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Part Number MHF28xxx

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MODELS
VDC O
UTPUT
B2-77
Size (max.): 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm)
See Section B8, case E1 for dimensions.
Weight:
21 grams typical.
Screening:
Standard or ES.
See section C2 for screening options.
SINGLE
5
12
15
DUAL
±12
±15
DESCRIPTION
The MHF SeriesTM of DC/DC converters offer up to 12 watts of
power from single or dual outputs in a single package over a the full
military temperature range. Thick film hybrid manufacturing tech-
nology produces high levels of miniaturization, giving the MHF
Series converters a low profile (0.330 inch), small board area (1.65
square inches), and high power density (22 watt/in
3
).
The parts are packaged in hermetically sealed steel enclosures,
making them ideal for use in military, aerospace, and high reliability
industrial applications.
D
ESIGN
M
ETHODOLOGY
The MHF converters are switching regulators which use a quasi-
square wave, single ended forward converter design with a nominal
switching frequency of 600 kHz. Isolation between input and output
circuits is provided with a transformer in the forward power loop and
a temperature insensitive optical link in the feedback control loop.
Output regulation is accomplished with constant frequency pulse
width modulation. Both line and load regulation are typically within
10 mV.
On dual output models, the positive output is independently regu-
lated and the negative output is cross-regulated. Figures 7 and 8
illustrate what effects load changes have on the negative output.
Indefinite short circuit protection and overload protection are
provided by sensing output load current and restricting the output
current to approximately 125% of full load output current. Since the
output current is sensed in the secondary stage, the result is a
predictable, constant output current control with no foldback char-
acteristics. MHF converters are provided with internal filtering
elements on both the input and output to help reduce the need for
external components. For information about filtering to meet MIL-
STD-461's CE03 test, contact your Interpoint representative.
W
IDE
V
OLTAGE
R
ANGE
The MHF Series is designed to provide full power operation over the
input voltage range of 16 to 40 volts. The 15 volt models provide a
19 to 40 volt range. Operation below 16 volts (or 19 volts for the 15
volt models), including operation in MIL-STD-704E emergency
power conditions, is possible with derated output power. Please
refer to the low line drop-out graphs, Figures 9 and 10.
M
ILITARY
T
EMPERATURE
R
ANGE
The MHF Series provides full power operation at case temperatures
from ­55°C up to +125°C. All 12 and 15 volt models in both single
and dual output configurations provide full power operation at
+125°C with derated power to 135°C. The +5 volt model provides
full power at 110°C derated to 0% at 130°C. Depending on operating
levels, air flow, and ambient temperature; heat sinking may be
required.
I
NHIBIT
F
EATURE
An inhibit terminal is provided that can be used to disable internal
switching, resulting in a very low quiescent input current. An open
collector TTL compatible low (
0.8V) is required to control the inhibit
function. This level may be supplied by an open collector gate since
the inhibit pin is provided with an internal pull-up resistor.
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MHF SERIES
12 WATT
F
EATURES
· ­55° to +125°C operation
· 16 to 40 VDC input
(19 to 40 VDC for 15 volt outputs)
· Fully Isolated
· Optocoupler feedback
· Fixed frequency 600 kHz typical
· Forward converter topology
· 50 V for up to 50 ms transient protection
· Inhibit function
· Indefinite short circuit protection
· Up to 83% efficiency, 22 W/in
3
ABSOLUTE MAXIMUM RATINGS
TYPICAL CHARACTERISTICS
