Crane MHF2812S Dc/dc converters 28 volt input Datasheet

FEATURES
MHF SERIES
12 WATT
DC/DC CONVERTERS
28 VOLT INPUT
• –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/in3
MODELS
VDC OUTPUT
SINGLE
5
12
15
DUAL
±12
±15
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.
DESCRIPTION
The MHF Series™ 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 technology 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/in3).
The parts are packaged in hermetically sealed steel enclosures,
making them ideal for use in military, aerospace, and high reliability
industrial applications.
DESIGN METHODOLOGY
The MHF converters are switching regulators which use a quasisquare 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 regulated 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 characteristics. 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 MILSTD-461’s CE03 test, contact your Interpoint representative.
WIDE VOLTAGE RANGE
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.
MILITARY TEMPERATURE RANGE
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.
INHIBIT FEATURE
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.
B2-77
MHF SERIES
12 WATT
DC/DC CONVERTERS
INHIBIT
ABSOLUTE MAXIMUM RATINGS
TYPICAL CHARACTERISTICS
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
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
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
RECOMMENDED OPERATING CONDITIONS
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
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
MHF2805S
MHF2812S
MHF2815S
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
—
—
10
—
—
12
—
—
12
W
OUTPUT POWER
OUTPUT RIPPLE
CONDITIONS
MIN. TO MAX. VIN
10 kHz to 2 MHz
—
40
60
—
30
60
—
25
50
mV p-p
LINE REGULATION
MIN. TO MAX. VIN
—
10
50
—
10
50
—
10
50
mV
LOAD REGULATION
NO LOAD TO FULL
—
10
50
—
10
50
—
10
50
mV
CONTINUOUS
16
28
40
16
28
40
19
28
40
VDC
TRANSIENT 50 ms
—
—
50
—
—
50
—
—
50
V
NO LOAD
—
20
30
—
20
30
—
20
30
FULL LOAD
—
—
483
—
—
557
—
—
535
INHIBITED
—
2
3
—
2
3
—
2
3
INPUT VOLTAGE
INPUT CURRENT
mA
INPUT RIPPLE
CURRENT
10 kHz TO 2 MHz
EFFICIENCY
LOAD FAULT1
START-UP
—
135
180
—
150
200
—
150
220
mA p-p
74
77
—
77
81
—
80
83
—
%
POWER DISSIPATION
OVERLOAD
—
—
5
—
—
5
—
—
5
SHORT CIRCUIT
—
–
3.5
—
—
2.8
—
—
2
DELAY
—
180
300
—
80
200
—
150
250
Notes
1. Indefinite short circuit protection not guaranteed above 125°C case temperature (110°C case for MHF2805S).
B2-78
W
ms
MHF SERIES
12 WATT
DC/DC CONVERTERS
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT RIPPLE
VOLTAGE
MIN
MHF2815D
TYP
MAX
MIN
+VOUT
11.88
12.0
12.12
14.85
15.0
15.15
– VOUT
11.82
12.0
12.18
14.77
15.0
15.23
OUTPUT CURRENT1, 2
OUTPUT POWER2
MHF2812D
TYP
MAX
CONDITION
UNITS
VDC
—
0.5
1.0
—
0.4
0.8
+VOUT
—
—
10.8
—
—
10.8
A
– VOUT
—
—
10.8
—
—
10.8
TOTAL
—
—
12
—
—
12
10 kHz TO 2 MHz
—
30
60
—
30
60
mV p-p
+VOUT
—
5
50
—
5
50
mV
mV
W
LINE REGULATION
MIN. TO MAX. VIN
LOAD REGULATION
NO LOAD TO FULL
CROSS REGULATION
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
+VOUT
—
5
50
—
10
50
20% TO 80% LOAD3
—
5
10
—
4
8
50% LOAD4
—
4
5
—
3
5
%
CONTINUOUS
16
28
40
19
28
40
VDC
TRANSIENT 50 ms
—
—
50
—
—
50
V
NO LOAD
FULL LOAD
INHIBITED
—
—
—
25
—
1.9
35
550
3
—
—
—
25
—
1.9
35
536
3
mA
—
175
240
—
175
240
mA p-p
78
81
—
80
83
—
%
INPUT RIPPLE
CURRENT
10 kHz TO 2 MHz
EFFICIENCY
LOAD FAULT5
START-UP
POWER DISSIPATION
SHORT CIRCUIT
—
—
2.8
—
—
2
OVERLOAD
—
—
5
—
—
5
DELAY
—
150
250
—
150
250
Notes
1. Applies to both outputs.
2. Maximum combined output power is 12 watts. A maximum of 90% is available from either output.
3. 20% to 80% load on the positive output and 80% to 20% on the negative
output. See Figure 8.
W
ms
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 temperature.
PIN OUT
Pin
1
2
3
4
5
6
7
8
Single Output
Inhibit
No connection
Output Common
Positive Output
No connection
Case Ground
Input Common
Positive Input
Dual Output
Inhibit
Positive Output
Output Common
Negative Output
No connection
Case Ground
Input Common
Positive Input
Squared corner and dot on
top of cover indicate pin one.
