MTW2805S [CRANE]
DC/DC CONVERTERS 28 VOLT INPUT; DC / DC转换器， 28伏特的输入
| 型号： | MTW2805S |
| 厂家： | 
Crane Aerospace & Electronics. |
| 描述： | DC/DC CONVERTERS 28 VOLT INPUT |
| 文件： | 总7页 (文件大小：95K) |
| 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
MTW SERIES
30 WATT
DC/DC CONVERTERS
28 VOLT NPUT
• 18 to 40 VDC input
(19 to 40 VDC MTW2805S)
• Fully Isolated
I
MODELS
VDC OUTPUT
• Optocoupler feedback
• Fixed frequency
• Topology – Push-Pull Forward
• 50 V for up to 50 ms transient protection
• Inhibit function
SINGLE
DUAL
±12
±15
5
12
15
• Indefinite short circuit protection
• Remote sense on MTW2805S model
• Up to 86% efficiency
Size (max.): 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)
See Section B8, case J5, for dimensions.
Weight:
60 grams max.
Screening: Standard or ES. See Section C2 for screening options,
see Section A5 for ordering information.
DESCRIPTION
An inhibit is provided to allow power shut-down and start-up from a
logic input. An open circuit on the inhibit pin allows normal operation,
while a connection between the inhibit pin and input common
disables the internal oscillator and shuts down the output. In the
inhibit mode, approximately 1 mA must be sunk from pin the inhibit
pin. An open collector, active low, is required to activate the inhibit
function.
The MTW Series™ of DC/DC converters offer the high efficiency
and wide input voltage range of switching regulators with the isola-
tion, excellent output regulation, and low output noise typical of
linear regulators without requiring the use of external components.
MTW converters are built using thick-film hybrid technology and are
sealed in metal packages for military, aerospace and other high-reli-
ability applications. Unscreened models are sealed with solder and
are guaranteed to pass a gross leak test (maximum leak rate of 1 x
-3
All MTW converters are characterized by close output regulation
over the entire operating range with no minimum power require-
ment. On 12 and 15 VDC output models, typical line regulation is 10
to 20 mv. The MTW2805S model uses external remote sense pins
which monitor the voltage at the load to provide typical regulation in
the 5 to 7 mV range. The voltage sensing circuitry operates in a true
four terminal voltage mode, eliminating the adverse effects of line
resistance voltage drops. The remote sense pins may be left uncon-
nected, but see cautions in on the following pages. For normal oper-
ation, remote sense pins should be connected to their respective
output pins.
10 atm.-cc/sec). Environmentally screened models (/ES) are
hermetically sealed with solder and will pass a fine leak and gross
leak test as described in Section C2.
MTW converters use a constant frequency pulse-width modulated
switching regulator design operating in the forward mode with a
clock switching frequency of 240 to 300 kHz. Isolation is achieved
through the use of a transformer in the forward power circuit and an
optocoupler in the feedback control loop. The full load output power
of 30 watts is available over the entire 18 to 40 VDC (19 to 40 VDC
for MTW2805S) input range. On dual output models, up to 90% of
full power is available from either output up to a combined total of 30
watts. Input transients of 50 V to up to 50 ms. duration will not impair
normal operation.
The MTW Series offers low noise on both the input and output line.
in the single output converters, two-section L-C filters at both the
input and output limit output ripple voltage and minimize reflected
ripple on the input line. A small value (1000 pF, 500 V) ceramic
capacitor connected between the case and input common pin of the
single volt output models will reduce EMI on the input lines to levels
near those required by MIL-STD-461C’s CE03 standard. In the dual
output converters, single-section L-C filters are used at the input
and outputs. If compliance with MIL-STD-461 is necessary, use of
Interpoint’s FMA-416 EMI filter or FM-704A transient suppressor is
recommended.
Efficiency is high over the entire input voltage range and from
approximately 25% of full load to full load (see typical efficiency
curves).
MTW converters are provided with indefinite short circuit protection
through the use of current limiting techniques. When the output
current reaches approximately 125% of the full rated load, the
output voltage begins to reduce to protect the converter. The
converter can sustain a true short circuit condition indefinitely.
With temperatures measured at the baseplate, the MTW Series is
rated for full power operation from –55°C to +85°C with the power
derated linearly to 0 at 115°C. The MTW’s flanged case facilitates
removal of heat and provides for mechanically secure mounting.In
applications requiring full power operation, an efficient heat sink
attached to the baseplate is required.
