PD-94584M
S-SERIES
HYBRID-HIGH RELIABILITY
RADIATION HARDENED
LOW POWER
DC-DC CONVERTER
28V Input, Single/Dual Output
Description
The S-Series of DC-DC converters are low power radiation
hardened, high reliability devices designed for hostile
radiation environments such as those encountered by
geostationary earth orbit satellites, deep space probes and
communication systems. Features include small size, high
efficiency, low weight and a high tolerance to total ionizing
dose, single event effects, and environmental stresses such
as temperature extremes, mechanical shock, and vibration.
Extensive documentation including Radiation Susceptibility,
Thermal Analysis, Stress Analysis and MTBF are available.
The converters incorporate a fixed frequency single ended
forward topology with magnetic feedback and an internal
EMI filter utilizing large multilayer ceramic capacitors
processed per MIL-PRF-49470 for improved reliability. All
models include an external inhibit port . They are encased
in a hermetic 1.71” x 1.31” x 0.45” steel package and weigh
less than 50 grams. The package utilizes rugged ceramic
feed-through copper core pins and is hermetically sealed
using parallel seam welding.
Manufactured in a facility fully qualified to MIL-PRF-38534,
these converters are fabricated utilizing DLA Land and
Maritime qualified processes. For available screening
options, refer to device screening table in the data sheet.
Non-flight versions of the S-Series converters are available
for system development purposes. Variations in electrical
specifications and screening to meet custom requirements
can be accommodated. Consult IR HiRel San Jose for
special requirements.
S
Features
Total Dose > 100 kRads(Si)
SEE Hardened to LET up to 82 MeV.cm
2
/mg
Low Weight < 50 grams
Magnetically Coupled Feedback
18V to 40V Input Range
Up to 10W Output Power
Single and Dual Output Models Include
3.3, 5, 7, 12, 15, ±5, ±12, ±15V
High Efficiency - to 82%
-55°C to +125°C Operating Temperature Range
100M @ 500VDC Isolation
Under-Voltage Protection
Short Circuit and Overload Protection
External Inhibit
Standard Microcircuit Drawings Available
Applications
Geostationary or Low Earth Orbit Satellites
Launch Vehicles
Communication Systems
1
International Rectifier HiRel Products, Inc.
2020-05-13
(28V Input, Single/Dual Output)
S-SERIES
Circuit Description
The S-Series converters utilize a single-ended forward
topology with resonant reset. The nominal switching frequency
is 525 kHz. 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.
Output power is limited under any load fault condition to
approximately 135% for singles and 145% for duals of
rated. An overload condition causes the converter output
to behave like a constant current source with the output
voltage dropping 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. There are
no latching elements included in the load fault protection
circuits to eliminate the possibility of falsely triggering the
protection circuits during single event radiation exposure.
An under-voltage protection circuit prohibits the converter
from operating when the line voltage is too low for safe
operation. The converter will not start until the line voltage
rises to approximately 12V.
An external enable port is provided to control converter
operation. This input is intended for operation with an
open collector transistor drive or a relay closure to the
input return. The pin may be left open for normal operation and
has a nominal open circuit voltage of 10.5V.
Design Methodology
The S-Series was developed using a proven conservative
design methodology, which includes selecting radiation
tolerant, and established reliability components and fully
de-rating to the requirements of MIL-STD-975 and
MIL-STD-1547 except for the CDR type of capacitors, a
capacitor with 50V rating is used for in-circuit voltage
stress of less than10V. Heavy de-rating of the radiation
hardened power MOSFET virtually eliminates the
possibility of SEGR and SEB. A magnetic feedback
circuit is utilized instead of opto-couplers to minimize
temperature, radiation and aging sensitivity. PSPICE was
used extensively to predict and optimize circuit
performance for both beginning and end-of-life. Thorough design
analyses include Radiation Susceptibility (TREE), Worst Case,
Stress, Thermal and Reliability (MTBF).
2
International Rectifier HiRel Products, Inc.
