Crane MSR28512T Dc/dc converters 28 volt input Datasheet

FEATURES
•
•
•
•
•
•
•
•
•
•
•
–55°C to +85°C operation
16 to 32 VDC input
Fully isolated
Opto-coupler feedback
Switching frequency
Single and dual outputs
typical 80 kHz, variable freq.
Triple output - 200 kHz, fixed
Topology – Flyback
40 V for 50 ms transient protection
Inhibit function
Indefinite short circuit protection
Up to 70% efficiency
External capacitors required
MSR SERIES
4 WATT
DC/DC CONVERTERS
28 VOLT INPUT
MODELS
VDC OUTPUT
SINGLE
DUAL
TRIPLE
5
±12
+5 & ±12
±15
+5 & ±15
Size (max.): 1.075 x 1.075 x 0.370 inches (27.31 x 27.31 x 9.40 mm).
See Section B8, case C2, for dimensions.
Weight:
20 grams maximum.
Screening: Standard or ES.See Section C2 for screening options,
see Section A5 for ordering information.
DESCRIPTION
The MSR Series™ DC/DC converters provide the high efficiencies
associated with switching regulators, yet have full isolation between
input and output. Interpoint builds the MSR converters using thickfilm hybrid technology and seals them in metal packages for military,
aerospace, and other high-reliability applications. The solder sealed
packages of the standard models pass a dip gross leak hermeticity
test. Environmentally screened models pass a fine leak hermeticity
test. See Section C2 for a complete list of screening options.
CONVERTER DESIGN
A footprint of just over one square inch makes the MSR Series
DC/DC converters one of Interpoint’s smallest converters. These
converters incorporate a flyback topology which requires a minimum
of components resulting in small package size. Single and dual
models self-oscillate at an operating frequency which is an approximate inverse function of the load. At full load, the frequency is typically 80 kHz for single and dual output models. Triple output models
operate at a fixed frequency of approximately 200 kHz. A transformer in the forward power circuit and an opto-coupler in the feedback/control loop maintain input to output isolation.
CONVERTER OPERATION
MSR Series DC/DC converters feature an input voltage range of 16
to 32 VDC and can withstand a transient of up to 40 V for up to 50
msec. They offer a choice of five different output voltage (VDC)
configurations: +5 , ±12 , ±15, +5 main with ±12 auxiliaries, and +5
main with ±15 auxiliaries. Dual output models deliver up to 4 watts
for either balanced or unbalanced loads, however, at least 25% of
the total load should be on the positive output. The single output
model supplies up to 3.5 watts of output power while the triple output
models supply up to 3.2 watts. The high efficiency remains almost
constant over the entire input voltage range and from approximately
25% of full load to full load. This makes the MSR Series converters
ideal for either battery or aircraft power applications.
INHIBIT FUNCTION
The open collector TTL compatible inhibit terminal is referenced to
input common. Inhibiting the converter by pulling the inhibit terminal
(pin 15) low results in an input current as low as 2 mA for the
MSR2805S. The inhibit terminal has an open circuit voltage of 12
to 28 V.
SHORT CIRCUIT PROTECTION
Each output has current limiting circuitry for indefinite short circuit
protection providing that the case temperature does not exceed the
specified limits. Under short circuit conditions the input current is
reduced to less than full load input current and the output short
circuit current remains higher than full load output current.
MINIMAL HEAT SINKING
The MSR Series converters’ high efficiency minimizes heat sinking
requirements, but care should be taken to remove self-generated
heat to prevent exceeding the maximum case temperature. Heat
conducting material (PCB, copper sheet, heat sink, etc.) in contact
with the converter’s baseplate can help to increase heat dissipation.
The converter can be operated at full load at a case temperature of
85°C, with the output power derated linearly to zero at 115°C.
WARNING: EXTERNAL CAPACITORS REQUIRED
External capacitors are required on the outputs. Operating the unit
without external capacitors will result in damage to the internal
circuitry. Minimum recommended capacitor values are given in
Tables 1 and 2. For optimum performance, low ESR (Equivalent
Series Resistance) solid tantalum capacitors are required. The
specifications on the following pages are based on the use of highquality solid tantalums. Operation with different types of capacitors
will seriously affect performance.