B4-9
MTW SERIES
30 WATT
DC/DC CONVERTERS
TYPICAL CHARACTERISTICS
INHIBIT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Inhibit TTL Open Collector
• Logic low (output disabled)
Inhibit pin current 1 mA typical
• Referenced to input common
• Logic high (output enabled)
Open collector
Output Voltage Temperature Coefficient
• 100 ppm/°C, typical
• 18 to 40 VDC (19 to 40 VDC MTW2805S)
Output Power
• 30 watts
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –55°C to +125°C
Input to Output Capacitance
• 80 pF typical single output models
• 70 pF typical MTW2812D
• 60 pF typical MTW2815D
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Conversion Frequency
• 240 to 300 kHz
Inhibit Pin Voltage (unit enabled)
• 11 to 15 V single output models
• 8 to 12 V MTW2812D
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 18 to 40 VDC continuous (19 to 40 MTW2805S)
• 50 V for 50 msec transient
Case Operating Temperature (Tc)
• –55°C to +85°C full power
• –55°C to +115°C absolute
• 10 to 14 V MTW2815D
Derating Output Power/Current
• Linearly from 100% at 85°C to 0% at 115° C
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
MTW2805S
MTW2812S
TYP MAX
12.0 12.12
MTW2815S
TYP MAX
15.0 15.15
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
CONDITIONS
MIN
4.95
—
TYP
5.0
—
—
30
7
MAX
MIN
11.88
—
MIN
14.85
—
UNITS
VDC
A
5.05
6.0
30.0
50
—
—
30
10
10
28
—
20
—
—
2.5
30.0
65
—
—
30
10
10
28
—
20
—
—
2.0
30.0
65
–55°C TO +85°C
BW ≤ 2 MHz
—
—
—
W
—
—
—
mV p-p
mV
1
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
–55°C TO +85°C
MIN. TO MAX. V
—
20
—
25
—
25
IN
1
NO LOAD TO FULL
NO LOAD TO FULL
TRANSIENT 50 ms
NO LOAD
—
5
20
—
20
—
20
mV
19
—
28
—
15
—
—
40
18
—
40
18
40
VDC
mA
50
50
—
50
INPUT CURRENT
—
20
—
35
—
35
FULL LOAD
—
1370
15
—
1400
22
—
1400
22
INHIBITED
—
—
—
INPUT RIPPLE
CURRENT
BW ≤ 2 MHz
—
80
—
—
5
10
—
—
—
—
82
—
—
10
84
20
—
—
—
—
84
—
—
10
86
20
—
—
—
mA p-p
%
EFFICIENCY
START-UP
82
2
DELAY
15
30
40
ms
OVERSHOOT
300
400
400
mV
Notes
1. For MTW2805S, with the remote sense pins connected to the load and no resistance between the output pins and load.
2. A low output impedance power source is required on the input to realize this start-up time. If less than full surge current is available, start-up time
will be longer
CAUTION
Permanent damage to the MTW2805S will result if pin 6 is shorted to ground. Damage may also result if pin 4 or pin 5 is disconnected from the load
during operation with the remote sense leads connected to the load. If remote sense pins are not connected to the load, the output voltage of the
MTW2805S will rise to approximately 6.2 VDC measured across pins 4 and 5.
B4-10
MTW SERIES
30 WATT
DC/DC CONVERTERS
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
MTW2812D
TYP
MTW2815D
TYP
PARAMETER
CONDITION
MIN
11.88
11.88
—
MAX
12.12
12.12
2.5
MIN
14.85
14.85
—
MAX
15.15
15.15
2.0
UNITS
OUTPUT VOLTAGE
+V
12.0
12.0
—
15.0
15.0
—
OUT
VDC
– V
OUT
OUTPUT CURRENT
A
1
OUTPUT POWER
–55°C to +85°C
—
—
30.0
—
—
30.0
W
OUTPUT RIPPLE
VOLTAGE
BW ≤ 2 MHz
—
—
—
—
—
18
—
50
10
20
2.5
2.5
28
—
85
25
50
3.5
3.5
40
50
—
—
—
—
—
18
—
50
10
20
2.2
2.2
28
—
85
25
50
3.2
3.2
40
50
mV p-p
mV
LINE REGULATION
LOAD REGULATION
CROSS REGULATION
V
= 18 TO 40
IN
NO LOAD TO FULL
mV
2
+V
OUT
%
– V
OUT
INPUT VOLTAGE
–55°C to +85°C
INPUT CURRENT
CONTINUOUS
VDC
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
—
—
—
35
—
—
50
1350
24
—
—
—
45
—
—
60
1400
24
mA
INPUT RIPPLE
CURRENT
BW ≤ 2 MHz
—
81
—
—
15
84
50
—
—
—
—
82
—
—
15
85
50
—
—
—
mA p-p
%
EFFICIENCY
START-UP
3
DELAY
30
30
ms
OVERSHOOT
500
500
mV
Notes
1. Up to 90% of full power is available from either output providing the total power does not exceed 30 watts.
2. The effect on the output voltage of either output (held at 3 watts) when the other output is varied from 3 to 27 watts.
