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DC-DC Converters
28 Volt Input
MHE Series
20 Watt
NOT RECOMMENDED FOR NEW DESIGNS
Features
models
Output Voltage
• -55°C to +85°C operation
• 17 to 40 volts input
Single
5
12
15
• 50 volts for 50 ms transient
protection in 28 Vin models
• Fully isolated
• Fixed frequency switching
• Output trim on single output models
• Inhibit function
• Up to 83% efficiency
• Indefinite short circuit protection
Size (max.):
Weight:
Screening:
Dual
±12
±15
Non-flanged
2.110 x 1.120 x 0.495 inches MHE (case H6) (53.59 x 28.45 x 12.57) mm
Flanged
2.910 x 1.115 x 0.495 inches MHE (case K7) (73.91 x 28.45 x 12.57) mm
See cases H6 and K7 for dimensions.
50 grams typical
Standard or ES. See screening table for more information.
description
The Interpoint® MHE Series™ dc-dc converters offer the high efficiencies associated with switching regulators, yet have full isolation
and the excellent regulation typical of linear regulators. No external
components are required for operation. MHE Series converters are
built using thick-film hybrid technology, and are sealed in metal
packages for military, aerospace, and other high-reliability applications. Unscreened models are solder sealed and are guaranteed to
pass a gross leak test (maximum leak rate of 1 x 10-3 atm.-cc/sec).
Environmentally screened models are hermetically sealed and are
screened to “ES” standards.
An inhibit function is provided on MHE Series c­ onverters to allow
power shutdown and startup from a logic input. The unit is inhibited
when the inhibit input pin (pin 2) is connected to the input common
(pin 10). The open circuit voltage of the inhibit pin is 11 to 13 VDC.
During inhibit, the input inhibit pin must sink approximately 1 mA.
In the inhibit mode, converter output drops to less than 1 V and the
input current is typically 8 mA.
The MHE Series converters are pulse-width modulated switching
regulators operating in the forward mode, with a nominal switching
frequency of 125 to 140 kHz. Isolation is achieved through the use
of a transformer in the forward power circuit, and an optocoupler is
used in the feedback/control loop. The full load output power is available over the full input voltage range. Short-term transients of 50
volts will not impair normal operation.
MHE Series converters are rated to operate at full load up to a case
temperature of 85°C, with the output power derated linearly to zero
at 115°C. Because of the unit’s high efficiency, heat sinking requirements are minimized, but due consideration should be given to
removing self-generated heat when operating the device at maximum
ratings. To increase dissipation, heat conducting material (PCB,
copper sheet, heat sink, etc.) should be brought into contact with the
converter’s baseplate.
The efficiency is typically greater than 80% over the entire input
voltage range and from approximately 25% of full load to full load.
This feature makes the MHE Series converters ideal for either battery
or aircraft power applications.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Road NE, Redmond, WA 98052
+1 425-882-3100 • [email protected]
www.craneae.com/interpoint
Automatic current limiting circuitry protects the converter from short
circuits.
When the MHE Series converters are used in a
­ pplications requiring
full power operation for extended periods of time, or in shock and
vibration environments, it is highly recommended that the flangemount option be used. This option provides improved thermal
transfer capabilities as well as a mechanically secure mounting
configuration.