MODEL NUMBER KEY
MHF
28 12
D / ES
Base Model
1
2
3
4
5
Number of Outputs
(S = single, D = dual)
BOTTOM VIEW
MHF
8
7
Input Voltage
Output Voltage
Screening
(Standard screening has no designator
in this position.)
6
See Section B8, case E1, for dimensions.
FIGURE 1: PIN OUT
B2-79
MHF SERIES
12 WATT
DC/DC CONVERTERS
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, unless otherwise specified.
90
90
90
16V
80
40V
70
28V
60
50
80
40V
70
28V
60
2
4
6
8
10
12
50
14
2
4
6
8
10
12
50
14
2
4
6
8
10
12
Output Power (Watts)
Output Power (Watts)
MHF2805S Efficiency
MHF2812S Efficiency
MHF2815S Efficiency
19V
80
Efficiency (%)
40V
70
28V
40V
70
28V
60
60
50
4
6
8
10
12
14
2
4
6
8
10
12
Output Power (Watts)
Output Power (Watts)
MHF2812D Efficiency
MHF2815D Efficiency
14
Negative Output Voltage Change (%)
90
80
14
FIGURE 4
FIGURE 3
16V
Efficiency (%)
28V
Output Power (Watts)
90
2
40V
70
60
FIGURE 2
50
Efficiency (%)
Efficiency (%)
Efficiency (%)
19V
16V
80
10
8
6
Cond. A
2812D
4
2
0
2815D
2
–4
2812D
–6
Cond. B
–8
–10
0
10
2
30
40
50
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
FIGURE 6
19
15
18
10
17
5
0
2815D
–5
2812D
–10
–15
–20
19
18
2815S
16
15
2812S
14
13
2805S
12
0
20
40
60
80
100
Output Load (%)
Positive Output 20% to 80% Load
Negative Output 80% to 20% Load
MHF Dual Negative Output Voltage
Cross Regulation
FIGURE 8
B2-80
FIGURE 7
Input Voltage (Volts)
20
Input Voltage (Volts)
Negative Output Voltage Change (%)
FIGURE 5
11
17
2815D
16
15
14
13
2812D
12
2
4
6
8
10
12
14
11
2
4
6
8
10
12
14
Output Power (Watts)
50 mV Drop
Output Power (Watts)
50 mV Drop
MHF Single Low Line Dropout
MHF Dual Low Line Dropout
FIGURE 9
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.
FIGURE 10
CASES
CASE E
Squared corner and dot on top
of case indicate pin one.
CASE E
BOTTOM VIEW
See Figures 16 – 18
for pin configurations.
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
1.460 max
(37.08)
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.
FIGURE 15: CASE E MAXIMUM DIMENSIONS
BOTTOM VIEW CASE E1
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
Seam Seal
Projection Weld
Squared corner and dot on top
of case indicate pin one.
0.960
(24.38)
1
2
3
4
5
0.030 dia.
(0.76)
0.205
(5.21)
0.000
0.25 (6.35)
0.000
0.330 max
(8.38)
0.25 (6.35)
0.000
0.330 max
(8.38)
7
6
0.505
(12.83)
0.705
(17.91)
0.905
(22.99)
1.105
(28.07)
8
0.160
(4.06)
0.000
FIGURE 16: CASE E1
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.
B8-10
QA SCREENING
125°C PRODUCTS
125°C PRODUCTS
TEST (125°C Products)
STANDARD
/ES
/883 (Class H)*
PRE-CAP INSPECTION
Method 2017, 2032
yes
yes
yes
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. C, -65°C to 150°C
Method 1010, Cond. B, -55°C to 125°C
no
no
no
yes
yes
no
CONSTANT ACCELERATION
Method 2001, 3000 g
Method 2001, 500 g
no
no
no
yes
yes
no
BURN-IN
Method 1015, 160 hours at 125°C
96 hours at 125°C case (typical)
no
no
no
yes
yes
no
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 through 6: -55°C, +25°C, +125°C
Subgroups 1 and 4: +25°C case
no
yes
no
yes
yes
no
HERMETICITY TESTING
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10-3)
no
no
yes
yes
yes
no
yes
yes
no
FINAL VISUAL INSPECTION
Method 2009
yes
yes
yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
*883 products are built with element evaluated components and are 100% tested and guaranteed over
the full military temperature range of –55°C to +125°C.
Applies to the following products
MOR Series
MHD Series
MFLHP Series
MHV Series
MFL Series
MHF+ Series
MHP Series
MHF Series**
MTR Series
MGA Series
MQO Series**
MSA Series
MGH Series
MCH Series
FM-704A EMI Filter
FMD**/FME EMI Filter
FMC EMI Filter
FMH EMI Filter
FMGA EMI Filter
FMSA EMI Filter
HUM Modules**
LCM Modules**
LIM Modules
**MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer
‘883” screening.
C2-10
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