3. A low output impedance power source is required on the input to realize this start-up time. If less than full surge
current is available, start-up time will be longer
PIN OUT
Squared corner and dot on
top of cover indicate pin one.
Pin
1
MTW2805S
Positive Input
Inhibit
Single Output
Positive Input
Inhibit
Dual Output
Positive Input
No connection
Positive Output
2
3
Sense Return
No connection
1
2
3
4
5
6
4
Output Common Output Common Output Common
5
Positive Output
Positive Sense
Case Ground
No connection
No connection
Input Common
Positive Output
No connection
Case Ground
No connection
No connection
Input Common
Negative Output
No connection
Case Ground
Inhibit
BOTTOM VIEW
MTW
See section B8, case J5, for dimensions.
6
7
8
10
9
8
7
9
Input Common
Input Common
10
FIGURE 1: PIN OUT
B4-11
MTW SERIES
30 WATT
DC/DC CONVERTERS
MODEL NUMBERING KEY
MTW 28 12 D / ES
Base Model
Voltage In
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
Typical Performance Curves: 25°C Tc
88
86
88
88
86
84
82
80
78
76
74
72
70
68
18 V
86
84
82
80
78
76
74
72
70
68
19 V
84
82
80
78
76
74
72
70
68
18 V
28 V
28 V
28 V
40 V
40 V
40 V
5
10 15 20 25 30
Output Power (Watts)
5
10 15 20 25 30
Output Power (Watts)
5
10 15 20 25 30
Output Power (Watts)
MTW2812D Efficiency
MTW2805S Efficiency
MTW2812S Efficiency
FIGURE 2
FIGURE 3
FIGURE 4
88
18
17
16
18
18 V
86
84
82
80
78
76
74
72
70
68
28 V
17
16
15
MTW2815D
MTW2812S
MTW2815S
MTW2812D
40 V
15
14
14
5
10 15 20 25 30
5
10 15 20 25 30
Output Power (Watts)
5
10 15 20 25 30
Output Power (Watts)
Output Power (Watts)
MTW2815D Efficiency
MTW2812S and MTW2815S
Low Line Dropout
MTW2812D and MTW2815D
Low Line Dropout
FIGURE 5
FIGURE 6
FIGURE 7
24421-001-DTS Rev A
DQ# 1017
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. MTW Series is a trademark of Interpoint.
Copyright © 1994 - 1999 Interpoint. All rights reserved.
B4-12
CASE J
CASES
Dot on top of case indicates pin one
CASE J
BOTTOM VIEW
See Figures 36 - 40
for pin configuration
1.350 max
(34.29)
2.720 max
(69.09)
Flange Thickness:
Cases J1 and J5
Case J2
0.060 (1.52)
0.073 (1.85) max
Cases J3 and J4
0.067 +0.005/-0.007 (1.70 +0.13/-0.8)
Materials
Header Case J1
Cold Rolled Steel/Nickel/Gold
Cases J2 - J5
Cold Rolled Steel/Nickel/Tin
Cover Case J1
Kovar/Nickel
Case J2 - J5
Cold Rolled Steel/Nickel/Tin
#52 alloy (all cases)
Pins
Case J1
MHV Series Triple – compression glass seal
MTR Series Triple – ceramic seal
Cases J2 - J5
compression glass 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 35: CASE J MAXIMUM DIMENSIONS
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.
B8-22
CASE J
CASES
BOTTOM VIEW CASE J4
Flanged cases: Designator required in Case Option position of model number.
FMD28-461 EMI Filter (down-leaded): Screening – Standard or ES
Squared corner and dot on top
of case indicate pin one.
Solder Seal
1.173
(29.79
1
2
3
0.040 dia.
(1.02)
0.162 dia
(4.11)
0.673
(17.09)
Solder Tip-off
5
4
0.173
(4.39)
0.000
FIGURE 39: CASE J4
BOTTOM VIEW CASE J5
Flanged cases: Designator required in Case Option position of model number
for MHL Series and MTO Series only.
MHL Series, MTO Series, MTW Series: Screening – Standard or ES
HR300 Series: no screening options
Squared corner and dot on top
of case indicate pin one.
Solder Seal
1.173
(29.79
1
2
9
3
8
4
7
5
6
0.040 dia.
(1.02)
0.162 dia
(4.11)
0.673
(17.09)
Solder Tip-off
10
0.173
(4.39)
0.000
FIGURE 40: CASE J5
B8-25
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
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