IRF LS2812S Hybrid - high reliability radiation hardened dc-dc converter Datasheet

PD-96964E
HYBRID - HIGH RELIABILITY
RADIATION HARDENED
DC-DC CONVERTER
LS-SERIES
28V Input, Single/Dual Output
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. Extensive documentation
including, thermal analysis, stress analysis and reliability
predictions are available.
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.
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.
Manufactured in a facility fully qualified to MIL-PRF38534, these converters are fabricated utilizing DLA
Land and Maritime qualified processes. For available
screening options, refer to device screening table in the
data sheet.
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
2
82 MeV•cm /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
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
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
Variations in electrical specifications and screening to
meet custom requirements can be accommodated.
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1
10/12/12
LS-SERIES
(28V Input, Single/Dual Output)
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 internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD461C on the input power leads.
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.
2
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.
Design Methodology
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 derating to the requirements of MIL-STD-975 except
for the CDR type of capacitors, a capacitor with 50V
rating is used for in-circuit voltage stress of less
than10V. 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).
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LS-SERIES
(28V Input, Single/Dual Output)
Absolute Maximum Ratings
Recommended Operating Conditions
Input voltage range
Output power
Lead temperature
Operating case temperature
Storage temperature
Input voltage range
Output power
Operating case temperature
-0.5Vdc to +60Vdc
Internally limited
+300°C for 10 seconds
-55°C to +125°C (Note 13)
-55°C to +135°C
1
2
Operating case temperature
+18Vdc to +40Vdc
0 to Max. Rated
-55°C to +85°C
-55°C to +70°C
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
Parameter
Group A
Subgroup
Conditions
-55°C ≤ TC ≤ +85°C
V IN = 28V DC ± 5%, CL = 0
unless otherwise specified
Input Voltage
Output Voltage ( Vout )
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Output power ( POUT )
LS2801R5S
LS2802R5S
LS2803R3S
All Others
Output current ( IOUT )
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Line regulation ( VRLINE )
Load regulation ( VRLOAD )
LS2801R5S
LS2802R5S
All others
Cross regulation ( VRCROSS )
LS2805D
LS2812D
LS2815D
1
1
1
1
1
1
1
1
1
IOUT = 100% rated load
Note 4
2,3
2,3
2,3
2,3
2,3
2,3
2,3
2,3
2,3
IOUT = 100% rated load
Notes 4, 14
1,2,3
1,2,3
Limits
Min
Nom
Max
Unit
18
28
40
V
1.47
2.47
3.27
4.95
11.88
14.85
±4.95
±11.88
±14.85
1.50
2.50
3.30
5.00
12.00
15.00
±5.00
±12.00
±15.00
1.53
2.53
3.33
5.05
12.12
15.15
±5.05
±12.12
±15.15
1.43
2.43
3.23
4.90
11.76
14.70
±4.90
±11.76
±14.70
1.57
2.57
3.37
5.10
12.24
15.30
±5.10
±12.24
±15.30
V IN = 18, 28, 40 Volts, Note 2
0
0
0
0
12
20
25
30
V IN = 18, 28, 40 Volts, Note 2
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
Either Output, Note 3
Either Output, Note 3
Either Output, Note 3
V
V
W
A
1,2,3
VIN = 18, 28, 40 Volts
IOUT = 0, 50%, 100% rated, Note 4
-0.5
0.5
%
1,2,3
VIN = 18, 28, 40 Volts
IOUT = 0, 50%, 100% rated, Note 4
-2.0
-1.2
-1.0
2.0
1.2
1.0
%
VIN = 18, 28, 40 Volts
Duals only, Note 5
-5.0
-3.0
-3.0
5.0
3.0
3.0
%
1,2,3
For Notes to Electrical Performance Characteristics, refer to page 5
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3
LS-SERIES
(28V Input, Single/Dual Output)
Electrical Performance Characteristics
Parameter
Input Current, no load ( IIN)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Input current inhibited
Output Ripple, ( VRIP)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Switching frequency ( FS )
Efficiency ( EFF )
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
( continued )
Group A
Subgroup
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
