MFW2812T [CRANE]
â55°C to 85°C operation 50 V for 50 ms transient protection;
| 型号： | MFW2812T |
| 厂家： | 
Crane Aerospace & Electronics. |
| 描述： | â55°C to 85°C operation 50 V for 50 ms transient protection 输出元件 |
| 文件： | 总7页 (文件大小：491K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
28 VOlt Input
NOT RECOMMENDED FOR NEW DESIGNS
Features
•ꢀ –55°Cꢀtoꢀ+ꢀ85°Cꢀoperation
•ꢀ 19ꢀtoꢀ40ꢀVDCꢀinput
ꢀꢁꢂELS
VDC Output
•ꢀ 50ꢀVꢀforꢀ50ꢀmsꢀtransientꢀprotection
•ꢀ Fullyꢀisolated
Dual
tRIplE
+5 & ±12
+5 & ±15
±12
±15
•ꢀ Fixedꢀfrequencyꢀswitching
•ꢀ Remoteꢀsenseꢀonꢀsingleꢀmodels
•ꢀ Inhibit/syncꢀfunction
•ꢀ Indefiniteꢀshortꢀcircuitꢀprotection
•ꢀ Upꢀtoꢀ84%ꢀefficiency
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 ꢀFW Series™ of ꢂC/ꢂC converters offers up to 70 watts of power
from dual or triple outputs in one package. Using hybrid thick film tech-
nology 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.
wIDE VOltagE RangE
All models of the ꢀFW Series are designed to provide full power
operation over an input voltage range of 19 to 40 VꢂC. ꢁperation
below an input of 19 volts, including operation in ꢀIL-STꢂ-704E emer-
gency 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 ꢀFW Series converters is available
at case temperatures of –55°C to + 85°C. ꢁperation up to +125°C is
possible with derated output power. The ꢀFW 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.
DEsIgn MEthODOlOgy
The ꢀFW 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. ꢁutput 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.
InhIbIt/synC FEatuRE
Standard on all models of the ꢀFW 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 ꢀFW 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 ꢀIL-STꢂ-
461C (CE03) is possible with the addition of the FꢀB-461 filter. ꢁutput
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
ꢀFW 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.
Crane Aerospace & Electronics
Page 1 of 7