B4-27
MSR SERIES
4 WATT
DC/DC CONVERTERS
TYPICAL CHARACTERISTICS
INHIBIT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 32 VDC
Output Power
• 3.2 to 4 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –-65°C to +150°C
Output Voltage Temperature Coefficient
• MSR2805S 100 ppm/°C typ, 200 max.
• MSR28XXD 50 ppm/°C typ
• MSR285XXT 100 ppm/°C typ
Input to Output Capacitance
• 60 pF typical
Isolation
• 100 megohm minimum at 500 V
Conversion Frequency
• Single and dual output models, 80 kHz at
full load typical, variable frequency
• Triple output models, 200 kHz typical
fixed frequency
Inhibit Pin Voltage (unit enabled)
• 12 to 28 V
Inhibit TTL Open Collector
• Logic low (output disabled) ≤ 0.8 V
• Referenced to input common
• Logic high (output enabled) ≥ 12 V
Open collector
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 32 VDC continuous
• 40 V for 50 msec transient
Case Operating Temperature (Tc)
• –55°C to +85°C full power
• –55°C to +115°C absolute
Derating Output Power/Current
• Linearly from 100% at 85°C to 0% at 115°C
WARNING: EXTERNAL CAPACITORS REQUIRED
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE AND DUAL OUTPUT MODELS
PARAMETER1
MSR2805S
CONDITIONS
MSR2812D
MSR2815D
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
4.90
5.0
5.10
±11.88
±12
±12.12
±14.85
±15
±15.15
VDC
16 TO 32 VIN
—
—
700
—
—
±167
—
—
±133
mA
OUTPUT POWER
Tc = –55°C TO +85°C
—
—
3.5
—
—
4.0
—
—
4.0
W
OUTPUT RIPPLE
BW = DC TO 1 MHz
—
75
150
—
75
150
—
75
150
mV p-p
LINE REGULATION
16 TO 32 VIN
—
5
10
—
10
20
—
10
20
mV
LOAD REGULATION
NO LOAD TO FULL
—
25
50
—
12
24
—
12
24
mV
Tc = –55°C TO +85°C
16
28
32
16
28
32
16
28
32
VDC
TRANSIENT 50 ms
—
—
40
—
—
40
—
—
40
V
NO LOAD
—
7
10
—
10
15
—
10
15
OUTPUT VOLTAGE
OUTPUT CURRENT
INPUT VOLTAGE
INPUT CURRENT
FULL LOAD
—
—
192
—
—
213
—
—
213
INHIBITED
—
—
2
—
—
15
—
—
15
65
70
—
67
70
—
67
70
—
EFFICIENCY
Notes
1. External capacitors required to prevent damage to internal circuitry (see
Table 1 for specifications).
mA
%
2. Dual output models deliver up to 4 watts total for balanced or unbalanced
loads, however, the positive output should carry at least 25% of the total load.
SINGLE AND DUAL OUTPUT EXTERNAL CAPACITORS
OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY.
TABLE 1: EXTERNAL CAPACITOR REQUIREMENTS
Required
Connection
Positive Output (12 & 13) to
Output Common (8 & 9)
Positive Output (10) to
Dual Outputs2
Output Common (8)
MSR2812D
External Capacitor (14) to
and
Output Common (8)3
MSR2815D
Negative Output (12) to
Output Common (8)
Model
Single Output
MSR2805S
Minimum
Capacitor Value1
220 µF, 10 V
100 µF, 25 V
INHIBIT
15
100 µF, 25 V
17, 18
10 µF, 25 V
Notes – Table 1
1. Capacitors should be high quality, low ESR components —
solid tantalum is recommended.