1,2,3
IOUT = 0, Pin 4 open
1,2,3
1,2,3
Enable Input ( Inhibit Function )
open circuit voltage
drive current ( sink )
voltage range
Min
Nom
8.0
35
35
35
50
70
80
80
80
80
VIN = 18, 28, 40 Volts
IOUT = 100% rated load
Notes 4, 6
IOUT = 100% rated load
Note 4
Note 1
Current Limit Point
Expressed as a percentage
of full rated load current
1,2,3
Vout = 90% of Nominal, Note 4
Power dissipation, load fault (PD)
1,2,3
Short Circuit, Overload, Note 8
Output response to
step load changes (VTLD)
4,5,6
Half Load to/from Full Load, Notes 4,9
Recovery time,
step load changes (TTLD)
4,5,6
Half Load to/from Full Load, Note
4,9,10
Output response to
step line changes (VTLN)
18V to/from 40V
IOUT = 100% rated load, Notes 1,4,11
Recovery Time,
step line changes (TTLN)
18V to/from 40V
IOUT = 100% rated load, Notes
1,4,10,11
Max
60
60
60
70
70
70
70
100
100
Pin 4 shorted to pin 2
1,2,3
1,2,3
Limits
425
500
61
68
72
78
78
78
79
79
79
64
72
76
82
82
82
83
83
83
9.5
575
Unit
mA
mA
mV p-p
KHz
%
-0.5
12
5.0
50
V
mA
V
105
145
%
14
W
300
mV pk
200
µs
300
mV pk
200
µs
-300
-300
For Notes to Electrical Performance Characteristics, refer to page 5
4
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LS-SERIES
(28V Input, Single/Dual Output)
Electrical Performance Characteristics
Parameter
Turn-on Overshoot (VOS)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Turn-on Delay (TDLY)
Group A
Subgroup
4,5,6
Isolation
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Limits
Min
Nom
10% Load, Full Load
Notes 4,12
0
Capacitive Load (CL)
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
LS2805D
LS2812D
LS2815D
Line Rejection
( continued )
IOUT = 100% rated load
No effect on DC performance
Notes 1, 4, 7
Each output on duals
1
IOUT = 100% rated load
DC to 50KHz, Notes 1, 4
35
1
Input to Output or Any Pin to Case
except pin 3, test @ 500VDC
100
mV
2500
2500
2200
1000
180
120
500
90
60
µF
ms
dB
MΩ
80
MIL-HDBK-217F2, SF, 35°C
Unit
150
250
330
500
1000
1000
500
1000
1000
10
50
Device Weight
MTBF
Max
6
4.0 x 10
g
Hr
Notes for Electrical Performance Characteristics Table
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Parameter is tested as part of design characterization or after design changes. Thereafter, parameter
shall be guaranteed to the limits specified.
Parameter verified during line and load regulation tests.
Output load current must be distributed such that at least 20% of the total load current is being provided by
one of the outputs.
Load current split equally between outputs on dual output models.
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.
Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit
on page 6.
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.
Overload power dissipation is defined as the device power dissipation with the load set such that V OUT =
90% of nominal.
Load step transition time ≤ 10µs.
Recovery time is measured from the initiation of the transient to where V OUT has returned to within ±1% of
its steady state value.
Line step transition time ≤ 100µs.
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.
For operation at temperatures between +85°C and 125°C, de-rate the maximum output power linearly from
100% to 75%.
End of life (EOL) is ±3%
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5
LS-SERIES
(28V Input, Single/Dual Output)
Circuit for Measuring Output Ripple Voltage
50 Ω
50 Ω Coax
1 µF
Oscilliscope or equivalent
with 10 MHz bandwidth,
multiply readings by 2.
0.1 µF
+ Vout
50 Ω
Termination
DUT
Return
RL for IRATED
Radiation Performance Characteristics
Test
Conditions
Total Ionizing Dose (Gamma)
Operating bias applied during exposure,
Min
Typ
Unit
MIL-PRF-883, Method 1019.5
Half Rated Load, VIN = 28V
100
Krads(Si)
82
MeVxcm /mg
Heavy Ions (LET)
Single Event Effects
Operating bias applied during exposure,
SEU, SEL, SEGR, SEB
Full Rated Load, VIN = 18V, 28V & 40V
2
Test lab: Cyclotron Institute,
Texas A & M University
International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness
Assurance Program.
6
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LS-SERIES
(28V Input, Single/Dual Output)
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.
