MFW2815S/ES [CRANE]
DC/DC CONVERTERS 28 VOLT INPUT; DC / DC转换器, 28伏特的输入型号: | MFW2815S/ES |
厂家: | Crane Aerospace & Electronics. |
描述: | DC/DC CONVERTERS 28 VOLT INPUT |
文件: | 总9页 (文件大小:123K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
FEATURES
• –55°C to + 85°C operation
MFW SERIES
70 WATTS
DC/DC CONVERTERS
28 VOLT NPUT
• 19 to 40 VDC input
• Fully Isolated
I
• Optocoupler feedback
MODELS
VDC OUTPUT
• Fixed frequency, 245 kHz typical
• Topology – Push-Pull Forward
• 50 V for up to 50 ms transient protection
• Inhibit/sync function
SINGLE
DUAL
±12
±15
TRIPLE
+5 & ±12
+5 & ±15
5
12
15
• Indefinite short circuit protection
• Remote sense on single models
• Up to 84% efficiency
Size (max.): 3.20 x 2.46 x 0.595 inches (81.3 x 62.5 x 15.11 mm)
See Section B8, case L, for dimensions.
Weight:
140 grams typical
Screening: Standard or ES.See Section C2 for screening
options, see Section A5 for ordering information.
DESCRIPTION
WIDE VOLTAGE RANGE
The MFW Series™ of DC/DC converters offers up to 70 watts of
power from single, 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.
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 base-
plate. Please refer to the heat sink requirements section for more
information.
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 accom-
plished 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.
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.
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-
STD-461C (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.
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.
B4-3
MFW SERIES
70 WATT
DC/DC CONVERTERS
ABSOLUTE MAXIMUM RATINGS
SYNC AND INHIBIT
TYPICAL CHARACTERISTICS
Output Power
Sync In (245 to 370 kHz.)
• Duty cycle 70% min, 98% max
• Logic low 0.8 V max
Output Voltage Temperature Coefficient
• 150 ppm/°C, typical
Input to Output Capacitance
• 160 pF, typical
• 60 to 70 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
• Logic high 4.5 V min
Storage Temperature Range (Case)
• –55°C to +125°C
• 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 = ≥ 4.5 V
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
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 19 to 40 VDC continuous (see Derating)
Case Operating Temperature (Tc)
• –55°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.
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUTS
PARAMETER
MFW2805S
MFW2812S
MFW2815S
CONDITION
MIN TYP MAX
MIN TYP MAX
MIN. TYP MAX
UNITS
OUTPUT
VOLTAGE
FULL LOAD
4.95 5.00
5.05
12.00
60
11.88 12.00 12.12
14.85 15.00 15.15
VDC
OUTPUT
CURRENT
V
= 19 TO 40
IN
—
—
—
—
—
19
—
—
30
10
10
28
—
—
—
—
—
19
—
—
30
10
10
28
5.83
70
—
—
—
—
—
19
—
—
30
10
10
28
4.67
70
A
W
OUTPUT
POWER
Tc = –55°C TO +85°C
OUTPUT
RIPPLE
FULL LOAD BW ≤2 MHz
50
50
50
mV p-p
mV
LINE
REGULATION
V
= 19 TO 40
20
20
20
IN
LOAD
REGULATION
NO LOAD TO FULL
20
25
25
mV
INPUT
40
40
40
VDC
VOLTAGE
INPUT
NO LOAD
INHIBITED
—
—
75
30
90
35
—
—
70
30
90
35
—
—
70
30
90
35
mA
CURRENT
INPUT REFL.