INHIBIT
RECOMMENDED OPERATING CONDITIONS
Input Voltage
· 16 to 40 VDC (19 to 40 VDC 15 volt output)
Output Power
· 12 watts (10 watts MHF2805S)
Lead Soldering Temperature (10 sec per lead)
· 300°C
Storage Temperature Range (Case)
· ­55°C to +135°C
B2-78
MHF SERIES
12 WATT
DC/DC C
ONVERTERS
Output Voltage Temperature Coefficient
· 150 ppm/°C, typical
Input to Output Capacitance
· 50 pF, typical
Current Limit
· 125% of full load, typical
Isolation
· 100 megohm minimum at 500 V
Conversion Frequency
· 600 kHz typical
Inhibit Pin Voltage (unit enabled)
· 8 to 11 V
Input Voltage Range
· 16 to 40 VDC continuous
· 19 to 40 VDC 15 volt outputs continuous
· 50 V for 50 msec transient
Case Operating Temperature (Tc)
· ­55°C to +125°C full power
· ­55°C to +110°C full power for MHF2805S
· ­55°C to +135°C absolute
· ­55°C to +130°C absolute for MHF2805S
Derating Output Power/Current
· Linearly from 100% at 125°C to 0% at 135°C
· Linearly from 100% at 110°C to 0% at 130°C
for MHF2805S
Inhibit TTL Open Collector
· Logic low (output disabled)
Logic low 0.8 V max
Inhibit pin current 4 mA max
· Referenced to input common
· Logic high (output enabled)
Open collector
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS
MHF2805S
MHF2812S
MHF2815S
PARAMETER
CONDITIONS
MIN TYP MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE
4.95
5.0
5.05
11.88
12
12.12
14.85
15
15.15
VDC
OUTPUT CURRENT
--
--
2.0
--
--
1.0
--
--
0.8
A
OUTPUT POWER
MIN. TO MAX. V
IN
--
--
10
--
--
12
--
--
12
W
OUTPUT RIPPLE
10 kHz to 2 MHz
--
40
60
--
30
60
--
25
50
mV p-p
LINE REGULATION
MIN. TO MAX. V
IN
--
10
50
--
10
50
--
10
50
mV
LOAD REGULATION
NO LOAD TO FULL
--
10
50
--
10
50
--
10
50
mV
INPUT VOLTAGE CONTINUOUS
16
28
40
16
28
40
19
28
40
VDC
TRANSIENT 50 ms
--
--
50
--
--
50
--
--
50
V
INPUT CURRENT
NO LOAD
--
20
30
--
20
30
--
20
30
FULL LOAD
--
--
483
--
--
557
--
--
535
mA
INHIBITED
--
2
3
--
2
3
--
2
3
INPUT RIPPLE
CURRENT
10 kHz TO 2 MHz
--
135
180
--
150
200
--
150
220
mA p-p
EFFICIENCY
74
77
--
77
81
--
80
83
--
%
LOAD FAULT
1
POWER DISSIPATION
OVERLOAD
--
--
5
--
--
5
--
--
5
W
SHORT CIRCUIT
--
­
3.5
--
--
2.8
--
--
2
START-UP
DELAY
--
180
300
--
80
200
--
150
250
ms
Notes
1. Indefinite short circuit protection not guaranteed above 125°C case temperature (110°C case for MHF2805S).
PIN OUT
Pin
Single Output
Dual Output
1
Inhibit
Inhibit
2
No connection
Positive Output
3
Output Common
Output Common
4
Positive Output
Negative Output
5
No connection
No connection
6
Case Ground
Case Ground
7
Input Common
Input Common
8
Positive Input
Positive Input
BOTTOM VIEW
MHF
Squared corner and dot on
top of cover indicate pin one.
1
2
3
4
5
8
7
6
B2-79
MHF SERIES
12 WATT
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
MHF2812D
MHF2815D
PARAMETER
CONDITION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE
+V
OUT
11.88
12.0
12.12
14.85
15.0
15.15
VDC
­ V
OUT
11.82
12.0
12.18
14.77
15.0
15.23
OUTPUT CURRENT
1, 2
--
0.5
1.0
--
0.4
0.8
A
OUTPUT POWER
2
+V
OUT
--
--
10.8
--
--
10.8
­ V
OUT
--
--
10.8
--
--
10.8
W
TOTAL
--
--
12
--
--
12
OUTPUT RIPPLE
VOLTAGE
10 kHz TO 2 MHz
--
30
60
--
30
60
mV p-p
LINE REGULATION
MIN. TO MAX. V
IN
+V
OUT
--
5
50
--
5
50
mV
LOAD REGULATION
NO LOAD TO FULL
+V
OUT
--
5
50
--
10
50
mV
CROSS REGULATION
20% TO 80% LOAD
3
--
5
10
--
4
8
%
50% LOAD
4
--
4
5
--
3
5
INPUT VOLTAGE
CONTINUOUS
16
28
40
19
28
40
VDC
NO LOAD TO FULL
TRANSIENT 50 ms
--
--
50
--
--
50
V
INPUT CURRENT
NO LOAD
--
25
35
--
25
35
FULL LOAD
--
--
550
--
--
536
mA
INHIBITED
--
1.9
3
--
1.9
3
INPUT RIPPLE
CURRENT
10 kHz TO 2 MHz
--
175
240
--
175
240
mA p-p
EFFICIENCY
78
81
--
80
83
--
%
LOAD FAULT
5
POWER DISSIPATION
SHORT CIRCUIT
--
--
2.8
--
--
2
W
OVERLOAD
--
--
5
--
--
5
START-UP
DELAY
--
150
250
--
150
250
ms
Notes
1. Applies to both outputs.
2. Maximum combined output power is 12 watts. A maximum of 90% is avail-
able from either output.
