Interpoint MFW2812D Â 55â°c to 85â°c operation 50 v for 50 ms transient protection Datasheet

DC/DC Converters
28 Volt Input
mfw Series 70 Watt
NOT RECOMMENDED FOR NEW DESIGNS
Features
•
•
•
•
•
•
–55°C to + 85°C operation
19 to 40 VDC input
50 V for 50 ms transient protection
dual
Fully isolated
±12
±15
Fixed frequency switching
Remote sense on single models
•
Inhibit/sync function
•
Up to 84% efficiency
•
models
VDC Output
Indefinite short circuit protection
Size (max.): 3.20 x 2.46 x 0.595 inches (81.3 x 62.5 x 15.11 mm)
See case L for dimensions.
Weight:
140 grams typical
Screening: Standard or ES. See screening table for more information.
description
The MFW Series™ of DC/DC converters offers up to 70 watts of power
from dual or triple outputs in one package. Using hybrid thick film technology a power density of over 20 watts per cubic inch is achieved.
These devices are packaged in hermetically sealed cold rolled steel
enclosures with a tin plate finish making them ideal for use in military,
aerospace, or other high reliability applications. Unscreened models
are guaranteed to pass a gross leak test (maximum leak rate of 0.001
atm-cc/sec). Environmentally screened units (designated by the /ES
suffix) are hermetically solder sealed. See Section C2 for screening
specifications.
Design Methodology
The MFW Series converters utilize a quasi-square wave forward
converter design with a nominal switching frequency of 245 kHz.
Isolation between input and output is provided with a transformer in the
forward power loop and a wideband, temperature insensitive optical
link in the feedback control loop. Output regulation is accomplished
with constant frequency pulse width modulation. In addition, the load
regulation of the single output models is further enhanced through
the use of remote output voltage sense pins to overcome the adverse
effects of line resistance voltage drops. Short circuit protection is
provided by detecting peak primary switching current on a cycle by
cycle basis and limiting it to approximately 130% of the full load input
current. This method results in quick and positive current limiting under
short circuit conditions.
Low Noise
The MFW Series converters offer low noise on both the input and
output lines. A two section, four pole LC input filter is included to
provide very low reflected line ripple current. Adherence to MIL-STD461C (CE03) is possible with the addition of the FMB-461 filter. Output
ripple is maintained at less than 50 mV p-p for single and dual output
models and 85 mV for triple output models.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • [email protected]
www.interpoint.com
TRIPLE
+5 & ±12
+5 & ±15
Wide Voltage Range
All models of the MFW Series are designed to provide full power
operation over an input voltage range of 19 to 40 VDC. Operation
below an input of 19 volts, including operation in MIL-STD-704E emergency power conditions, is possible with derated output power. Please
refer to the derating information and the low voltage drop-out graphs
(Figures 10 and 11) on the following pages.
Wide Temperature Range
Full load operation of any of the MFW Series converters is available
at case temperatures of –55°C to + 85°C. Operation up to +125°C is
possible with derated output power. The MFW Series converters are
provided in a flange mount case designed to facilitate the removal of
internally generated heat. Because of this, heat sinking requirements
are minimal. Sustained full power operation does however require that
an efficient heat sink be attached to the baseplate. Please refer to the
heat sink requirements section for more information.
Inhibit/Sync Feature
Standard on all models of the MFW Series is a dual mode inhibit/sync
pin. This pin serves as both an output inhibit and as a synchronization
input. In the inhibit mode an open collector TTL compatible low (<0.8
V) will disable internal switching thereby inhibiting the unit’s output.
Inhibiting in this manner results in an extremely low quiescent current.
Since a pull-up resistor is included internally, this pin may be left open
should the inhibit function not be desired.
In a digital system it is often desirable to synchronize the input or
output ripple with the system clock. For this reason each model of the
MFW Series was designed to synchronize with a system clock applied
to the inhibit/sync pin. Please refer to the technical data section for
timing details for the external sync feature.
Page ­­­­­­­­­­­­­­­1 of 7
MFW Rev F 20100212
DC/DC Converters
absolute maximum ratings
sync and inhibit
Output Power
• 60 to 70 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –55°C to +125°C
Sync In (245 to 370 kHz.)
