SA50-120 Triple Series
RADIATION HARDENED
ISOLATED DC/DC CONVERTERS
SA50-120-5-15T
50 Watts Total Power
5V
dc
, +/- 15V
dc
, Triple Output
DESCRIPTION
The SA series of DC-DC converters
are designed for the rigors of space,
characterized for Total Ionizing
Dose and Single Event Effects. Oper-
ating at a fixed frequency of 220
kHz, the SA family of parts can be ex-
ternally synced with other fre-
quency sources. The SA50 contains
an internal EMI filter making it com-
pliant to Mil Std 461 emissions and
susceptibility.
Microsemi Power Management Group
(PMG)
has achieved decades of flawless
execution in harsh space environments.
PMG’s heritage, producing complex cus-
tom (radiation hardened) switching
power designs and systems is now com-
plimented with the introduction of the
“SA Series” Standard Radiation Hardened
DC/DC converter modules. The same rig-
orous design methodology employed for
custom designs has been applied to the
SA Family of standard products. Designed
and manufactured in the USA, the SA50
family requires an ITAR license for export
which we will be happy to facilitate.
FEATURES
+120 V
dc
Satellite Input Interface
100kRad (Si) TID; Single Event Effect rated
Surface Mount Construction (non-hybrid)
50W total power, high efficiencies 86%+
Patented Magnetic Feedback
Isolated Synchronization Input
Primary referenced ON – OFF command
Over-current Protection
Input Under-voltage lockout
MIL-STD-1547B design de-rating criteria
100% Space level Environmental Screening
Standard Mounting 2.05” x 3.05” x 0.475”
Single, Dual & Triple Output Options
SEE > 80 MeV•cm2 /mg Version Available
EMI Compliance to MIL-STD-461
SA50-120-5-15T Rev A5
© 2013 Microsemi Corporation
—
Power
Management Group
Page 1 of 20
SA50-120 Triple Series
ELECTRICAL PARAMETERS
Absolute Maximum Ratings
VIN range
Output power
Lead temperature
Storage temperature
Shock
Constant Acceleration
Random Vibration
a
b
c
d
Recommended Operating Conditions
VIN range
VIN range
a
VIN range
b
VIN range
d
Output power
Operating temperature
c
+86Vdc to +158Vdc
+86Vdc to +120Vdc
+86Vdc to +100Vdc
+86Vdc to +135Vdc
2 watts to Max. Rated
-55°C to +125°C
-0.5Vdc to +158Vdc
50 Watts
+300°C for 10 Sec.
-55°C to +125°C
1500 gpk, 0.5 msec, ½ sine
50 g
24.06 grms , 50-2000 Hz
Operating temperature -55°C to +125°C
Operating temperature
a,b
-55°C to +70°C
Meets derating per MIL-STD-975M
Meets derating per MIL-STD-1547B
For operation at +125°C see table Note 15
Single Event Effect compliant
SA50-120-5-15T Rev A5
© 2013 Microsemi Corporation
—
Power
Management Group
Page 2 of 20
SA50-120 Triple Series
ELECTRICAL PARAMETERS
Group A
Subgroup
1 25°C
2 -55°C
3 85°C
1,2,3
1
2,3
Conditions
-55°C ≤ T
CASE
≤ +85°C
V
IN
= 120V DC ± 5%, C
L
= 0
unless otherwise specified
Note 2
IOUT = 100% rated load, Note 5
IOUT = 100% rated load, Note 5
Min
86
5.08
14.46
5.05
14.25
5
Nom
120
5.10
14.75
5.10
14.75
Max
158
5.12
15.05
5.15
15.25
50
Parameter
Limits
Unit
Input Voltage
Output Voltage ( V
OUT
)
(main)
(aux.)
(main)
(aux.)
Output Power (P
OUT
)
Output current (I
OUT
)
(main)
(aux.)
Line regulation ( VR
LINE
)
(main)
(aux.)
Load regulation ( VR
LOAD
)
(main)
(aux.)
Cross regulation (VR
CROSS
)
(aux.)
