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PDF LSO2802R5S Data sheet ( Hoja de datos )
| Número de pieza | LSO2802R5S | |
| Descripción | HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER | |
| Fabricantes | IRF | |
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HYBRID-HIGH RELIABILITY
RADIATION HARDENED
DC-DC CONVERTER
PD-97812
LSO SERIES
28V Input, Single/Dual Output
Description
The LSO Series of DC-DC converters are, high reliability
devices designed for hostile radiation hardened
environments. The design is based on the heritage-rich
LS Series with enhanced functional performance and
an inclusion of an output overvoltage protection. The
LSO 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-1547, MIL-STD-975 and NASA EEE-INST-
002. Extensive documentation including, thermal
analysis, stress analysis and reliability predictions are
available.
The LSO 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. The converters
are overload, short circuit and output over-voltage
protected. They are enclosed in a hermetic 3.5" x 2.5" x
0.475" H steel package and weigh less than 125 grams.
The package utilizes rugged ceramic feed-through
copper core pins and is sealed using parallel seam
welding.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DLA
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.
www.irf.com
LSO
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 Derated per MIL-STD-1547, MIL-STD-975
and NASA EEE-INST-002
n Magnetically Coupled Feedback
n Up to 30W Output Power
n Single and Dual Output Models Include
1.5, 1.8, 2.5, 3.3, 5, 12, 15, ±5, ±12 and ±15V
n Remote Sense Compensation for Single
Output
n Latch-off Output Overvoltage Protection
n Input Current Telemetry
n Input Undervoltage Lockout with Latching
Mode Options
n High Efficiency - to 81%
n 20MΩ @ 100VDC Isolation
n Undervoltage Protection
n Short Circuit and Overload Protection
n Adjustable Output Voltage
n Adjustable External OVP-115% to 125%
n External Inhibit
n Low Weight, < 125 grams
n 4000000 Hour MTBF (SF)
Applications
n Geo Synchronous Satellite
n Low Earth Orbit
n Deep Space Probe
n Communication and Display Systems
n Payload and Experiment LVPS
1
08/27/13
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1 page  
LSO SERIES
28V Input, Single/Dual Output
Electrical Performance Characteristics (continued)
Parameter
Group A
Subgroup
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Line regulation ( VRLINE )
All Single and Dual Output Models
1,2,3
VIN = 18, 28, 40 Volts
IOUT = 0, 50%, 100% rated, Note 4
Load regulation ( VRLOAD )
All Single Output Models
1,2,3
Total regulation ( Line and Load ) 1,2,3
Cross regulation (VRCROSS )
LSO2805D
LSO2812D
LSO2815D
1,2,3
VIN = 18, 28, 40 Volts
IOUT = 0, 50%, 100% rated, Note 4
VIN = 18 to 40 Volts
Min load to full load
Dual model is measured
from +Output to –Output, Note 13
VIN = 18, 28, 40 Volts
Duals only, Note 5
Input Current, no load (IIN )
LSO2801R5S
LSO2801R8S
LSO2802R5S
LSO2803R3S
LSO2805S
LSO2812S
LSO2815S
LSO2805D
LSO2812D
LSO2815D
Input current inhibited
1,2,3
1,2,3
IOUT = 0, Pin 3 open
Pin 4 shorted to Pin 3
Output Ripple (VRIP)
LSO2801R5S
LSO2801R8S
LSO2802R5S
LSO2803R3S
LSO2805S
LSO2812S
LSO2815S
LSO2805D
LSO2812D
LSO2815D
1,2,3
VIN = 18, 28, 40 Volts
IOUT = 100% rated load
Notes 4, 6
Switching frequency (FS )
Efficiency (EFF )
LSO2801R5S
LSO2801R8S
LSO2802R5S
LSO2803R3S
LSO2805S
LSO2812S
LSO2815S
LSO2805D
LSO2812D
LSO2815D
Input undervoltage lockout (UVLO)