ꢁFꢂꢀRevꢀFꢀ20100212
Electronics Group (Interpoint Brand)
POꢀBoxꢀ97005ꢀꢀ•ꢀꢀRedmondꢀꢂAꢀ98073-9705
425.882.3100ꢀꢀꢀ•ꢀꢀꢀpower@crane-eg.com
www.interpoint.com
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
absOlute maximum ratings
oꢀꢁꢂꢀꢁ pꢃwꢄꢅ
sync and inhibit
syꢉꢋ iꢉ (245 ꢁꢃ 370 kHz.)
ꢀ •ꢀ60ꢀtoꢀ70ꢀwattsꢀdependingꢀonꢀmodel
Lꢄꢆꢇ sꢃlꢇꢄꢅꢈꢉg tꢄmꢂꢄꢅꢆꢁꢀꢅꢄ (10 ꢊꢄꢋ ꢂꢄꢅ lꢄꢆꢇ)
ꢀ •ꢀ300°C
ꢀ •ꢀDutyꢀcycleꢀ70%ꢀmin,ꢀ98%ꢀmax.ꢀ
ꢀ •ꢀLogicꢀlowꢀ0.8Vꢀmax
ꢀ •ꢀLogicꢀhighꢀ4.5ꢀVꢀmin
sꢁꢃꢅꢆgꢄ tꢄmꢂꢄꢅꢆꢁꢀꢅꢄ rꢆꢉgꢄ (cꢆꢊꢄ)
ꢀ •ꢀ–55°Cꢀtoꢀ+125°C
ꢀ •ꢀReferencedꢀtoꢀinputꢀcommon
ꢀ •ꢀIfꢀsyncꢀisꢀnotꢀused,ꢀleaveꢀunconnected
iꢉhꢈbꢈꢁ ttL oꢂꢄꢉ cꢃllꢄꢋꢁꢃꢅ
ꢀ •ꢀLogicꢀlowꢀ(outputꢀdisabled)
Inhibit pin current 1 mA max
ꢀ •ꢀReferencedꢀtoꢀinputꢀcommon
ꢀ •ꢀLogicꢀhighꢀ(outputꢀenabled)
ꢀ ꢀ ꢀ Vꢀ=ꢀ≥ꢀ4.5V
recOmmended Operating cOnditiOns
iꢉꢂꢀꢁ Vꢃlꢁꢆgꢄ rꢆꢉgꢄ
ꢀ •ꢀ19ꢀtoꢀ40ꢀVDCꢀcontinuousꢀ(seeꢀDerating)
cꢆꢊꢄ oꢂꢄꢅꢆꢁꢈꢉg tꢄmꢂꢄꢅꢆꢁꢀꢅꢄ (tꢋ)
ꢀ •ꢀ–40°Cꢀtoꢀ+85°Cꢀfullꢀpower
typical characteristics
oꢀꢁꢂꢀꢁ Vꢃlꢁꢆgꢄ tꢄmꢂꢄꢅꢆꢁꢀꢅꢄ cꢃꢄffꢈꢋꢈꢄꢉꢁ
ꢀ •ꢀ150ꢀppm/°C,ꢀtypical
iꢉꢂꢀꢁ ꢁꢃ oꢀꢁꢂꢀꢁ cꢆꢂꢆꢋꢈꢁꢆꢉꢋꢄ
ꢀ •ꢀ160ꢀpF,ꢀtypical
iꢊꢃlꢆꢁꢈꢃꢉ
ꢀ •ꢀ100ꢀmegohmꢀminimumꢀatꢀ500ꢀV
cꢃꢉvꢄꢅꢊꢈꢃꢉ Fꢅꢄqꢀꢄꢉꢋy
ꢀ •ꢀFreeꢀrunꢀmodeꢀ245ꢀkHz,ꢀtypical
iꢉhꢈbꢈꢁ pꢈꢉ Vꢃlꢁꢆgꢄ (ꢀꢉꢈꢁ ꢄꢉꢆblꢄꢇ)
ꢀ •ꢀ4.5ꢀtoꢀ5.5ꢀV
derating Output pOwer/current and input vOltage
tꢄmꢂꢄꢅꢆꢁꢀꢅꢄꢊ ꢆꢅꢄ ꢅꢄfꢄꢅꢄꢉꢋꢄꢇ ꢁꢃ ꢁhꢄ ꢁꢄmꢂꢄꢅꢆꢁꢀꢅꢄ ꢆꢁ ꢁhꢄ ꢋꢃꢉvꢄꢅꢁꢄꢅ’ꢊ bꢆꢊꢄ-
ꢂlꢆꢁꢄ
ꢀ •ꢀLinearlyꢀderateꢀoutputꢀpower/currentꢀfromꢀ100%ꢀatꢀ85°Cꢀtoꢀ0%ꢀatꢀ125°C.
ꢀ •ꢀAboveꢀ105°Cꢀlinearlyꢀderateꢀsteadyꢀstateꢀinputꢀvoltageꢀtoꢀ33ꢀvoltsꢀatꢀ125°C.
ꢀ •ꢀIndefiniteꢀshortꢀcircuitꢀprotectionꢀisꢀnotꢀguaranteedꢀaboveꢀ85°Cꢀcase.
ꢀ •ꢀOperationꢀbelowꢀanꢀinputꢀvoltageꢀofꢀ19ꢀvolts,ꢀincludingꢀoperationꢀinꢀꢁIL-
STꢂ-704E emergency power conditions, is possible with derated output
power. See Figures 10 and 11.
www.interpoint.com
Page 2 of 7
ꢁFꢂꢀRevꢀFꢀ20100212
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
Electrical Characteristics: 25°C Tc, 28 VꢂC Vin, 100% load, free run, unless otherwise specified.