V
V
V
1,2,3
VIN = 86, 120, 158 Volts, Notes 2,4
W
1,2,3
VIN = 86, 120, 158 Volts, Notes 2,3,4,5
400
100
4000
1000
mA
1,2,3
VIN = 86, 120, 158 Volts
IOUT =10%, 50%, 100% rated, Notes 5, 14
-10
-150
10
150
mV
1,2,3
VIN = 86, 120, 158 Volts
IOUT =10%, 50%, 100% rated, Note 5, 13
-50
-500
50
500
mV
1,2,3
VIN = 86, 120, 158 Volts
IOUT = 2.5A to 1A and 2.5A to 4A on main
and ±half rated on aux. outputs
IOUT = 0, Pin 3 open
Pin 3 shorted to pin 2
-3.00
3.00
%
Input current (I
IN
)
Output ripple (V
RIP
)
(main)
(aux.)
Switching frequency (F
S
)
Efficiency ( EFF )
Inhibit Input
ON voltage (or Open Collector)
OFF drive current (sink)
OFF voltage
1,2,3
7
3.0
10
5.0
mA
1,2,3
VIN = 86, 120, 158 Volts
IOUT = 100% rated load, Notes 5, 6
Sync. Input (Pin 4) open
IOUT = 100% rated load, Note 5
200
[80] 84
25
37.5
220
[82] 86
50
75
240
mV p-p
1,2,3
1,2,3
kHz
%
Note 1
4.5
1000
2
V
μA
V
SA50-120-5-15T Rev A5
© 2013 Microsemi Corporation
—
Power
Management Group
Page 3 of 20
SA50-120 Triple Series
ELECTRICAL PARAMETERS
Group A
Subgroup
1 25°C
2 -55°C
3 85°C
Parameter
Conditions
-55°C ≤ T
CASE
≤ +85°C
V
IN
= 120V DC ± 5%, C
L
= 0
unless otherwise specified
Min
500
500
4.0
4.0
-0.5
-0.5
200
200
10
10
105
105
Limits
Unit
Max
600
600
10.0
10.0
0.5
0.5
80
80
135
135
18
18
kHz
kHz
V
V
V
V
V/μs
V/μs
%
%
%
%
W
W
Nom
Synchronization Input
Synchronization Input
frequency range
frequency range
pulse high level
pulse high
level
pulse low
level
pulse low level
rate
pulse transition
pulse transition rate
pulse duty cycle
pulse duty cycle
Current Limit Point
Current Limit
a % of full rated
Expressed as
Point
Expressed as a % of full rated
output current
output current
Power dissipation,
Power dissipation,
load fault (P
D
)
load fault (P
D
)
Output response to
Output response to
step load changes (V
TLD
)
step load changes (V
TLD
)
Recovery time,
Recovery time,
(T )
step load changes
TLD
step load changes (T
TLD
)
Output response
Output
line changes (V )
to step
response
TLN
to step line changes (V
TLN
)
Recovery time,
Recovery
changes (T )
step line
time,
TLN
step line changes (T
TLN
)
Turn-on Response
Turn-on Response
Overshoot (V
OS
) (main)
Overshoot (V
OS
) (main)
Overshoot (V ) (aux.)
OS
Ext. Clock on Sync. Input (Pin 4)
Ext. Clock on Sync. Input (Pin 4)
Note 1
Note 1
1,2,3
1,2,3
1,2,3
1,2,3
VOUT = 90% of Nominal, Note 5
VOUT = 90% of Nominal, Note 5
Short Circuit, Overload, Note 8
Short Circuit, Overload, Note 8
Half Load to/from Full Load, Notes 5,9
Half Load to/from Full Load, Notes 5,9
Half Load to/from Full Load, Note 5,9,10
Half Load to/from Full Load, Note 5,9,10
86V to/from 158V
86V to/from 158V
IOUT = 100% rated load, Notes 1, 5,11
IOUT = 100% rated load, Notes 1, 5,11
86V to/from 158V
86V to/from 158V
IOUT = 100% rated load, Notes 1, 5,11
IOUT = 100% rated load, Notes 1, 5,11
4,5,6
4,5,6
4,5,6
4,5,6
-300
-300
50
50
-300
-300
50
50
300
300
200
200
300
300
200
200
mV pk
mV pk
μSec
μSec
mV pk
mV pk
μs
μs
Overshoot (V
OS
) (aux.)
