1 10 100
–90
–80
–70
–60
–50
–40
–20
–10
0
–30
SMHF Series Single Audio Rejection
Audio Rejection (dB)
Frequency (Hz), 28 VIN
MIL-STD-461 C CE03 LIMIT
NARROWBAND
90
70
50
30
10
.015 0.1 110 50
Figure 5
SMHF2805S, unfiltered,
Representative of the SMHF Series of DC-DC Converters
Emission Level (dB µA)
Frequency (MHz), 28 VIN
NARROWBAND
90
70
50
30
10
.015 0.1 110 50
MIL-STD-461 C CE03 LIMIT
Figure 6
SMHF2805S with Interpoint SFMC28-461 EMI Filter,
Representative of the SMHF Series of DC-DC Converters
Emission Level (dB µV)
Frequency (MHz), 28 VIN
Figure 7 Figure 8 Figure 9
100 µs/div
1 μs/div
2 mA/div.
1 μs/div
2 mV/div.
Representative of
SMHF Series Iin Ripple
Representative of
SMHF Series Vout Ripple
2 mA/div
10 mV/div
1 µs/div 1 µs/div
+Vout
-Vout
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Typical performance ploTs:
28 Vin, 25°c Tc, 100% load, radiaTion leVel “0”, free run, unless oTherwise specified.
These are examples for reference only and are not guaranteed specifications.
100 μs/div
16-45 Vin
200 mV/div. 20 V/div.
100 μs/div
45-16 Vin
200 mV/div. 20 V/div.
100 μs/div
50 - 100 -50%
100 mV/div.
SMHF2805S Representative of
Single Output Line Transient
SMHF2805S Representative of
Single Output Line Transient
SMHF2805S Representative of
Single Output Load Transient
SMHF2805S Representative of
Single Output Low Line Dropout vs. Load
200 mV/div
Input Voltage (Volts)
200 mV/div
200 mV/div
20 V/div
20 V/div
100 µs/div 100 µs/div 100 µs/div
Output Power (Watts)
Vin 16 to 45 VDC, full resistive load Vin 45 to 16 VDC, full resistive load 50 - 100 - 50% Load
50 mV Drop
4 ms/div
Full Load
SMHF2805S Turn-On
2 V/div. 20 V/div.
SMHF2805S Representative of
Single Output Turn-On Delay
2 V/div 20 V/div
4 ms/div
Full resistive load
SMHF2805S Efficiency
Efficiency (%)
Output Power (Watts)
16 Vin 28 Vin 45 Vin
35
45
55
65
75
85
1.2 3 6 9 12
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2805S
35
45
55
65
75
85
1.2 3 6 9 12
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2805S
SMHF2812S Efficiency
Efficiency (%)
Output Power (Watts)
16 Vin 28 Vin 45 Vin
35
45
55
65
75
85
1.2 3 6 9 12
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2805S
35
45
55
65
75
85
1.5 3.75 7.5 11.25 15
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2812S
SMHF2815S Efficiency
Efficiency (%)
Output Power (Watts)
16 Vin 28 Vin 45 Vin
35
45
55
65
75
85
1.2 3 6 9 12
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2805S
35
45
55
65
75
85
1.5 3.75 7.5 11.25 15
Effiiciency (%)
Output Power (Watts)
16V 28V 45V
SMHF2815S
10 11 12 13 14 15
14
15
16
SMHF2812S&D
SMHF2815S&D
SMHF2805S&D
13
12
Figure 10
Figure 13 Figure 14
Figure 15 Figure 16 Figure 17
Figure 11 Figure 12
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Typical performance ploTs:
28 Vin, 25°c Tc, 100% load, radiaTion leVel “0”, free run, unless oTherwise specified.
These are examples for reference only and are not guaranteed specifications.
100 μs/div
16-45 Vin
500 mV/div. 20 V/div.
100 μs/div
45-16 Vin
500 mV/div. 20 V/div.
2.5 ms/div
50 - 100 - 50%
200 mV/div.