RIPPLE
FULL LOAD
BW ≤10 MHz
—
10
25
—
10
25
—
10
25
mA p-p
EFFICIENCY
78
—
80
5
—
81
—
83
8
—
81
—
83
8
—
%
STARTUP
DELAY
WITH LOW
IMPEDANCE SOURCE
10
10
10
ms
B4-4
MFW SERIES
70 WATT
DC/DC CONVERTERS
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
DUAL AND TRIPLE OUTPUTS
MFW2812D
MFW2815D
MFW28512T
MFW28515T
PARAMETER
CONDITION
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
5.10
MIN
TYP
MAX
5.05
UNITS
OUTPUT
VOLTAGE
FULL
LOAD
MAIN
DUAL
—
—
—
—
—
—
4.95
5.05
4.90
4.95
VDC
±11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15 ±11.65 ±11.80 ±12.05 ±15.05 ±15.30 ±15.55
OUTPUT
CURRENT
V
=
MAIN
DUAL
—
—
—
2.92
—
5.5
—
—
—
2.33
—
4.4
—
—
4.0
1.67
10.0
4.2
—
—
4.0
1.33
10.0
3.33
IN
19 TO 40
A
1, 2
MAIN
±DUAL
TOTAL
—
—
—
—
35
—
—
66.5
70
—
—
—
—
35
—
—
66.5
70
—
—
—
20
20
—
50
50
60
—
—
—
20
20
—
50
50
60
OUTPUT
POWER
W
1, 2
OUTPUT
RIPPLE
FULL LOAD
BW ≤ 2 MHz
MAIN
DUAL
—
—
—
30
—
50
—
—
—
30
—
50
—
—
50
50
85
85
—
—
50
50
85
85
mV p-p
mV
LINE
V
=
MAIN
DUAL
—
—
—
—
—
—
—
—
—
—
2
20
—
—
2
20
IN
REGULATION 19 TO 40
3
10
25
10
25
100
200
100
200
LOAD
NO LOAD
MAIN
DUAL
—
—
—
25
—
50
—
—
—
25
—
50
—
—
5
480
20
600
—
—
5
300
20
450
mV
REGULATION TO FULL
4
CROSS
DUAL
REGULATION +PO = 3 W TO 35 W
–PO = 35 W
—
—
1.5
2.0
3.0
4.0
—
—
1.5
2.0
3.0
3.5
—
—
—
—
—
—
—
—
—
—
—
—
+PO = 20 W TO 50 W
–PO = 50 W TO 20 W
%
5
CROSS
MAIN +PO = 33 W
REGULATION DUAL
+PO = 3 W TO 27 W
—
—
—
—
—
—
—
2.3
6.0
—
2.3
5.0
–PO = 27 W TO 3 W
MAIN
%
+PO = 3 W TO 30 W
DUAL ±PO = 15 W
—
—
—
—
—
—
—
5.4
28
9.0
40
—
5.0
28
7.0
40
INPUT
VOLTAGE
19
28
40
19
28
40
19
19
VDC
mA
INPUT
CURRENT
NO LOAD
INHIBITED
—
—
75
30
90
35
—
—
75
30
90
35
—
—
60
30
110
35
—
—
60
30
110
35
INPUT REFL.
RIPPLE
FULL LOAD
BW ≤10 MHz
—
15
40
—
15
40
—
15
40
—
15
40
mA p-p
EFFICIENCY
80
—
83
15
—
80
—
83
15
—
80
—
84
6
—
80
—
84
6
—
%
STARTUP
DELAY
25
25
10
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.
4. Regulation effect on the negative dual output during the defined conditions.
5. Regulation effect on both dual outputs during the defined conditions.
B4-5
MFW SERIES
70 WATT
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
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 approxi-
mately 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.
dissipation (P
vs. ambient temperature for various heat sink
DISS
thermal resistances. P
may be calculated as:
DISS
P
= P
/ efficiency – P
DISS
OUT OUT
The efficiency for all combinations of P
and V for the various
IN
OUT
models may be obtained from the graphs on the preceding pages.
Example: Converter = MFW2815D, T = 70°C,
AMB
V
= 28 VDC, P
= 45 watts
IN
OUT
Efficiency = 85% (From Figure 7)
= (45 / 85) – 45 = 7.95 watts
P
DISS
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, V = 28 VDC, P
IN
= 45 W.
OUT
Thermal Resistance = 3°C / watt.
Efficiency = 83.5% (From Figure 3)
P
= (45 / 0.835) – 45 = 8.89 watts.
DISS
From Figure 1 we can see that the maximum allowed ambient
temperature is approximately 75°C.
20
15
10
5
20° 40° 60° 80° 100° 120° 140°
Degrees Centigrade
Internal Power Dissipation (max)
vs. Ambient Temperature
FIGURE 1
B4-6
MFW SERIES
70 WATT
DC/DC CONVERTERS
PIN OUT
Squared corner indicates pin one.
1
2
3
4
Pin
1
Single Output
Positive Input
Case Ground
Dual Output
Positive Input
Case Ground
Input Common
Inhibit/Sync In
Triple Output
Positive Input
Case Ground
Input Common
Inhibit/Sync In
2
3
Input Common
Inhibit/Sync In
Negative Sense
Positive Sense
Output Common
Positive Output
4
BOTTOM VIEW
MFW
5
Negative Output Negative Aux. Output
Positive Output Positive Aux. Output
Output Common Output Common
6
7, 8
9, 10
No Connection
Main (+5) Output
See Section B8, case L, for dimensions.