Page ­­­­­­­­­­­­­­­1 of 7
MHE Rev AC - 2016.03.16
DC-DC Converters
absolute maximum ratings
Output Power
•15 to 20 watts depending on model
Lead Soldering Temperature (10 sec per lead)
•300°C
Storage Temperature Range (Case)
•-55°C to +125°C
recommended operating conditions
Input Voltage Range
Continuous
•17 to 40 volts
Transient
•50 volts for 50 msec
Case Operating Temperature (Tc)
•-55°C to +85°C full power
Derating Output Power/Current
•Linearly from 100% at 85°C to 0% at 115° C
•Derate by 33% at 16 volts input
www.craneae.com/interpoint
typical characteristics
Output Voltage Temperature Coefficient
•150 ppm/°C, typical
Input to Output Capacitance
•60 pF, typical
Isolation
•100 megohm minimum at 500 V
Conversion Frequency
•125 kHz, typical
Inhibit Pin Voltage (unit enabled)
•11 to 13 volts
inhibit
Inhibit TTL Open Collector
•Logic low (output disabled)
Logic low voltage ≤0.8 volts
•Referenced to input common
•Logic high (output enabled)
Open collector
Page ­­­­­­­­­­­­­­­2 of 7
MHE Rev AC - 2016.03.16
MHE Series
20 Watt
DC-DC Converters
MHE Series
20 Watt
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
single output models
PARAMETER
mhe2805s
CONDITIONS
output voltage
output current 1
output power 1
tc = -55°C to +85°C
mhe2812s
MIN
MIN
TYP
MAX
4.95
5.00
5.05 11.88
—
—
3.0
—
mhe2815s
TYP
MAX
12.00
12.12
—
1.67
UNITS
MIN
TYP
MAX
14.85
15.00
15.15
V
—
—
1.33
A
tc = -55°C to +85°C
—
—
15
—
—
20
—
—
20
W
0 to 1 MHz
—
35
60 —
60
80
—
30
60
mV p-p
line regulation
vin min to max
—
2
—
3
10 —
3
10
mV
load regulation
no load to full
—
10
20 —
5
15 —
5
15
mV
continuous
17
28
40
17
28
40 17
28
40
transient 50 ms
—
—
50
—
—
50 —
—
50
output ripple
input voltage
no load
—
—
18
—
—
30 —
—
30
mA
—
20
50 —
25
50
—
25
50
mA p-p
78
81
— 79
82
—
80
83
—
%
efficiency
dual output models
PARAMETER
mhe2812d
CONDITIONS
output current 1
output power 1
MIN
TYP
mhe2815D
MAX
MIN
TYP
MAX
±11.88 ±12.00 ±12.12
±14.85 ±15.00 ±15.15
tc = -55°C to +85°C
—
±0.63
—
tc = -55°C to +85°C
—
—
15
—
—
50
—
output voltage
—
—
UNITS
V
±0.5
A
15
W
30
50
mV p-p
3
15
mV
mV
0 to 1 MHz
—
30
line regulation
vin min to max
—
3
10 —
load regulation
no load to full
—
5
15 —
5
15
continuous
17
28
40 17
28
40
transient 50 ms
—
—
50 —
—
50
no load
—
—
35 —
—
35
mA
10 kHz to 2 MHz
—
25
50
—
25
50
mA p-p
76
79
—
76
79
—
%
output ripple
input voltage
input current
input ripple
efficiency
Note
1.On dual output models at least 25% of the load should be on the positive output.
www.craneae.com/interpoint
V
10 kHz to 2 MHz
input current
input ripple
10
Page ­­­­­­­­­­­­­­­3 of 7
MHE Rev AC - 2016.03.16
V
DC-DC Converters
MHE Series
20 Watt
pin out
PinSingle OutputDual Output
1 Positive Input
Positive Input
2
Inhibit
Inhibit
3Output Adjust
Positive Output
4Output CommonOutput Common
5 Positive Output
Negative Output
6 No connection
No connection
7 No connection
No connection
8 Case Ground
Case Ground
9 No connection
No connection
10 Input Common
Input Common
Squared corner and dot on
top of cover indicate pin one.
1
10
4
5
9
8
7
6
Dotted line outlines flanged package option.
See cases H6 and K7 for dimensions.
Figure 1: Pin Out
model numbering key
Base Model
Input Voltage
MHE
28 12 S
F / ES
Output Voltage
Number of Outputs
(S = single, D = dual)
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
Output Adjustment all single output models:
The output can be adjusted upward by using the output adjust
(pin 3) The resistance between output adjust (pin 3) and output
common (pin 4) will determine the magnitude of the increase in the
output. The table above is applicable only to MHE2805S.