DUALꢀAꢄDꢀꢅRIPLꢃꢀOUꢅPUꢅꢀꢁODꢃLS
ꢀFW2812ꢂ
ꢀFW2815ꢂ
ꢀFW2812T
typ
ꢀFW2815T
typ
unIts
VꢂC
A
paRaMEtER
COnDItIOns
MIn
typ
MaX MIn
typ
MaX MIn
4.95
MaX MIn
MaX
Output VOltagE
Full
lOaD
MaIn
Dual
MaIn
Dual
—
—
—
—
—
—
5.05
5.10 4.90
4.95
5.05
±11.88 ±12 ±12.12 ±14.85 ±15 ±15.15 ±11.65±11.80±12.05 ±15.05 ±15.30 ±15.55
Output
V
=
—
—
—
—
—
—
—
—
—
—
—
—
2.92
—
—
5.5
—
—
—
—
—
—
—
—
—
—
—
—
—
2.33
—
—
4.4
—
—
—
—
—
—
—
—
—
—
—
—
4.0
1.67
20
20
—
10.0
4.2
50
—
—
—
—
—
—
—
—
—
—
—
4.0
1.33
20
20
—
10.0
3.33
50
In
1,2
CuRREnt
19 tO 40
1,2
Output pOwER
MaIn
±Dual
tOtal
35
—
66.5
70
35
—
66.5
70
50
50
W
60
60
Full lOaD
bw ≤ 2 ꢀHz
Output RIpplE
lInE REgulatIOn
lOaD REgulatIOn
CROss
MaIn
Dual
MaIn
Dual
MaIn
Dual
—
—
—
—
50
50
2
85
50
50
2
85
mV p-p
mV
30
—
50
30
—
50
85
85
V
=
—
—
20
20
In
19 tO 40
10
—
25
10
—
25
100
5
200
20
100
5
200
20
3
nO lOaD
tO Full
—
—
mV
25
50
25
50
480
600
300
450
Dual
4
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
CROss
MaIn +pO = 33 w
Dual
5
REgulatIOn
+pO = 3 w tO 27 w
-pO = 27 w tO 3 w
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.3
5.4
6.0
9.0
—
—
2.3
5.0
5.0
7.0
MaIn +pO = 3 w tO 30 w
Dual
±pO = 15 w
Input VOltagE
Input CuRREnt
19
—
—
28
75
30
40 19
28
75
30
40 19
28
60
40 19
28
60
40
110
35
VꢂC
mA
nO lOaD
InhIbItED
90
35
—
—
90
35
—
—
110
—
—
30
35
30
Input RIpplE
CuRREnt
Full lOaD
bw ≤ 10 ꢀHz
—
80
—
15
83
15
40
—
—
80
—
15
83
15
40
—
—
80
—
15
84
6
40
—
—
80
—
15
84
6
40
—
mA p-p
%
EFFICIEnCy
staRtup DElay
25
25
10
10
ms
Notes
1.ꢁn dual output models the maximum combined output power is 70 watts.
A maximum of 95% (66.5 W) is available from any single output.
4.
Regulationꢀeffectꢀonꢀtheꢀnegativeꢀdualꢀoutputꢀduringꢀtheꢀdefinedꢀ
conditions.
2.ꢁn triple output models the maximum combined output power is 60 watts. 5.
A maximum of 50 watts is available from a single output.
3.Balanced loads
Regulationꢀeffectꢀonꢀbothꢀdualꢀoutputsꢀduringꢀtheꢀdefinedꢀconditions.ꢀ
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Page 3 of 7
ꢁFꢂꢀRevꢀFꢀ20100212
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
tHerꢌaL ꢌanaꢍeꢌent
CalCulatIng MaXIMuM aMbIEnt tEMpERatuRE
The ꢀFW Series of ꢂC/ꢂC 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 dissi-
From Figure 1 we can see that the maximum allowed ambient temper-
ature is approximately 75°C.
hEat sInk RECOMMEnDatIOns
An ꢀFW 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 recom-
mended 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 calcula-
tions 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.
pation (P
vs. ambient temperature for various heat sink thermal
ꢂISS
resistances. P
may be calculated as:
ꢂISS
P
= P / efficiency – P
ꢁUT ꢁUT
ꢂISS
The efficiency for all combinations of PꢁUT and VIN for the various
models may be obtained from the graphs on the preceding pages.
Example:Converter = ꢀFW2815ꢂ, T
= 70°C,
AꢀB
V
= 28 VꢂC, P
= 45 watts
IN
ꢁUT
Efficiency = 85% (From Figure 7)
= (45 / 85) – 45 = 7.95 watts
P
ꢂISS
From Figure 1 we can see that this situation will require thermal resis-
tance 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 = ꢀFW2805S, VIN = 28 VꢂC, P
= 45 W.
ꢁUT
ꢀ
ꢅhermalꢀResistanceꢀ=ꢀ3°Cꢀ/ꢀwatt.
Efficiency = 83.5% (From Figure 3)
P
= (45 / 0.835) – 45 = 8.89 watts.
ꢂISS
pin Out
pꢀꢁ dꢂꢃꢄ Oꢂꢅꢆꢂꢅ
tꢇꢀꢆꢄꢈ Oꢂꢅꢆꢂꢅ
Positive Input
Case Ground
Input Common
Inhibit/Sync In
Neg. Aux. ꢁutput
Positive Aux. ꢁutput
ꢁutput Common
ꢀain (+5) ꢁutput
20
15
10
5
1
2
3
4
5
6
Positive Input
Case Ground
Input Common
Inhibit/Sync In
Negative ꢁutput
Positive ꢁutput
7, 8 ꢁutput Common
9, 10 No Connection
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
8
5
10
6
FIGuRE 2: PIN OuT
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Page 4 of 7
ꢁFꢂꢀRevꢀFꢀ20100212
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
Typical Performance Curves: 25°C Tc , 28 VꢂC Vin, 100% load, free run, unless otherwise specified.
