LS2802R5S/EM [INFINEON]
HIGH RELIABILITY DC/DC CONVERTER; 高可靠性DC / DC转换器
| 型号： | LS2802R5S/EM |
| 厂家： | 
Infineon |
| 描述： | HIGH RELIABILITY DC/DC CONVERTER |
| 文件： | 总16页 (文件大小：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PD-96964A
LS-SERIES
28V Input, Single/Dual Output
HYBRID - HIGH RELIABILITY
RADIATION HARDENED
DC/DC CONVERTER
Description
The LS-Series of DC/DC converters are, high reliability
devices designed for hostile radiation hardened
environments. The LS-Series provide up to 30 watts
output power, small size, low weight, integrated EMI
filtering and a high tolerance to environmental stresses
such as radiation, temperature extremes, mechanical
shock, and vibration. All components are fully de-rated
to meet the requirements of MIL-STD-975. Extensive
documentation including, thermal analysis, stress
analysis and reliability predictions are available.
LS
Features
n 18 to 40V DC Input Range
n Total Ionization Dose > 100K Rad(Si)
n SEE Hardened to LET (Heavy Ions) up to
82 MeV•cm2/mg (SEU, SEL, SEGB, SEGR)
n Internal EMI filter; Converter Capable of
meeting MIL-STD-461C CE03
n Low Weight, < 80 grams
n Magnetically Coupled Feedback
n Up to 30W Output Power
The LS-Series of converters incorporate a fixed
frequency single forward topology with magnetic
feedback and an internal EMI filter. These converters
are capable of meeting the conducted emissions
requirements of MIL-STD-461C without any additional
components. All models include an external inhibit port
and have an adjustable output voltage. They are
enclosed in a hermetic 1.5" x 2.3" x 0.425" steel package
and weigh less than 80 grams. The package utilizes
rugged ceramic feed-through copper core pins and is
sealed using parallel seam welding.
n
Single and Dual Output Models Include
1.5, 2.5, 3.3, 5, 12, 15, ±5, ±12 and ±15V
n High Efficiency - to 83%
n 100MΩ @ 500VDC Isolation
n Under-Voltage Protection
n Short Circuit and Overload Protection
n Adjustable Output Voltage
n External Inhibit
The LS-Series of DC/DC converters provide same
mechanical outline, power ratings, for backward pin
compatibility, to their lower radiation tolerant counterpart
M3L and Military series ATS DC/DC converters. The
common platform design allows for similarity between
military and space system architectures. For higher
output power applications the HM, M3H and M3G-Series
of DC/DC converters are recommended.
n > 4,000,000 Hour MTBF (SF)
n Standard Microcircuit Drawings Available
Applications
n
n
n
n
n
Geo Synchronous Satellite
Low Earth Orbit
Deep Space Probe
Communication and Display Systems
Payload and Experiment LVPS
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DSCC
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Variations in electrical specifications and screening to
meet custom requirements can be accommodated.
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1
08/11/06
LS-SERIES
Circuit Description
The LS-Series converters utilize a single-ended
forward topology with resonant reset. The nominal
switching frequency is 500kHz. Electrical isolation
and tight output regulation are achieved through the
use of a magnetically coupled feedback. Voltage
feed-forward with duty factor limiting provides high
line rejection and protection against output over
voltage in the event of an internal control loop failure.
An external inhibit port is provided to control
converter operation. The converter’s operation is
inhibited when this pin is pulled low. It is intended
to be driven by an open collector logic device. The
pin may be left open for normal operation and has a
nominal open circuit voltage of 11V with respect to
the input return (pin 2).
The output voltage of all models can be adjusted
using a single external resistor.
An internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD-
461C on the input power leads.
Design Methodology
Output current is limited under any load fault
condition to approximately 125% of rated. An
overload condition causes the converter output
voltage to drop below nominal. The converter will
resume normal operation when the load current is
reduced below the current limit point. This protects
the converter from both overload and short circuit
conditions. The current limit point exhibits a slightly
negative temperature coefficient to reduce the
possibility of thermal runaway.