3. 20% to 80% load on the positive output and 80% to 20% on the negative
output. See Figure 8.
4. 50% load on the positive output and 50% to 20% load on the negative output.
50% load on the negative output and 50% to 20% load on the positive output.
See Figure 7.
5. Indefinite short circuit protection not guaranteed above 125°C case temper-
ature.
MODEL NUMBER KEY
MHF 28 12 D / ES
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
F
IGURE
1: P
IN
O
UT
See Section B8, case E1, for dimensions.
B2-80
MHF SERIES
12 WATT
DC/DC C
ONVERTERS
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, unless otherwise specified.
F
IGURE
5
F
IGURE
7
Output Power (Watts)
MHF2812D Efficiency
Efficiency (%)
50
90
80
70
60
2
4
6
8
10
12
16V
40V
28V
14
Output Load (%)
Condition A: 50% Load Pos. Vout, 50% to 20% Neg. Vout
Condition B: 50% Load Neg. Vout, 50% to 20% Pos. Vout
MHF Negative Output Voltage
Cross Regulation
Negative Output Voltage Change (%) ­10
0
10
2
30
40
50
­6
­4
­8
0
2
4
6
10
2812D
Cond. B
Cond. A
2812D
8
2
2815D
Output Power (Watts)
MHF2805S Efficiency
Efficiency (%)
50
90
80
70
60
2
4
6
8
10
12
28V
14
40V
16V
F
IGURE
2
Output Power (Watts)
MHF2812S Efficiency
Efficiency (%)
50
90
80
70
60
2
4
6
8
10
12
16V
40V
28V
14
F
IGURE
3
Output Power (Watts)
MHF2815D Efficiency
Efficiency (%)
50
90
80
70
60
2
4
6
8
10
12
19V
40V
28V
14
F
IGURE
6
F
IGURE
4
Output Power (Watts)
MHF2815S Efficiency
Efficiency (%)
50
90
80
70
60
2
4
6
8
10
12
19V
40V
28V
14
Output Load (%)
Positive Output 20% to 80% Load
Negative Output 80% to 20% Load
MHF Dual Negative Output Voltage
Cross Regulation
Negative Output Voltage Change (%) ­20
0
20
40
60
80
100
­10
­5
­15
0
5
10
15
20
2812D
2815D
F
IGURE
8
Output Power (Watts)
50 mV Drop
MHF Single Low Line Dropout
Input Voltage (Volts)
11
2
4
6
8
10
12
14
13
14
12
15
16
17
18
19
2812S
2815S
2805S
F
IGURE
9
F
IGURE
10
Output Power (Watts)
50 mV Drop
MHF Dual Low Line Dropout
Input Voltage (Volts)
11
2
4
6
8
10
12
14
13
14
12
15
16
17
18
19
2812D
2815D
218211-001-DTS Rev A
DQ# 1011
All technical 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. MHF Series is a trademark of Interpoint.
Copyright © 1992 - 1999 Interpoint. All rights reserved.
B8-10
CASE E
C
ASES
CASE E
BOTTOM VIEW
See Figures 16 ­ 18
for pin configurations.
Squared corner and dot on top
of case indicate pin one.
1.460 max
(37.08)
1.130 max
(28.70)
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
(SMHF Series
Cold Rolled Steel/Nickel/Gold)
Pins #52
alloy/Gold
compression glass seal
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.
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
2
3
4
5
0.030 dia.
(0.76)
8
7
6
MHF+ Series Single and Dual: Screening ­ Standard, ES, or 883
MHF Series and LIM5050 Module: Screening ­ Standard or ES
SMHF Series Single and Dual and SLIM5050 Module:
Screening ­ Space Standard, H, or K
HR120 Series: No screening options
BOTTOM VIEW CASE E1
0.330 max
(8.38)
0.000
0.25 (6.35)
Projection Weld
Seam Seal
Squared corner and dot on top
of case indicate pin one.
F
IGURE
16: C
ASE
E1
F
IGURE
15: C
ASE
E M
AXIMUM
D
IMENSIONS
Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer
to the numerical dimensions for accuracy.