2020-05-13
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input voltage range
Output power
Lead temperature
Operating temperature
Storage temperature
-0.5V
DC
to +60V
DC
Internally limited
+300°C for 10 seconds
-55°C to +135°C
-55°C to +135°C
Operating temperature
Operating temperature
1
1
S-SERIES
Recommended Operating Conditions
Input voltage range
Output power
+16V
DC
to +40V
DC
0 to Max. Rated
-55°C to +125°C
-55°C to +70°C
Meets de-rating per MIL-STD-975
Electrical Performance Characteristics
Parameter
Input voltage
Output voltage (V
OUT
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Output power (P
OUT
)
All models
Output current (I
OUT
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Line regulation (VR
LINE
)
S28XXS
S28XXD
Load regulation (VR
LOAD
)
S28XXS
S28XXD
Group A
Subgroup
Conditions
-55°C
T
C
+85°C
V
IN
= 28V DC ± 5%, C
L
= 0
unless otherwise specified
Limits
Min
18
1
1
1
1
1
1
1
1
2,3
2,3
2,3
2,3
2,3
2,3
2,3
2,3
1,2,3
1,2,3
3.27
4.95
6.93
11.88
14.85
±4.95
±11.88
±14.85
3.230
4.900
6.895
11.760
14.700
±4.900
±11.760
±14.700
0
0
0
0
0
0
0.16
0.06
0.05
-0.5
-0.5
-1.0
-1.0
Nom
28
3.30
5.00
7.00
12.00
15.00
±5.00
±12.00
±15.00
Max
40
3.33
5.05
7.07
12.12
15.15
±5.05
±12.12
±15.15
3.370
5.100
7.105
12.240
15.300
±5.100
±12.240
±15.300
10
3.03
2.00
1.43
0.83
0.67
1.60
0.66
0.54
0.5
0.5
1.0
1.0
W
Unit
V
I
OUT
= 100% rated load
Note 4
V
I
OUT
= 100% rated load
Note 4
V
IN
= 18, 28, 40 Volts, Note 2
V
IN
= 18, 28, 40 Volts, Note 2
A
Either Output, Note 3
Either Output, Note 3
Either Output, Note 3
1,2,3
V
IN
= 18, 28, 40 Volts
I
OUT
= 0, 50%, 100% rated
I
OUT
= 10%, 50%, 100% rated, Note 4
V
IN
= 18, 28, 40 Volts
I
OUT
= 0, 50%, 100% rated
I
OUT
= 10%, 50%, 100% rated, Note 4
%
1,2,3
%
For Notes to Electrical Performance Characteristics, refer to page 6
3
International Rectifier HiRel Products, Inc.
2020-05-13
(28V Input, Single/Dual Output)
Electrical Performance Characteristics (continued)
Parameter
Cross regulation (VR
CROSS
)
S2805D
S2812D
S2815D
Total regulation
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Input current (I
IN
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Group A
Subgroup
Conditions
-55°C
T
C
+85°C
V
IN
= 28V DC ± 5%, C
L
= 0
unless otherwise specified
Duals only, Note 5
V
IN
= 18, 28, 40 Volts
Limits
Unit
Min
-5.0
-3.0
-3.0
-2.0
-2.0
-2.0
-2.0
-2.0
-5.0
-3.0
-3.0
Nom
Max
5.0
3.0
3.0
2.0
2.0
2.0
2.0
2.0
5.0
3.0
3.0
60
70
70
70
70
70
70
70
5.0
475
525
575
50
50
45
50
60
80
80
80
68
75
76
78
77
76
76
76
9.5
1,2,3
Note 1
-0.5
73
80
81
81
82
80
81
82
11.5
500
50
S-SERIES
1,2,3
%
1,2,3
V
IN
= 18, 28, 40 Volts
Single Output: I
OUT
= 0% ,50%,100%
of rated current Note 14
Dual Output: I
OUT
= 10% ,50%,100%
of rated current Notes 4, 14
%
1,2,3
I
OUT
= 0, Pin 4 open
mA
Pin 4 shorted to pin 2
1,2,3
mA
kHz
Switching frequency (F
S
)
Output ripple (V
RIP
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Efficiency (E
FF
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Enable input (Inhibit Function)
Open circuit voltage
Drive current (sink)
Voltage range
1,2,3
V
IN
= 18, 28, 40 Volts
I
OUT
= 100% rated load
Notes 4, 6
mVp-p
1,2,3
I
OUT
= 100% rated load
Note 4
%
V
A
V
For Notes to Electrical Performance Characteristics, refer to page 6
4
International Rectifier HiRel Products, Inc.
2020-05-13
(28V Input, Single/Dual Output)
Electrical Performance Characteristics (continued)
Group A
Subgroup
Conditions
-55°C
T
C
+85°C
V
IN
= 28V DC ± 5%, C
L
= 0
unless otherwise specified
Limits
Unit
Min
Nom
Max
S-SERIES
Parameter
Current limit point
Expressed as a percentage
of full rated load current
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Power dissipation, load fault (P
D
)
Output response to
step load changes (V
TLD
)
Recovery time,
step load changes (T
TLD
)
Output response to
step line changes (V
TLN
)
1,2,3
V
OUT
= 90% of Nominal, Note 4, 13
105
105
110
105
110
105
105
105
140
140
144
145
146
150
160
167
9.0
%
1,2,3
4,5,6
4,5,6
Short Circuit, Overload, Note 8
Half Load to/ from Full Load, Notes 4,9
Half Load to/from Full Load, Notes
4,9,10
18V to/from 40V
I
OUT
= 100% rated load, Notes 1,4,11
-300
-300
W
mVpk
s
300
200
4,5,6
300
mVpk
Recovery time,
step line changes (T
TLN
)
Turn-on response
Overshoot (V
OS
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
Turn-on delay (T
DLY
)
Capacitive load (C
L
)
S2803R3S
S2805S
S2807S
S2812S
S2815S
S2805D
S2812D
S2815D
4,5,6
18V to/from 40V
I
OUT
= 100% rated load,
Notes 1,4,10,11
200
s
4,5,6
10% Load, Full Load
Notes 4,12
1.5
500
600
750
1400
1650
600
1400
1500
10
mV
ms
1
I
OUT
= 100% rated load
No effect on DC performance
Notes 1, 4, 7
Each output on duals
2200
1000
750
180
120
500
90
60
µF
For Notes to Electrical Performance Characteristics, refer to page 6
5
International Rectifier HiRel Products, Inc.
2020-05-13
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