• Duty cycle 70% min, 98% max.
• Logic low 0.8V max
• Logic high 4.5 V min
• Referenced to input common
• If sync is not used, leave unconnected
Inhibit TTL Open Collector
• Logic low (output disabled)
Inhibit pin current 1 mA max
• Referenced to input common
• Logic high (output enabled)
V = ≥ 4.5V
recommended operating conditions
Input Voltage Range
• 19 to 40 VDC continuous (see Derating)
Case Operating Temperature (Tc)
• –40°C to +85°C full power
derating Output Power/Current and input voltage
Temperatures are referenced to the temperature at the converter’s baseplate
• Linearly derate output power/current from 100% at 85°C to 0% at 125°C.
• Above 105°C linearly derate steady state input voltage to 33 volts at 125°C.
• Indefinite short circuit protection is not guaranteed above 85°C case.
• Operation below an input voltage of 19 volts, including operation in MIL STD-704E emergency power conditions, is possible with derated output
power. See Figures 10 and 11.
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mfw series 70 Watt
Page ­­­­­­­­­­­­­­­2 of 7
MFW Rev F 20100212
typical characteristics
Output Voltage Temperature Coefficient
• 150 ppm/°C, typical
Input to Output Capacitance
• 160 pF, typical
Isolation
• 100 megohm minimum at 500 V
Conversion Frequency
• Free run mode 245 kHz, typical
Inhibit Pin Voltage (unit enabled)
• 4.5 to 5.5 V
DC/DC Converters
mfw series 70 Watt
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
dual and triple output models
PARAMETER
CONDITIONS
output voltage
output
current1,2
line regulation
cross
regulation4
TYP
MAX
— 4.95
5.05
5.10
4.95
5.05
main
—
—
—
—
—
—
—
4.0
10.0
—
4.0
10.0
dual
—
2.92
5.5
—
2.33
4.4
—
1.67
4.2
—
1.33
3.33
main
—
—
—
—
—
—
—
20
50
—
20
50
±dual
—
66.5
—
66.5
—
20
50
—
20
50
total
—
70
—
70
—
—
60
—
—
60
—
—
35
—
4.90
main
—
—
—
—
—
—
—
50
85
—
50
85
dual
—
30
50 —
30
50 —
50
85
—
50
85
2
20
—
2
20
100
200
—
100
200
5
20
—
5
20
600
—
300
450
main
—
—
—
—
—
—
dual
—
10
25 —
10
25 —
main
—
—
—
—
—
—
dual
—
25
50 —
25
50 —
480
—
1.5
3.0 —
1.5
3.0 —
—
— —
—
—
—
2.0
4.0 —
2.0
3.5 —
—
— —
—
—
—
—
—
—
—
—
—
2.3
6.0
—
2.3
5.0
—
—
—
—
—
—
—
5.4
9.0
—
5.0
7.0
19
28
40
19
28
40
19
28
40 19
28
40
dual
main +po = 33 w
dual
+po = 3 w to 27 w
-po = 27 w to 3 w
main +po = 3 w to 30 w
dual
±po = 15 w
input voltage
input ripple
current
MAX MIN
±15.05 ±15.30 ±15.55
+po = 3 w to 35 w
-po = 35 w
input current
mfw2815t
TYP
±11.65 ±11.80 ±12.05
+po = 20 w to 50 w
-po = 50 w to 20 w
cross
regulation5
mfw2812t
MIN
MAX
±14.85 ±15 ±15.15
35
— —
TYP
±11.88 ±12 ±12.12
vin =
19 to 40
no load
to full
MIN
—
full load
bw ≤ 2 MHz
—
mfw2815d
MAX
main
vin =
19 to 40
load regulation3
TYP
dual
full
load
output power1,2
output ripple
mfw2812d
MIN
—
—
no load
—
75
90
—
75
90
—
inhibited
—
30
35
—
30
35
—
full load
bw ≤ 10 MHz
—
15
40
—
15
40
60
110
—
60
110
30
35
—
30
35
—
15
40
—
15
40
UNITS
VDC
A
W
mV p-p
mV
mV
%
%
VDC
mA
mA p-p
efficiency
80
83
— 80
83
— 80
84
—
80
84
—
%
startup delay
—
15
25
15
25
6
10
—
6
10
ms
—
Notes
1.On dual output models the maximum combined output power is 70 watts.