25 ms/div
Full Load
SMHF2815D Turn-On
5 V/div. 20 V/div.
SMHF2815D Representative of
Dual Output Line Transient
SMHF2815D Representative of
Dual Output Line Transient
SMHF2815D Representative of
Dual Output Load Transient
200 mV/div
200 mV/div
200 mV/div
20 V/div
20 V/div
100 µs/div
+Vout
+Vout
+Vout
+Vout
-Vout
-Vout
-Vout
-Vout
100 µs/div 100 µs/div
Vin 16 to 45 VDC, full resistive load Vin 16 to 45 VDC, full resistive load 50 - 100 - 50% Load
SMHF2815D Representative of
Dual Output Turn-On Delay
|2| V/div 20 V/div
4 ms/div
Full resistive load
SMHF2805D Efficiency
Efficiency (%)
Output Power (Watts)
16 Vin 28 Vin 45 Vin
35
45
55
65
75
85
95
1.2 3 6 9 12
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2805D
SMHF2812D Efficiency
Efficiency (%)
Output Power (Watts)
16 Vin 28 Vin 45 Vin
35
45
55
65
75
85
95
1.5 3.75 7.5 11.25 15
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2812D
35
45
55
65
75
85
95
1.5 3.75 7.5 11.25 15
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2812D
SMHF2815D Efficiency
Efficiency (%)
Output Power (Watts)
16 Vin 28 Vin 45 Vin
35
45
55
65
75
85
1.2 3 6 9 12
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2805S
35
45
55
65
75
85
95
1.5 3.75 7.5 11.25 15
Efficiency (%)
Output Power (Watts)
16V 28V 45V
SMHF2815D
POSITIVE OUTPUT LOAD (% OF TOTAL LOAD)
–VOUT WITH SHIFT IN LOAD BALANCE
CROSS REGULATION
–V
OUT
VOLTAGE CHANGE (%)
–10 1000 20 40 60 80
–5
0
5
10
2812D
2815D
2805D
OUTPUT LOAD (%)
COND. A: 50% LOAD +V; 50% to 10% –V
COND. B: 50% LOAD –V; 50% to 10% +V
SMHF2805D/SMHF2812D/SMHF2815D
CROSS REGULATION
–V
OUT
VOLTAGE CHANGE (%)
–10
0
10
10 20 30 40 50
–8
–6
–4
–2
2
4
6
8
2815D
2812D
2812D
COND B
COND A
2805D
2805D
SMHF Dual Cross Regulation SMHF Dual Cross Regulation
-Vout Voltage Change (%)
-Vout Voltage Change (%)
Positive Output Load (% of Total Load)
Output Load (%)
-Vout with Shift in Load Balance
Condition A: +V 50% Load; -V 50% to 10% Load
Condition B: -V 50% Load; +V 50% to 10% Load
Figure 18 Figure 19 Figure 20
Figure 21 Figure 22 Figure 23
Figure 26 Figure 24 Figure 25
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SMHF Single and Dual DC-DC Converters
Page 12 of 16
16-45 VOLT INPUT – 15 WATT
www.craneae.com/interpoint
SMHF Rev AC - 2013.01.31
0.000
0.205 (5.21)
0.505 (12.83)
0.705 (17.91)
0.905 (22.99)
1.105 (28.07)
0.330 max.
(8.38)
0.000
0.25 (6.35)
0.000
0.160 (4.06)
0.960 (24.38)
1 2345
0.030 dia.
(0.76)
8 7 6
BOTTOM VIEW CASE E1
Projection Weld Squared corner and dot on top
of case indicate pin one.
1.130 max. (28.70)
1.460 max. (37.08)
Weight: 30 grams maximum
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device. Solder pins
individually with heat application not exceeding 300°C for 10 seconds per pin.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins #52 alloy/Gold compression glass seal.
Seal Hole: 0.080 ±0.002 (2.03 ±0.05)
Case E1, Rev E, 2011.10.20
Please refer to the numerical dimensions for accuracy.
Figure 27: caSe e1
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Page 13 of 16
SMHF Single and Dual DC-DC Converters
16-45 VOLT INPUT – 15 WATT
www.craneae.com/interpoint
SMHF Rev AC - 2013.01.31
1.590 (40.39)
2 x Dia 0.128 ±0.002
(3.25 ±0.05)
Flanged cases: Designator "F" required in Case Option position of model number
BOTTOM VIEW CASE G1
0.000
0.205 (5.21)
0.505 (12.83)
0.705 (17.91)
0.905 (22.99)
1.105 (28.07)
1 2345
8 7 6
0.140 (3.56)
0.560
(14.22)
Squared corner and dot on top
of case indicate pin one.
1.130 max. (28.70)
0.030 dia.
(0.76)
0.330 max.
(8.38)
0.000
0.25 (6.35)
Projection Weld
Flange thickness: 0.047 (1.19)
(2.005 max (50.93))
0.960
(24.38)
0.000
0.160
(4.06)
Weight: 30 grams maximum
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device. Solder pins
individually with heat application not exceeding 300°C for 10 seconds per pin.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins #52 alloy/Gold compression glass seal.
Seal Hole: 0.080 ±0.002 (2.03 ±0.05)
Case G1, Rev E, 2011.10.20
Please refer to the numerical dimensions for accuracy.