For Single Output Model:
For Dual Output Model:
Where:
Radj =
Radj =
A - (B x Vout)
(C x Vout) - D
A - (B x 2Vout)
(C x 2Vout) - D
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
Model
LS2801R5S
LS2802R5S
LS2803R3S
LS2805S
LS2812S
LS2815S
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Output Voltage Range
(V) (1)
A
B
C
D
1.500 to 1.600
69.65
32.39
8.75
13.13
1.400 to 1.500
56.85
40.47
7.14
10.72
2.500 to 2.750
48.42
13.04
3.52
8.81
2.250 to 2.500
39.52
21.19
2.88
7.19
3.300 to 3.630
43.48
9.25
2.50
8.25
2.970 to 3.300
35.48
16.18
2.04
6.73
5.000 to 5.500
119.48
20.00
2.27
11.36
4.500 to 5.000
97.52
29.31
1.85
9.27
12.000 to 13.200
295.22
19.98
2.27
27.24
10.800 to 12.000
241.01
53.31
1.85
22.24
15.000 to 16.500
370.61
19.98
2.27
34.05
13.500 to 15.000
302.55
63.61
1.85
27.80
7
LS-SERIES
(28V Input, Single/Dual Output)
Table 2: Dual Output Voltage Ranges and Constants
Model
Voltage Range of Each Output
(±Vout) (1)
A
B
C
D
±5.000 to ±5.500
196.91
17.12
1.71
17.12
LS2805D
LS2812D
LS2815D
±4.500 to ±5.000
160.74
31.11
1.40
13.97
±12.000 to ±13.200
475.43
17.05
1.71
40.92
±10.800 to ±12.000
388.10
58.04
1.39
33.41
±15.000 to ±16.500
594.31
17.03
1.70
51.09
±13.500 to ±15.000
485.10
69.47
1.39
41.70
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
(28V Input, Single/Dual Output)
Figure 1: Radj Placement for Single Output Model
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9
LS-SERIES
(28V Input, Single/Dual Output)
Figure 2: Radj Placement for Dual Output Model
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LS-SERIES
(28V Input, Single/Dual Output)
LS2801R5S Typical Efficiency at 25°C
Efficiency, %
70
60
50
40
30
20
18V
28V
40V
10
0
0
10
20
30
40
50
60
70
80
90
100
% of Rated Load
Efficiency,%
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
(28V Input, Single/Dual Output)
Efficiency, %
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
Efficiency, %
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
(28V Input, Single/Dual Output)
Efficiency, %
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
Efficiency, %
100
80
18V
60
28V
40
40V
20
0
0
10
20
30
40
50
60
70
80
90
100
% of Rated Load
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13
LS-SERIES
(28V Input, Single/Dual Output)
Block Diagram - Single Output
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LS-SERIES
(28V Input, Single/Dual Output)
Mechanical Outline
2.300
0.375
ø 0.128
4 Plcs
1.55
0.050
0.25 Typ.
0.27
8
0.47
1
0.40
7
0.40
1.00
Ref
1.50 1.75 2.000
3
6
4
5
2
2 Eq Spaces
@ 0.20
0.40
0.20
Pin ø
0.040
0.35
0.250 r 0.02
0.220
0.85
2.80
Ref
0.425
Max
Pin Designation (Single/Dual)
Tolerance: .XX = ±0.01
.XXX = ±0.005
Standard Microcircuit Drawing Equivalence Table
Pin #
Single
Dual
1
+ Input
+ Input
2
Input Return
Input Return
5962-05238
LS2801R5S
5962-05239
LS2803R3S
3
Case Ground
Case Ground
4
Inhibit
Inhibit
5
Output Adjust
Output Adjust
6
Output Return
- Output
7
8
+ Output
NC
Output Return
+ Output
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Standard Microcircuit
Drawing Number
IR Standard
Part Number
5962-05240
LS2805S
5962-05241
LS2812D
5962-05242
LS2815D
5962-06241
LS2812S
5962-06242
LS2815S
5962-10224
LS2805D
15
LS-SERIES
(28V Input, Single/Dual Output)
Device Screening
Requirement
MIL-STD-883 Method
Temperature Range
No Suffix
d
CK
d
-55°C to +85°C
-55°C to +85°C
EM
-55°C to +85°C
Element Evaluation
MIL-PRF-38534
Class K
Class K
N/A
Non-Destructive Bond Pull
2023
Yes
Yes
N/A
Internal Visual
2017
Yes
Yes
c
Temperature Cycle
1010
Cond C
Cond C
Cond C
Constant Acceleration
2001, Y1 Axis
3000 Gs
3000 Gs
3000 Gs
PIND
2020
Cond A
Cond A
N/A
320 hrs @ 125°C
320 hrs @ 125°C
48 hrs @ 125°C
( 2 x 160 hrs )
( 2 x 160 hrs )
Burn-In
1015
Final Electrical
MIL-PRF-38534
-55°C, +25°C,
-55°C, +25°C,
-55°C, +25°C,
( Group A )
& Specification
+85°C
+85°C
+85°C
PDA
MIL-PRF-38534
2%
2%
N/A
Seal, Fine and Gross
1014
Cond A, C
Cond A, C
Cond A
Radiographic
2012
Yes
Yes
N/A
External Visual
2009
Yes
Yes
c
Notes:
c
d
Best commercial practice.
CK is a DLA Land and Maritime (formerly DSCC) part marking used to designate a Class K compliant hybrid.
The CK marking does not indicate the hybrid is radiation certified.
No Suffix is a radiation rated device but not available as a DLA Land and Martime qualified SMD per MIL-PRF-38534.
International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness Assurance Program.
Part Numbering
LS
28 05 S /XX X
Model
Input Voltage
Nominal
28 = 28V
Output Voltage
01R5 = 1.5V, 02R5 = 2.5V,
03R3 = 3.3V, 05 = 5V,
12 = 12V, 15 = 15V
Lead Finish for CK only
C = Gold Plated
A = Solder Dipped
Blank for No Suffix and EM
Lead Finish for No Suffix = Solder Dipped
Lead Finish for EM is Gold Plated or
Solder Dipped depending on availability
Screening Level
(Please refer to Screening Table)
No Suffix, CK, EM,
Output
S = Single
D = Dual
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SAN JOSE: 2520 Junction Avenue, San Jose, California 95134, Tel: (408) 434-5000
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 10/2012
16
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