2. See Figure 1 for connection diagram
3. Place positive side of capacitor toward pin 8.
B4-28
FEEDBACK
POSITIVE
INPUT
1, 2
INPUT
COMMON
POSITIVE
OUTPUT
10
LOGIC
OUTPUT
COMMON
8
TIMING
CONTROL
SWITCH
+
+
VOLTAGE
REGULATOR
NEGATIVE
OUTPUT
12
EXTERNAL
CAPACITORS
100µF
10µF
+
100µF
14
EXTERNAL
CAPACITOR
TERMINAL
FIGURE 1: DUAL OUTPUT EXTERNAL CAPACITOR CONNECTIONS
MSR SERIES
4 WATT
DC/DC CONVERTERS
WARNING: EXTERNAL CAPACITORS REQUIRED
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
TRIPLE OUTPUT MODELS
PARAMETER
MSR28512T
CONDITIONS
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
MAX
MIN
TYP
MAX
5.0
5.1
MAIN
4.9
5.0
5.1
4.9
BALANCED LOAD
AUX
±11.5
±12.0
±12.5
±14.5
MAIN
10.01
—
400
10.01
—
400
AUX
—
—
±50.0
—
—
±40.0
OUTPUT CURRENT
OUTPUT RIPPLE3
TYP
16 TO 32 VIN
OUTPUT VOLTAGE
OUTPUT POWER2
MSR28515T
MIN
Tc = –55°C TO +85°C
UNITS
VDC
±15.0 ±15.5
mA
—
—
3.2
—
—
3.2
—
50
100
—
50
100
± AUX
—
50
100
—
50
100
MAIN
—
5
10
—
5
10
± AUX
—
3
6
—
3
7.5
MAIN
—
15
30
—
15
30
± AUX
—
15
30
—
15
30
Tc = –55°C TO +85°C
16
28
32
16
28
32
VDC
TRANSIENT 50 ms
—
—
40
—
—
40
V
NO LOAD
—
10
20
—
10
20
MAIN
BW DC TO 1 MHz
16 TO 32 VIN
NO LOAD TO FULL
INPUT CURRENT
FULL LOAD
—
—
176
—
—
176
INHIBITED
—
—
5
—
—
5
65
70
—
65
70
—
EFFICIENCY
W
mV p-p
mV
mV
mA
%
Notes
1. External capacitors required (see Table 2 for specifications).
2. Minimum load required on main output for full power auxiliary operation.
TRIPLE OUTPUT EXTERNAL CAPACITOR
OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY.
TABLE 2: EXTERNAL CAPACITOR REQUIREMENTS
Model
MSR28512T
and
MSR28515T
Required
Connection1
Positive 5 VDC Output (9) to
Output Common (6 or 7)
Minimum
Capacitor Value2
220 µF, 10 V
Notes – Table 2
1. See Figure 2 for connection diagram.
2. Capacitors should be high quality, low ESR components —
solid tantalum is recommended.
FEEDBACK
POSITIVE
INPUT
1, 2
INHIBIT
15
INPUT
COMMON
17, 18
+5 OUTPUT
9
LOGIC
TIMING
CONTROL
SWITCH
REF. &
COMP
DUAL
TRACKING
REGULATOR
OUTPUT
COMMON
6, 7
8
POSITIVE
AUXILIARY
OUTPUT
220µF
EXTERNAL
CAPACITOR
5
NEGATIVE
AUXILIARY
OUTPUT
FIGURE 2:
TRIPLE OUTPUT EXTERNAL CAPACITOR CONNECTIONS
B4-29
MSR SERIES
4 WATT
DC/DC CONVERTERS
WARNING: EXTERNAL CAPACITORS REQUIRED
OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY.
PIN OUT
Pin
Single Output
Dual Output
1, 21
Positive Input
Positive Input
Positive Input
Triple Output
3
No connection
No connection
No connection
4
Case
Case
Case
5
No connection
No connection
Negative Aux. Output
6
No connection
No Connection
Output Common Main2
7
No connection
No connection
Output Common Aux.2
8
Output Common3
Output Common
Positive Aux. Output
9
Output Common3
No connection
+5 VDC Output
10
No connection
Positive Output
No connection
11
No connection
No connection
No connection
12
Positive Output3
Negative Output
No connection
13
Positive Output3
No connection
No connection
14
No connection
Ext. Capacitor
No connection
15
Inhibit
Inhibit
Inhibit
16
No connection
No connection
No connection
17, 181
Input Common
Input Common
Input Common
Dot on top of cover
indicates pin one.