9
7
5
10
8
6
FIGURE 2: PIN OUT
MODEL NUMBERING KEY
MFW 28 512
Base Model
T / ES
Input Voltage
Output Voltage
(Main and Aux. Vout for triple models)
Number of Outputs
(S = single, D = dual, T = triple)
Screening
(Standard screening has no designator
in this position.)
B4-7
MFW SERIES
70 WATT
DC/DC CONVERTERS
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
86
85
84
83
82
81
80
79
78
89
88
87
86
85
84
83
82
81
89
88
87
86
85
84
83
82
81
20 V
19 V
19 V
28 V
28 V
28 V
40 V
70
40 V
70
40 V
70
10
20
30
40
50
60
10
20
30
40
50
60
10
20
30
40
50
60
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
MFW2815S Efficiency vs Line & Load
MFW2805S Efficiency vs Line & Load
MFW2812S Efficiency vs Line & Load
FIGURE 3
FIGURE 4
FIGURE 5
87
87
87
19 V
19 V
19 V
85
83
81
85
83
81
85
83
81
79
79
79
28 V
28 V
28 V
77
75
77
75
77
75
40 V
40 V
73
73
73
40 V
71
71
71
10
20
30
40
50
60
70
10
20
30
40
50
60
70
10
20
30
40
50
60
70
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
MFW2815D Efficiency vs Line & Load
MFW28512T Efficiency vs Line & Load
MFW2812D Efficiency vs Line & Load
FIGURE 6
FIGURE 7
FIGURE 8
19
87
19 V
MFW2815D
18
2815S
85
83
81
MFW2812D
18
283R5S
17
28 V
17
79
2812S
16
77
75
MFW28512T
MFW28515T
16
2805S
15
40 V
73
15
71
10
20
30
40
50
60
70
10
20
30
40
50
60
70
10
20
30
40
50
60
70
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
Low Line Dropout vs. Load (50 mV drop)
MFW Single Output Models
Low Line Dropout vs. Load (50 mV drop)
MFW Dual and Triple Output Models
MFW28515T Efficiency vs Line & Load
FIGURE 9
FIGURE 10
FIGURE 11
20621-001-DTS Rev A
DQ# 1016
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 © 1991- 1999 Interpoint. All rights reserved.
B4-8
CASE L
CASES
0.060 min
(1.52)
CASE L
TOP VIEW
Cover Placement
and
Min/Max Dimensions
See Figure 50
for pin configuration
3.20 max (81.3)
0.060 min
(1.52)
2.46 max (62.5)
0.337 min
(8.56)
0.337 min
(8.56)
Squared corner indicates pin one
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 dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.2) 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.
FIGURE 49: CASE L MAXIMUM DIMENSIONS
B8-31
CASE L
CASES
CASE L
MFW Series: Screening – Standard or ES
HR700 Series: no screening options
Squared corner indicates pin one
Solder Seal
0.141 x 6
(3.58)
2.850 (72.39)
1
2
3
4
.0.040 +0.005/-0.002
(1.02 +0.13/-0.05)
BOTTOM VIEW
1.600 (40.64)
9
7
8
5
Solder Tip-off
0.550 (13.97)
0.350 (8.89)
10
6
0.000
FIGURE 50: CASE L DIMENSIONS
B8-32
QA SCREENING
85°C PRODUCTS
85°C PRODUCTS
TEST (85°C Products excluding HR products)
STANDARD
/ES
yes
yes
yes
yes
yes
PRE-CAP INSPECTION
Method 2017
yes
no
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. B, -55°C to 125°C
CONSTANT ACCELERATION
Method 2001, 500 g
no
BURN-IN
96 hours at 70°C ambient (typical)
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case
HERMETICITY TESTING
no
yes
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
no
no
yes
yes
no
-3
Gross Leak, Dip (1 x 10 )
yes
FINAL VISUAL INSPECTION
Method 2009
yes
yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Applies to the following products:
MFW Series
MTW Series
MHE/MLP Series
MHL Series
MRH Series
MTO Series
MSR Series
DCH Series
FM/FMA/FMB EMI Filters
MSF EMI Filter
C2-12
相关型号:
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