The LS-Series was developed using a proven
conservative design methodology derived from other
space level designs that includes selection of
established reliability components and fully de-
rating to the requirements of MIL-STD-975. A
magnetic feedback circuit is utilized instead of opto
-couplers to minimize temperature, aging and
radiation sensitivity. PSPICE was used extensively
to predict and optimize circuit performance for both
beginning and end-of-life. Thorough design
analyses include stress, thermal, and reliability
(MTBF).
2
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LS-SERIES
Absolute Maximum Ratings
Recommended Operating Conditions
Input voltage range1
Input voltage range
Output power
-0.5Vdc to +60Vdc
+4.5Vdc to +40Vdc
0 to Max. Rated
-55°C to +85°C
-55°C to +70°C
Internally limited
Output power
Lead temperature
+300°C for 10 seconds
-55°C to +125°C (Note 13)
-55°C to +135°C
Operating case temperature
Operating case temperature2
Operating case temperature
Storage temperature
1. Input voltage rating is BOL. Input voltage range reduced to
20 to 40VDC for EOL.
2. Meets de-rating per MIL-STD-975
Electrical Performance Characteristics
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Limits
Parameter
Group A
Subgroup
Unit
V
Min
18
Nom
28
Max
40
Input Voltage
Output Voltage ( Vout )
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
1
1
1
1
1
1
1
1
1
I
OUT = 100% rated load
Note 4
1.47
2.47
3.27
1.50
2.50
3.30
1.53
2.53
3.33
4.95
5.00
5.05
V
LS2812S
LS2815S
LS2805D
LS2812D
11.88
14.85
±4.95
±11.88
±14.85
12.00
15.00
±5.00
±12.00
±15.00
12.12
15.15
±5.05
±12.12
±15.15
LS2815D
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
2,3
2,3
2,3
2,3
2,3
2,3
2,3
2,3
2,3
I
OUT = 100% rated load
Notes 4, 14
1.43
2.43
3.23
1.57
2.57
3.37
V
4.90
5.10
11.76
14.70
±4.90
±11.76
±14.70
12.24
15.30
±5.10
±12.24
±15.30
Output power ( POUT
)
LS2801R5S
LS2802R5S
LS2803R3S
All Others
VIN = 18, 28, 40 Volts, Note 2
VIN = 18, 28, 40 Volts, Note 2
0
0
0
0
12
20
25
30
1,2,3
1,2,3
W
Output current ( IOUT
)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
0
0
0
0
0
0
0
0
0
8.0
8.0
7.57
6.0
2.5
2.0
4.8
2.3
1.6
A
Either Output, Note 3
Either Output, Note 3
Either Output, Note 3
Line regulation ( VRLINE
)
1,2,3
1,2,3
VIN = 18, 28, 40 Volts
OUT = 0, 50%, 100% rated, Note 4
-0.5
0.5
%
%
%
I
I
Load regulation ( VRLOAD
LS2801R5S
)
V
IN = 18, 28, 40 Volts
-2.0
-1.2
-1.0
2.0
1.2
1.0
LS2802R5S
All others
OUT = 0, 50%, 100% rated, Note 4
Cross regulation ( VRCROSS
LS2805D
)
1,2,3
V
IN = 18, 28, 40 Volts
-5.0
-3.0
-3.0
5.0
3.0
3.0
LS2812D
LS2815D
Duals only, Note 5
For Notes to Electrical Performance Characteristics, refer to page 5
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3
LS-SERIES
Electrical Performance Characteristics ( continued )
Conditions
Limits
Nom
Group A
Subgroup
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Parameter
Unit
mA
Min
Max
Input Current, no load ( IIN)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
60
60
60
70
70
70
70
100
100
1,2,3
IOUT = 0, Pin 4 open
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Pin 4 shorted to pin 2
Input current inhibited
1,2,3
1,2,3
8.0
mA
Output Ripple, ( VRIP
)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
VIN = 18, 28, 40 Volts
IOUT = 100% rated load
Notes 4, 6
35
35
35
50
70
80
80
80
80
mV p-p
Switching frequency ( FS
)
1,2,3
1,2,3
425
500
575
KHz
%
Efficiency ( EFF
)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