FIGURE 3: PIN OUT
28 512 T / ES
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.)
B4-30
10
See section B8, case C2, for dimensions.
MODEL NUMBERING KEY
MSR
9
BOTTOM VIEW
MSR
18 17
Pin Out Notes
1. Make external connection to both pins on all models.
Pins 1 and 2 positive input
Pins 17 and 18 input common
2. Pins 6 and 7 on triple output models are connected internally.
3. On the HR41-2805:
Make external connections to both output common pins (8 and 9).
Make external connections to both positive output pins (12 and 13).
Base Model
Input Voltage
1 2
24021-001-DTS Rev A
DQ# 1022
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. MSR Series is a trademark of Interpoint.
Copyright © 1992 - 1999 Interpoint. All rights reserved.
CASES
CASE C
BOTTOM VIEW CASE C1
MSA Series: Screening – Standard, ES, or 883
SMSA Series: Screening – Space Standard, H, or K
Dot on top of case
indicates pin one
Projection Weld
Seam Seal
0.932
(23.67)
1.075 max
(27.31)
FIGURE 8: CASE C
MAXIMUM DIMENSIONS
2
3
4
5
0.932 (23.67)
6
0.732 (18.59)
0.332 (8.43)
0.000
0.000
0.205 ±0.010
(5.21 ±0.25)
0.270 max.
(6.86)
0.000
0.205 ±0.010
(5.21 ±0.25)
0.270 max.
(6.86)
FIGURE 9:
CASE C1
7
0.532 (13.51)
8
0.132
(3.35)
0.000
BOTTOM VIEW CASE C2
MSR Series: Screening – Standard or ES
HR40 Series: No screening options
0.018 ±0.002 dia.
(0.46 ±0.05)
Dot on top of case
indicates pin one
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 2
9
18 17
10
0.205 ±0.010
(5.21 ±0.25)
FIGURE 10:
CASE C2
0.000
0.800 (20.32
0.370 max.
(9.40)
0.350 (8.89)
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.
1
0.025
(0.64)
dia.
1.075 max
(27.31)
Materials
Header Case C1
Cold Rolled Steel/Nickel/Gold
Cases C2 and C3
Kovar/Nickel/Tin
Cover Case C1
Cold Rolled Steel/Nickel
Cases C2 and C3
Kovar/Nickel/Tin
Pins
Case C1
Copper/Nickel/Gold
Cases C2 and C3
Kovar/Nickel/Gold,
matched glass seal
Squared corner and dot on
top of case indicate pin one.
0.132 (3.35)
CASE C
BOTTOM VIEW
See Figures 9 - 11
for pin configurations.
0.100 (2.54)
Pins equally
spaced
Marker bead
on pin 18
0.800 (20.32)
BOTTOM VIEW CASE C3
MSF EMI Filter: Screening – Standard or ES
Seam Seal
0.018 ±0.002 dia.
(0.46 ±0.05)
Dot on top of case
indicates pin one
1 2
3 4
0.800 (20.32
B8-8
0.300
(7.62)
0.100 (2.54)
0.000
0.205 ±0.010
(5.21 ±0.25)
0.370 max.
(9.40)
0.350 (8.89)
0.000
7
0.800 0.600
(20.32) (15.24)
FIGURE 11:
CASE C3
0.205 ±0.010
(5.21 ±0.25)
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.
0.365 max.
(9.27)
9 8
6 5
QA SCREENING
85°C PRODUCTS
85°C PRODUCTS
TEST (85°C Products excluding HR products)
STANDARD
/ES
yes
yes
no
yes
no
yes
no
yes
yes
yes
Fine Leak, Method 1014, Cond. A
no
yes
Gross Leak, Method 1014, Cond. C
no
yes
Gross Leak, Dip (1 x 10-3)
yes
no
yes
yes
PRE-CAP INSPECTION
Method 2017
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. B, -55°C to 125°C
CONSTANT ACCELERATION
Method 2001, 500 g
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
FINAL VISUAL INSPECTION
Method 2009
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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