2 x R 0.130 (3.30)
Figure 28: caSe g1
Crane Aerospace & Electronics Power Solutions
Page 14 of 16
SMHF Single and Dual DC-DC Converters
16-45 VOLT INPUT – 15 WATT
www.craneae.com/interpoint
SMHF Rev AC - 2013.01.31
TABLE 1: ELEMENT EVALUATION–DC-DC CONVERTERS PROTOTYPE, CLASS H AND CLASS K
DC-DC CONVERTERS PROTOTYPE, CLASS H AND CLASS K,
MIL-PRF-38534 ELEMENT EVALUATION
NON-QML
1QML
PROTOTYPE CLASS H CLASS K
COMPONENT-LEVEL TEST PERFORMED
/O /H /K
M/S 2 M/S 2 P 3 M/S 2 P 3
Element Electrical n nnnn
Visual nnnn
Internal Visual n n
Temperature Cycling n n
Constant Acceleration n n
Interim Electrical n
Burn-in n
Post Burn-in Electrical n
Steady State Life n
Voltage Conditioning Aging n
Visual Inspection n
Final Electrical nnnn
Wire Bond Evaluation nnnn
SEM n
Notes:
1. Non-QML products may not meet all of the requirements of MIL-PRF-38534.
2. M/S = Active components (Microcircuit and Semiconductor Die)
3. P = Passive components, Class H and K element evaluation. Not applicable to Space Prototype (“O”) element evaluation.
Definitions:
Element Evaluation: Component testing/screening per MIL-STD-883 as determined by MIL-PRF-38534
SEM: Scanning Electron Microscopy
taBle 9: eleMent eValuatiOn–Dc-Dc cOnVerterS prOtOtype, claSS H anD claSS k
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SMHF Single and Dual DC-DC Converters
Page 15 of 16
16-45 VOLT INPUT – 15 WATT
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SMHF Rev AC - 2013.01.31
Table is for reference only. See individual Series datasheets for specific screening.
TABLE 4: ENVIRONMENTAL SCREENING AND RHA–DC-DC CONVERTERS PROTOTYPE, CLASS H AND CLASS K, RHA P OR R
DC-DC CONVERTERS PROTOTYPE, CLASS H AND CLASS K
MIL-PRF-38534 ENVIRONMENTAL SCREENING AND RHA
1
P OR R
NON-QML
2 QML 3
PROTOTYPE CLASS H CLASS K
TEST PERFORMED
/OO /HP /HR /KP /KR
Non-destruct wire bond pull, Method 2023 n 4n 4n n
Pre-cap Inspection, Method 2017, 2032 n nnnn
Temperature Cycle (10 times)
Method 1010, Cond. C, -65°C to +150°C, ambient n nnnn
Constant Acceleration
Method 2001, 3000 g (Qual 5000 g) n nnnn
PIND, Test Method 2020, Cond. A n 4 n 4n n
Pre burn-in test, Group A, Subgroups 1 and 4 n n 4 n 4n n
Burn-in Method 1015, +125°C case, typical 5
96 hours n
160 hours n n
2 x 160 hours (includes mid-BI test) n n
Final Electrical Test, MIL-PRF-38534, Group A,
Subgroups 1 and 4: +25°C case n
Subgroups 1 through 6, -55°C, +25°C, +125°C case nnnn
Hermeticity Test
Gross Leak, Method 1014 n nnnn
Fine Leak, Method 1014 n nnnn
Radiography, Method 2012 n n
Post Radiography Electrical Test, +25°C case n 4 n 4
Final visual inspection, Method 2009 n nnnn
RHA P: 30 krad(Si) total dose n n
RHA R: 100 krad(Si) total dose n n
SEE LET 40 MeV-cm2/mg nnnn
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. Our Redmond facility has a DLA approved RHA plan for Interpoint power
products. Our SMD products with RHA “P” or “R” code meet DLA requirements.
2. “OO” prototypes are non-QML products and may not meet all of the requirements
of MIL-PRF-38534. “O” in the RHA designator position in Interpoint model
numbers indicates DLA RHA “-” defined as no RHA.
3. All processes are QML qualified and performed by certified operators.
4. Not required by DLA but performed to assure product quality.
5. Burn-in temperature designed to bring the case temperature to +125°C minimum.
Burn-in is a powered test.
taBle 10: enVirOnMental Screening anD rHa–Dc-Dc cOnVerterS prOtOtype, claSS H anD claSS k, rHa p Or r
Crane Aerospace & Electronics Power Solutions
SMHF Single and Dual, SMHF Rev AC - 2013.01.31. This revision supersedes all previous releases. All technical information is believed to be
accurate, but no responsibility is assumed for errors or omissions. Crane Electronics, Inc. reserves the right to make changes in products or
specifications without notice. Interpoint and SMHF Series are trademarks of Crane Electronics, Inc. Copyright © 1999 - 2013 Crane Electronics,
Inc. All rights reserved. www.craneae.com/interpoint
Page 16 of 16
SMHF Single and Dual DC-DC Converters
16-45 VOLT INPUT – 15 WATT