IOUT = 100% rated load
Note 4
61
68
72
78
78
78
79
79
79
64
72
76
82
82
82
83
83
83
Enable Input ( Inhibit Function )
open circuit voltage
drive current ( sink )
voltage range
Note 1
9.5
12
5.0
50
V
mA
V
-0.5
105
Current Limit Point
1,2,3
Vout = 90% of Nominal, Note 4
145
%
Expressed as a percentage
of full rated load current
Power dissipation, load fault (PD)
1,2,3
4,5,6
Short Circuit, Overload, Note 8
14
W
Output response to
Half Load to/from Full Load, Notes 4,9
-300
-300
300
mV pk
step load changes (VTLD
Recovery time,
)
4,5,6
Half Load to/from Full Load, Note
4,9,10
200
300
200
µs
step load changes (TTLD
)
Output response to
18V to/from 40V
IOUT = 100% rated load, Notes 1,4,11
mV pk
step line changes (VTLN
)
Recovery Time,
18V to/from 40V
IOUT = 100% rated load, Notes
1,4,10,11
µs
step line changes (TTLN
)
For Notes to Electrical Performance Characteristics, refer to page 5
4
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LS-SERIES
Electrical Performance Characteristics ( continued )
Conditions
Limits
Nom
Group A
Subgroup
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Parameter
Unit
Max
Min
Turn-on Overshoot (VOS
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
)
4,5,6
10% Load, Full Load
Notes 4,12
150
250
330
500
LS2812S
LS2815S
LS2805D
LS2812D
1000
1000
500
1000
1000
10
mV
ms
LS2815D
Turn-on Delay (TDLY
)
0
Capacitive Load (CL)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
IOUT = 100% rated load
No effect on DC performance
Notes 1, 4, 7
2500
2500
2200
1000
180
120
500
90
LS2812S
LS2815S
LS2805D
LS2812D
µF
Each output on duals
LS2815D
60
IOUT = 100% rated load
DC to 50KHz, Notes 1, 4
Line Rejection
Isolation
1
1
35
50
dB
Input to Output or Any Pin to Case
except pin 3, test @ 500VDC
100
MΩ
Device Weight
MTBF
80
g
°
4.0 x 106
Hr
MIL-HDBK-217F2, SF, 35 C
Notes for Electrical Performance Characteristics Table
1. Parameter is tested as part of design characterization or after design changes. Thereafter, parameter
shall be guaranteed to the limits specified.
2. Parameter verified during line and load regulation tests.
3. Output load current must be distributed such that at least 20% of the total load current is being provided by
one of the outputs.
4. Load current split equally between outputs on dual output models.
5. Cross regulation is measured with 20% rated load on output under test while changing the load on the
other output from 20% to 80% of rated.
6. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit
on page 6.
7. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. For
a capacitive load in excess of the maximum limit, consult the factory.
8. Overload power dissipation is defined as the device power dissipation with the load set such that VOUT
=
90% of nominal.
9. Load step transition time ≤ 10 µs.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of
its steady state value.
11. Line step transition time ≤ 100 µs.
12. Turn-on delay time from either a step application of input power or a logic low to a logic high transition on
the inhibit pin (pin 4) to the point where VOUT = 90% of nominal.
13. For operation at temperatures between +85°C and 125°C, de-rate the maximum output power linearly from
100% to 75%.
14. End of life (EOL) is ±3%
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5
LS-SERIES
Circuit for Measuring Output Ripple Voltage
1 µF
50 Ω
50 Ω Coax
Oscilliscope or equivalent
with 10 MHz bandwidth,
multiply readings by 2.