www.craneae.com/interpoint
3
BOTTOM VIEW
MHE
OUTPUT ADJUSTMENT RESISTOR VALUES
for Mhe2805s
ResistanceOutput Voltage
Pin 3 to 4Increase (%)
∞
0
390K +1%
145K +2%
63K +3%
22K +4%
0 +5%
2
Page ­­­­­­­­­­­­­­­4 of 7
MHE Rev AC - 2016.03.16
DC-DC Converters
MHE Series
20 Watt
BOTTOM VIEW CASE H6
Solder Seal
Dot on top of case indicates pin one
1.120 (28.45)
2
3
4
5
10
9
8
7
6
1.055 (26.80)
1.455 (36.96)
1.855 (47.12)
Solder Tip-off
1
0.655 (16.64)
0.040 dia
(1.02)
0.255 (6.48)
0.960 (24.38)
0.160 (4.06)
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/Tin
Cover
Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy, compression glass seal or ceramic seal
Case H6, Rev D, 20100211
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2010 Interpoint Corp. All rights reserved.
Figure 4: Case H6 – MHE non-Flanged
www.craneae.com/interpoint
Page ­­­­­­­­­­­­­­­5 of 7
MHE Rev AC - 2016.03.16
2.110 (53.59)
0.000
0.25 +0.05/-0.00
(6.4 +1.3/-0.0)
0.000
0.495 max (12.57)
0.000
DC-DC Converters
MHE Series
20 Watt
BOTTOM VIEW CASE K7
*Flanged case: Designator ("F") required in Case Option position of model number.
Solder Seal
Squared corner and dot on top
of case indicate pin one.
1.115 (28.32)
1
2
3
4
5
10
9
8
7
6
0.245
(6.22)
0.645
(16.38)
1.045
(26.54)
1.445
(36.70)
0.955 (24.26)
0.040 dia
(1.02)
2 x Dia 0.162 ±0.002
(4.11 ±0.05)
2 x R 0.170 (4.32)
0.555 (14.1)
Solder Tip-off
0.155 (3.94)
(2.910 max (73.91))
Flange Thickness: 0.067 +0.005/-0.007 (1.70 +0.13/-0.8)
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.
Case K7, Rev F, 20100419
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2010 Interpoint Corp. All rights reserved.
Figure 6: Case K7 – MHE Flanged
www.craneae.com/interpoint
Page ­­­­­­­­­­­­­­­6 of 7
MHE Rev AC - 2016.03.16
2.320
(58.93)
1.845
(46.86)
0.000
– 0.230
(5.84)
0.25 ±0.03
(6.4 ±0.8)
0.000
0.495 max (12.57)
0.000
DC-DC Converters
Table is for reference only. See individual Series' datasheets for specific screening.
MHE Series
20 Watt
ENVIRONMENTAL SCREENING STANDARD AND /ES, NON-QML1
TEST PERFORMED
pre-cap inspection
Method 2017, 2032
STANDARD
/ES
n
n
temperature cycle (10 times)
Method 1010, Cond. B, -55°C to +125°C, ambient
n
constant acceleration
Method 2001, 500 g
n
Burn-in Method 1015 2
96 hours
n
Final electrical test MiL-prF-38534, Group a
Subgroups 1 and 4: +25°C case
n
n
Hermeticity test
gross leak, Cond. C1, fluorocarbon
n
Fine leak, Cond. A2, helium
gross leak, Dip
n
n
Final visual inspection
Method 2009
n
n
Test methods are referenced to MIl-STD-883 as determined by MIl-PRF-38534.
Notes
1. Standard and /ES, non-QMl products, may not meet all of the requirements of MIl-PRF-38534.
2. Burn-in temperature designed to bring the case temperature to the maximum case temperature of the product. Refer to the specific
product information for the maximum case temperature. Burn-in is a powered test.
TABLE 10: ENVIRONMENTAL SCREENING DC-DC CONVERTERS AND EMI FILTERS STANDARD AND /ES, NON-QML
MHE Single and Dual - MHE Rev AC - 2016.03.16. This revision supersedes all previous releases. All 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 is a registered trademark of Crane Co. MHE Series is a trademark of Crane Electronics, Inc. Copyright © 1999 - 2015 Crane
Electronics, Inc. All rights reserved. http://www.craneae.com/interpoint
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