(turn off when input voltage
decreassing)
Input undervoltage release (UVR)
(turn on when input voltage rising)
Input undervoltage
Hysteresis (UVR-UVLO)
Input current telemetry ratio( ICT)
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
IOUT = 100% rated load
Note 4
No load to full load, Notes 1, 4
No load to full load, Notes 1, 4
No load to full load, Notes 1, 4
IOUT = 100% rated load, Note 4
For Notes to Electrical Performance Characteristics, refer to page 7
www.irf.com
Min
-0.5
-1.0
-1.0
-5.0
-3.0
-3.0
425
60
63
67
71
77
77
77
76
78
78
14.5
15.5
1.0
1.4
Limits
Nom
500
62
65
69
73
80
80
80
79
81
81
Unit
Max
0.5 %
1.0 %
1.0 %
5.0
3.0 %
3.0
60
60
60
60
70 mA
70
70
70
100
100
8.0 mA
35
35
35
35 mV p-p
50
70
50
50
50
50
575 KHz
%
16.5
17.9
3.0
1.6
V
V
V
V/A
5
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5 Page 
LSO SERIES
28V Input, Single/Dual Output
OVP External Adjustment:
Over-voltage Protection threshold of LSO singles and
duals can be adjusted to be greater or less the nominal
OVP with a couple of external resistors. Lower resistors,
R1 and R2 are 10KΩ resistors, while Radj set the new
OVP threshold as stated in Table 6 for single output
models and Table 7 for dual output models. Ranges of
LSO series converter can be adjusted from 115% to
125% of the nominal output voltage. See Fig.8 to place
external resistors.
An approximate value of the resistor can be determined
using the following formula.
Radj
=
(A * Vovp ) - B
C - (D * Vovp)
Where:
Radj is the upper external resistor in kilo-ohms, as shown
in Fig 8. Power rating of the resistor shall be
≥ 0.125 W. 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.
Vovp is the output voltage protection limit in volts.
Table 7. LSO Duals. OVP Exeternal
Range
Vo* (115%)
Vo* (116%)
Vo* (117%)
Vo* (118%)
Vo* (119%)
Vo* (120%)
Vo* (121%)
Vo* (122%)
Vo* (123%)
Vo* (124%)
Vo* (125%)
LSO2805DS
OVP
5.75
5.80
5.85
5.90
5.95
6.00
Radj
(KΩ)
26
28
30
33
36
39
6.05 43
6.10 47
6.15 51
6.20 57
6.25 64
LSO2815D
OVP
17.25
17.40
17.55
Radj
(KΩ)
101
107
113
17.70
121
17.85
18.00
128
137
18.15
18.30
146
157
18.45
169
18.60
183
18.75
199
Fig. 8 - OVP with External Adjustment
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A, B, C and D are unique constants depending on every
model.
Placement of Radj: Two external resistors must be
added in order to set new OVP threshold.
Singles: Radj(OVP) is placed across +Output and OVP
Adj pins and R1 from OVP Adj to -Output.
Duals: Radj(+OVP) is placed across +Output and +OVP
Adj pins and R1 from +OVP Adj to -Return. Radj(-OVP) is
placed across +Return and -OVP Adj pins while R2 is
placed across -OVP Adj to –Output.
Table 6. LSO Singles. OVP Exeternal
Range
Vo* (115%)
Vo* (116%)
Vo* (117%)
Vo* (118%)
Vo* (119%)
Vo* (120%)
Vo* (121%)
Vo* (122%)
Vo* (123%)
Vo* (124%)
Vo* (125%)
LSO2803R3S
OVP
3.79
3.82
3.86
3.89
3.92
3.96
3.99
4.02
4.05
4.09
Radj
(KΩ)
13
15
16
18
20
22
25
28
31
36
4.12
41
LSO2805S
OVP
5.75
5.80
5.85
5.90
5.95
6.00
6.05
6.10
6.15
6.20
6.25
Radj
(KΩ)
26
28
31
33
36
39
42
46
51
56
63
LSO2815S
OVP
17.25
17.40
17.55
17.70
17.85
18.00
18.15
18.30
18.45
18.60
18.75
Radj
(KΩ)
102
108
114
121
128
137
146
157
168
181
197
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Stacking Outputs:
On dual output models, output can be stacked to double
the output voltage as shown in Fig 9.
Fig. 9 - Stacked Outputs on Dual Models
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11
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