0.1 µF
+ Vout
Return
50 Ω
Termination
DUT
RL for IRATED
Radiation Performance Characterstics
Highest
Level
Test
Conditions
Min
Typ
Unit
Tested
MIL-STD-883, Method 1019
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
Krads
(Si)
Total Ionizing Dose ( Gamma )
100
>82
Heavy ions (LET)
Operating bias applied during exposure,
Full Rated Load, VIN = 28V
Single Event Effects
SEU, SEL, SEGR, SEB
MeV-cm2
/mg
82
International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program.
6
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LS-SERIES
LS Series Output Voltage Adjustment
Output of LS series can be adjusted to be greater or less than the nominal output voltage with an external
resistor. However, the ranges of the output voltages are limited depending on the model as specified in
Table 1 and 2. An approximate value of the resistor can be determined using the following formula.
A - (B x Vout)
For Single Output Model: Radj =
(C x Vout) - D
A - (B x 2Vout)
For Dual Output Model: Radj =
(C x 2Vout) - D
Where:
Radj is the value of the external resistor in kilo-ohms, Rdown or Rup in Figure 1 or 2.
Power rating of the resistor shall be ≥ 0.125W. Metal film resistor with temperature coefficient
of ≤ ±50 ppm and tolerance of ≤ 1% is recommended. However, the final selection is dependent
on specific design requirements.
Vout is the desired output voltage in volts.
A, B, C, and D are unique constants depending on the model as shown in Table 1
for single output models and Table 2 for dual output models.
Table 1: Single Output Voltage Ranges and Constants
Output Voltage Range
Model
A
B
C
D
(V) (1)
1.500 to 1.600
1.400 to 1.500
2.500 to 2.750
2.250 to 2.500
3.300 to 3.630
2.970 to 3.300
5.000 to 5.500
4.500 to 5.000
12.000 to 13.200
10.800 to 12.000
15.000 to 16.500
13.500 to 15.000
69.65
56.85
32.39
40.47
13.04
21.19
9.25
8.75
7.14
3.52
2.88
2.50
2.04
2.27
1.85
2.27
1.85
2.27
1.85
13.13
10.72
8.81
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
48.42
39.52
7.19
43.48
8.25
35.48
16.18
20.00
29.31
19.98
53.31
19.98
63.61
6.73
119.48
97.52
11.36
9.27
295.22
241.01
370.61
302.55
27.24
22.24
34.05
27.80
LS2812S
LS2815S
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7
LS-SERIES
Table 2: Dual Output Voltage Ranges and Constants
Voltage Range of Each Output
Model
A
B
C
D
(±Vout) (1)
±5.000 to ±5.500
±4.500 to ±5.000
196.91
160.74
475.43
388.10
594.31
485.10
17.12
31.11
17.05
58.04
17.03
69.47
1.71
1.40
1.71
1.39
1.70
1.39
17.12
13.97
40.92
33.41
51.09
41.70
LS2805D
LS2812D
LS2815D
±12.000 to ±13.200
±10.800 to ±12.000
±15.000 to ±16.500
±13.500 to ±15.000
Note:
(1). Also the minimum and maximum adjustment limits of the output voltage.
Placement of Radj
An external resistor must be added in order to trim the output voltage of an LS converter. The placement
of an Radj resistor (Rdown or Rup) must be as shown in Figure 1 for single output models and as per
Figure 2 for dual output models. Please note that the connections are made to the specific pins. Rup is
placed across Out Return and Out Adj pins for output voltage greater than nominal output. Similar
connections apply for the dual output models.