87
85
83
81
79
77
75
73
71
87
85
83
81
79
77
75
73
71
87
85
83
81
79
77
75
73
71
19 V
19 V
19 V
28 V
28 V
28 V
40 V
40 V
40 V
60 70
10
20
30
40
50
10
20
30
40
50
60
70
10
20
30
40
50
60
70
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
MFW2812D Efficiency vs Line & Load
MFW2815D Efficiency vs Line & Load
MFW28512T Efficiency vs Line & Load
FIguRE 3
FIguRE 4
FIguRE 5
19
87
MFW2815D
19 V
18
2815S
85
83
81
MFW2812D
18
283R5S
17
17
28 V
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 Dual and Triple Output Models
Low Line Dropout vs. Load (50 mV drop)
MFW Single Output Models
MFW28515T Efficiency vs Line & Load
FIguRE 8
FIguRE 7
FIguRE 6
mOdel numbering key
MFW 28 512 T / ES
Base Model
Input Voltage
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.)
www.interpoint.com
Page 5 of 7
ꢁFꢂꢀRevꢀFꢀ20100212
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
CASE L
Squared corner indicates pin one
Solder Seal
3.20 max (81.3)
2.850 (72.39)
0.141
dia. x 6
(3.58)
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
Case dimensions in inches (mm)
Tolerance 0.005 (0.13) for tꢀree decimal places
0.01 (0.3) for tꢁo decimal places
unless otꢀerꢁise specified
CAUTION
Heat from refloꢁ or ꢁave soldering may damage tꢀe device.
Solder pins individually ꢁitꢀ ꢀeat 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 ꢁitꢀ copper core pins 5-8, ceramic seal
Case L, Rev C, 20060803
Please refer to tꢀe numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves tꢀe rigꢀt to make
cꢀanges in products or specifications ꢁitꢀout notice.
Copyrigꢀt © 1999-2006 Interpoint Corp. All rigꢀts reserved.
FIguRE 9: CasE l
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Page 6 of 7
ꢁFꢂꢀRevꢀFꢀ20100212
ꢁFꢂꢀSꢃRIꢃSꢀ
DC/DC COnVERtERs
70 WATT
ST A N D A R D A N D /ES (N O N -QML) PR O D U C T S
1
EN V I R O N M E N T A L SC R E E N I N G
test perFOrmed
standard
nOn-Qml2
/es
nOn-Qml2
Pre-cap Inspection
Method 2017, 2032
yes
no
yes
yes
yes
Temperature Cycle (10 times)
Method 1010, Cond. B, -55°C to +125°C, ambient
Constant Acceleration
Method 2001, 500 g
no
Burn-in
Method 1015
3
96 hours
no
yes
yes
Final Electrical Test MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case
yes
Hermeticity Test
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10 )
no
no
yes
yes
yes
no
-3
Final visual inspection
Method 2009
yes
yes
ꢅestꢀmethodsꢀareꢀreferencedꢀtoꢀꢁIL-SꢅD-883ꢀasꢀdeterminedꢀbyꢀꢁIL-PRF-38534.
Notes:
1. rꢄfꢄꢅꢊ ꢁꢃ ꢂꢅꢃꢇꢀꢋꢁꢊ ꢁhꢆꢁ ꢇꢃ ꢉꢃꢁ ꢃffꢄꢅ QꢌL ꢊꢋꢅꢄꢄꢉꢈꢉg.
2.ꢀStandardꢀandꢀ/ꢃS,ꢀnon-QꢁLꢀproducts,ꢀdoꢀnotꢀmeetꢀallꢀofꢀtheꢀrequirementsꢀofꢀꢁIL-PRF-38534.
3. Burn-in designed to bring the case temperature to the maximum case temperature of 85°C.
ꢁFꢂꢀSeriesꢀDC/DCꢀConverters,ꢀꢁFꢂꢀRevꢀFꢀ20100212.ꢀꢅhisꢀrevisionꢀsupersedesꢀallꢀpreviousꢀreleases.ꢀAllꢀtechnicalꢀinformationꢀisꢀbelievedꢀtoꢀbeꢀ
accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without
notice. ꢀFW Series is a trademark of Interpoint. Copyright © 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com
Page 7 of 7
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