A maximum of 95% (66.5 W) is available from any single output.
2.On triple output models the maximum combined output power is 60 watts.
A maximum of 50 watts is available from a single output.
3. Balanced loads
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—
4. Regulation effect on the negative dual output during the defined
conditions.
5. Regulation effect on both dual outputs during the defined conditions.
Page ­­­­­­­­­­­­­­­3 of 7
MFW Rev F 20100212
DC/DC Converters
Thermal Management
Calculating Maximum Ambient Temperature
The MFW Series of DC/DC converters has an upper operating
temperature of + 85°C at the baseplate of the case. The degree of
heat sinking required to remain within this limit may be determined
from Figure 1 which shows the maximum allowed internal power dissipation (PDISS vs. ambient temperature for various heat sink thermal
resistances. PDISS may be calculated as:
PDISS = POUT / efficiency – POUT
The efficiency for all combinations of POUT and VIN for the various
models may be obtained from the graphs on the preceding pages.
Example: Converter = MFW2815D, TAMB = 70°C,
VIN = 28 VDC, POUT = 45 watts
Efficiency = 85% (From Figure 7)
PDISS = (45 / 85) – 45 = 7.95 watts
From Figure 1 we can see that this situation will require thermal resistance of approximately 4.5°C / watt.
Conversely we may also find the maximum ambient temperature
which can be tolerated if we know the heat sink thermal resistance.
Example: Converter = MFW2805S, VIN = 28 VDC, POUT = 45 W.
Thermal Resistance = 3°C / watt.
Efficiency = 83.5% (From Figure 3)
PDISS = (45 / 0.835) – 45 = 8.89 watts.
mfw series 70 Watt
From Figure 1 we can see that the maximum allowed am­bient temperature is ap­prox­imately 75°C.
Heat Sink Recommendations
An MFW Series converter in still air (other than convective currents)
and with no conductive cooling paths other than through electrical
connections at the pins will exhibit a thermal resistance of approximately 4°C / watt. In cases where this value proves to be too high it is
recommended that additional heat sinking be supplied. The simplest
method of accomplishing this is to firmly attach the converter to a PCB
thereby providing a conductive thermal path. Secondly it is recommended that airflow be provided over the converter. Although each
situation requires a thorough thermal analysis these two measures
can reduce the thermal resistance to as low as 2°C / watt. If calculations indicate further heat sinking is required it is recommended that
additional thermal mass be provided either under the base plate or on
top of the converter’s mounting flanges or both.
PIN OUT
20
W
/W C/W °C/W °C/
4°CU=3° U=2 U=0
U=
Watts
15
10
5
PinDual OutputTriple Output
1Positive Input
Positive Input
2Case Ground
Case Ground
3Input Common
Input Common
4Inhibit/Sync In
Inhibit/Sync In
5Negative Output
Neg. Aux. Output
6Positive Output
Positive Aux. Output
7, 8Output CommonOutput Common
9, 10No ConnectionMain (+5) Output
Squared corner indicates pin one.
20° 40° 60° 80° 100° 120° 140°
Degrees Centigrade
Internal Power Dissipation (max)
vs. Ambient Temperature
1
2
3
4
Figure 1
BOTTOM VIEW
MFW
See case L for dimensions.