8
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LS-SERIES
Figure 1: Radj Placement for Single Output Model
0
>=1
0
0
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9
LS-SERIES
Figure 2: Radj Placement for Dual Output Model
0
>=1
0
0
10
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LS-SERIES
LS2801R5S Typical Efficiency at 25°C
70
60
50
40
30
20
10
0
18V
28V
40V
0
10
20
30
40
50
60
70
80 90 100
% of Rated Load
LS2802R5S Typical Efficiency at 25°C
100
90
80
70
60
50
40
30
20
10
0
18V
28V
40V
0
10 20 30 40 50 60 70 80 90 100
%of Rated Load
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11
LS-SERIES
LS2803R3S Typical Efficiency at 25°C
90
80
70
60
50
40
30
20
10
0
18V
28V
40V
0
10
20
30
40
50
60
70
80
90 100
% of Rated Load
LS2805S Typical Efficiency at 25°C
100
90
80
70
60
50
40
30
20
10
0
18V
28V
40V
0
10
20
30
40
50
60
70
80
90 100
% of Rated Load
12
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LS-SERIES
LS2815S Typical Efficiency at 25°C
90
80
70
60
50
40
30
20
10
0
18V
28V
40V
0
10 20
30 40 50 60 70
80 90 100
% of Rated Load
LS2815D Typical Efficiency at 25°C
100
80
60
40
20
0
18V
28V
40V
0
10
20
30
40
50
60
70
80
90 100
%of Rated Load
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13
LS-SERIES
Block Diagram - Single Output
1
7
6
2
4
3
0
0
5
>=1
0
Block Diagram - Dual Output
1
8
7
6
2
4
3
0
5
>=1
0
0
14
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LS-SERIES
Mechanical Outline
2.300
1.550
ø 0.128
4 Plcs
0.375
0.050
0.25 Typ.
0.270
0.470
0.400
0.400
1.000
Ref
1.500 1.750 2.000
0.400
0.200
2 Eq Spaces
@ 0.200
Pin ø
0.040
0.220
0.350
0.850
2.80
Ref
0.250
Tolerance: .XX = ±0.01
.XXX = ±0.005
0.425
Max
Pin Designation (Single/Dual)
Pin #
Single
Dual
1
2
3
4
5
6
7
8
+ Input
Input Return
Case Ground
Inhibit
+ Input
Input Return
Case Ground
Inhibit
Output Adjust
Output Return
+ Output
Output Adjust
- Output
Output Return
+ Output
NC
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15
LS-SERIES
Device Screening
Requirement
MIL-STD-883 Method
No Suffix
CK
EM
Temperature Range
Element Evaluation
Non-Destructive Bond Pull
Internal Visual
-55°C to +85°C
Class K
Yes
-55°C to +85°C
Class K
Yes
-55°C to +85°C
MIL-PRF-38534
2023
N/A
N/A
2017
Yes
Yes
Temperature Cycle
Constant Acceleration
PIND
1010
Cond C
Cond C
3000 Gs
Cond A
Cond C
3000 Gs
N/A
2001, Y1 Axis
2020
3000 Gs
Cond A
320 hrs @ 125°C
( 2 x 160 hrs )
-55°C, +25°C,
+85°C
320 hrs @ 125°C 48 hrs @ 125°C
( 2 x 160 hrs )
Burn-In
1015
Final Electrical
( Group A )
MIL-PRF-38534
& Specification
MIL-PRF-38534
1014
-55°C, +25°C,
+85°C
2%
-55°C, +25°C,
+85°C
PDA
2%
N/A
Seal, Fine and Gross
Radiographic
External Visual
Cond A, C
Yes
Cond A, C
Yes
Cond A
N/A
2012
2009
Yes
Yes
Notes:
Best commercial practice.
CK is DSCC class K compliant without radiation performance. No Suffix is a radiation rated device but
not available as a DSCC qualified SMD per MIL-PRF-38534.
International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program.
Standard Microcircuit Drawing Equivalence Table
Part Numbering
LS 28 05 S /EM
Standard Microcircuit
Drawing Number
5962-05238
IR Standard
Part Number
LS2801R5S
LS2803R3S
LS2805S
Model
Screening Level
(Please refer to Screening Table)
5962-05239
Input Voltage
No Suffix, CK, EM,
5962-05240
Nominal
28 = 28V
5962-05241
LS2812D
5962-05242
LS2815D
Output Voltage
Output
S = Single
D = Dual
5962-06241
LS2812S
01R5 = 1.5V, 02R5 = 2.5V,
03R3 = 3.3V, 05 = 5V,
12 = 12V, 15 = 15V
5962-06242
LS2815S
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 08/2006
16
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