Turn-on Delay (T
DLY
)
Turn-on Delay (T
DLY
)
Capacitive Load (C
L
)
Capacitive Load (C
L
)
(main)
(main)
(Each aux. output)
(Each aux. output)
Line Rejection
Line Rejection
4,5,6
4,5,6
No Load, Full Load
No Load, Full Load
Notes 5,12
Notes 5,12
1.0
1.0
500
500
750
750
5.0
mV
mV
mV
mV
mSec
5.0
1000
1000
200
250
mSec
μF
μF
μF
μF
dB
dB
Isolation
Isolation
1
1
Device Weight
Device Weight
MTBF
MTBF
IOUT = 100% rated load, No effect on DC
IOUT =
performance, Notes 1, 5, 7
on DC
100% rated load, No effect
performance, Notes 1, 5, 7
DC to 50KHz, Notes 1, 5
DC to 50KHz, Notes 1, 5
IOUT = 100% rated load
IOUT = 100% rated load
Input (Pins 1,2,3) to Outputs
Input (Pins 1,2,3) to Outputs
Any Pin to Case (except pin 6)
Any Pin to
Rtn to any pin and
Sync and Sync
Case (except pin 6)
case
Sync and
Main to Aux
any pin and case
Sync Rtn to
outputs
Main to
@ 200VDC
Test
Aux outputs
Test @ 200VDC
MIL-HDBK-217F2, SF, 35°C
MIL-HDBK-217F2, SF, 35°C
40
40
60
60
100
100
MΩ
MΩ
8.22E+06
8.22E+06
110
110
g
g
Hrs
Hrs
SA50-120-5-15T Rev A5
© 2013 Microsemi Corporation
—
Power
Management Group
Page 4 of 20
SA50-120 Triple Series
ELECTRICAL PARAMETERS
Radiation Tests
Test
Total Ionizing Dose
(Gamma)
Dose Rate (Gamma Dot)
Temporary Saturation Survival
Neutron Fluence
Single Event Effects SEU, SEL, SEGR,
SEB
Conditions
MIL-STD-883, Method 1019
Operating bias applied during exposure,
MIL-STD-883, Method 1023
Operating bias applied during exposure,
Full Rated Load, VIN = 70V
MIL-STD-883, Method 1017
Heavy ions (LET)
Operating bias applied during exposure,
Full Rated Load, VIN = 70V, Note 5
Min
100
1E8
4E10
8E12
35
[82]
Typ
300
Unit
KRad (Si)
Rad (Si)
/sec
Neutrons
/cm
2
MeV•cm
2
/mg
1E11
1E13
39.7
[86]
Notes: Electrical Performance Characteristics
1. Parameter guaranteed by design.
2. Parameter verified during line and load regulation tests. Regulation is specified for 10% to 100% loading on all outputs.
3. Auxiliary output regulation is not maintained if main output load is less than 10%.
4. Auxiliary outputs require at least 10% loading for specified regulation. Voltage may increase at lighter loads and is ultimately limited by overvoltage zener diodes.
5.Unless otherwise specified, “Rated” load is 20W on the main (+5 volt) output and 15 watts each on the auxiliary (±15 volt) outputs. Load currents of up to 5A and ±1.5A on the main
and auxiliary outputs respectively are acceptable as long as the total output power does not to exceed 50 watts. Values in [ ] brackets reflect “-H" option SEE hardened version
performance. The "-H" option incorporates alternative FET technologies providing a >82 MeV•cm2 /mg (Gold Ion) SEE capability to the design.
6. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20kHz to 10MHz bandwidth.
7. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit may interfere with the
proper operation of the converter’s overload protection, causing erratic behavior during turn-on.
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 3) to the point where VOUT = 90% of nominal.
13. Load Regulation relative to output voltage at 50% rated load.
14. Line Regulation relative to output voltage at 120Vdc input.
15. For operation at temperatures between +85°C and +125°C, derate power linearly from 50 watts to zero. Parameter limits are not guaranteed.
SA50-120-5-15T Rev A5
© 2013 Microsemi Corporation
—
Power
Management Group
Page 5 of 20
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