9
7
5
10
8
6
Figure 2: Pin Out
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Page ­­­­­­­­­­­­­­­4 of 7
MFW Rev F 20100212
DC/DC Converters
mfw series 70 Watt
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
87
19 V
19 V
85
83
83
83
81
79
28 V
77
Efficiency (%)
85
75
81
79
28 V
77
40 V
73
71
20
30
40
50
60
Output Power (Watts)
70
20
30
40
50
60
40 V
Output Power (Watts)
10
70
MFW2815D Efficiency vs Line & Load
Figure 3
28 V
77
71
10
MFW2812D Efficiency vs Line & Load
79
73
71
10
81
75
75
40 V
73
Figure 4
20
18
Input Voltage (Volts)
81
28 V
79
77
75
40 V
73
50
60
70
Figure 5
2815S
85
83
40
Output Power (Watts)
283R5S
17
2812S
16
2805S
Input Voltage (Volts)
19 V
30
MFW28512T Efficiency vs Line & Load
19
87
Efficiency (%)
87
19 V
85
Efficiency (%)
Efficiency (%)
87
18
MFW2815D
MFW2812D
17
MFW28512T
MFW28515T
16
15
15
71
10
20
30
40
50
60
Output Power (Watts)
70
MFW28515T Efficiency vs Line & Load
10
20
30
40
50
60
70
Output Power (Watts)
Low Line Dropout vs. Load (50 mV drop)
MFW Single Output Models
Figure 7
Figure 6
model numbering key
MFW
Base Model
Input Voltage
28 512 T / ES
Output Voltage
(Main and Aux. Vout for triple models)
Number of Outputs
(D = dual, T = triple)
Screening
(Standard screening has no designator
in this position.)
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Page ­­­­­­­­­­­­­­­5 of 7
MFW Rev F 20100212
10
20
30
40
50
60
Output Power (Watts)
70
Low Line Dropout vs. Load (50 mV drop)
MFW Dual and Triple Output Models
Figure 8
DC/DC Converters
mfw series 70 Watt
CASE L
Squared corner indicates pin one
Solder Seal
3.20 max (81.3)
0.141
dia. x 6
(3.58)
2.850 (72.39)
1
.0.040 +0.005/-0.002
(1.02 +0.13/-0.05)
2
3
4
BOTTOM VIEW
1.600 (40.64)
Solder Tip-off
9
7
5
10
8
6
0.550 (13.97)
0.350 (8.89)
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 pins 1-4, and 9-10
#52 alloy with copper core pins 5-8, ceramic seal
Case L, Rev C, 20060803
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 © 1999-2006 Interpoint Corp. All rights reserved.
Figure 9: Case l
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Page ­­­­­­­­­­­­­­­6 of 7
MFW Rev F 20100212
2.280 (57.91)
2.460 max (62.50)
1.625 (41.28)
1.325 (33.66)
1.425 (36.20)
1.025 (26.04)
0.825 (20.96)
0.625 (15.88)
0.00
0.180 (4.57)
0.250 +0.05/-0.00
(6.35 +1.3/-0.0)
0.000
0.040 +0.007/-0.000
(1.02 +0.18/-0.00)
0.595 max
(15.11)
0.000
DC/DC Converters
mfw series 70 Watt
STANDARD AND /ES (NON-QML) PRODUCTS
ENVIRONMENTAL SCREENING 1
standard
nOn-Qml2
/es
nOn-Qml2
Pre-cap Inspection
Method 2017, 2032
yes
yes
Temperature Cycle (10 times)
Method 1010, Cond. B, -55°C to +125°C, ambient
no
yes
Constant Acceleration
Method 2001, 500 g
no
yes
Burn-in
Method 1015 3
96 hours
no
yes
Final Electrical Test MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case
yes
yes
Hermeticity Test
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
Final visual inspection
Method 2009
yes
yes
test perFOrmed
test methods are referenced to mIL-StD-883 as determined by mIL-PRF-38534.
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. refers to products that do not offer QmL screening.
Notes:
Standard and /eS, non-QmL products, do not meet all of the requirements of mIL-PRF-38534.
1.2.Refers
to products that do not offer QML screening.
3. Burn-in designed to bring the case temperature to the maximum case temperature of the product. Refer to the specific product information
2. Standard
and /ES,
products, do not meet all of the requirements of MIL-PRF-38534.
for the maximum
casenon-QML
temperature.
3. Burn-in designed to bring the case temperature to the maximum case temperature of 85°C.
MFW Series DC/DC Converters, MFW Rev F 20100212. This revision supersedes all previous releases. 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. MFW Series is a trademark of Interpoint. Copyright © 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com
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