PD-94692E
AMA28XXD SERIES
HYBRID - HIGH RELIABILITY
RADIATION TOLERANT
DC-DC CONVERTER
Description
The AMA28XXD series of DC-DC converter modules
has been specifically designed for operation in
moderate radiation environments supplementing the
higher radiation performance available in the
International Rectifier ART2815T converter series.
Environments presented to space vehicles operating
in low earth orbits, launch boosters, orbiting space
stations and similar applications requiring a low power,
high performance converter with moderate radiation
hardness performance will be optimally served by the
AMA28XXD Series.
The physical configuration of the AMA28XXD series
permits mounting directly to a heat conduction surface
without the necessity of signal leads penetrating the
heat sink surface. This package configuration permits
greater independence in mounting and more
mechanical security than traditional packages.
International Rectifier’s rugged ceramic seal pins are
used exclusively in the package thereby assuring long
term hermeticity.
The AMA28XXD has been designed for high density
using chip and wire hybrid technology that complies
with the class H requirements of MIL-PRF-38534.
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.
Applicable generic lot qualification test data including
radiation performance can be made available on
request. Variations to the standard screening can be
accomodated. Consult IR San Jose for special
requirements.
28V Input, Dual Output
AMA
Features
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5.0 Watts Output Power
Available in
±
5,
±12
and
±15
Volt Outputs
16- 40 VDC Input Range (28 VDC Nominal)
Total Ionizing Dose > 25KRads (Si)
2
SEE Hardened to LET up to 60 MeV
.
cm /mg
-55°C to +125°C Operating Range
Indefinite Short Circuit Protection
Flexible Mounting
Fully Isolated - Input to Output and to Case
Complimentary EMI Filter Available
Electrical Performance Similar to
ASA28XXD Series
n
Standard Microcircuit Drawings Available
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1
08/17/10
AMA28XXD Series
Specifications
Absolute Maximum Ratings
Input Voltage range
Soldering temperature
Storage case temperature
80V (100ms)
300°C for 10 seconds
-65°C to +135°C
-55°C
≤
TCASE
≤
+125°C, VIN = 28VDC
±5%,
C
L
= 0, unless otherwise specified.
Recommended Operating Conditions
+16V to +40VDC
Less than or equal to 5W
-55°C to +125°C
Output Power
Operating case temperature
-0.5V to +50VDC (Continuous), Input Voltage range
Static Characteristics
Parameter
Input Voltage
Output Voltage
Group A
Subgroups
Test Conditions
Min
16
Nom
28
Max
40
Unit
V
AMA2805D
AMA2812D
AMA2815D
AMA2805D
AMA2812D
AMA2815D
Output Current
1, 2
1
1
1
2, 3
2, 3
2, 3
Vin = 28 Volts, 20% load on
both outputs
±4.95
±5.00
±5.05
±11.88 ±12.00 ±12.12
±14.85 ±15.00 ±15.15
±4.90
±11.76
±14.70
±5.10
±12.24
±15.30
V
AMA2805D
AMA2812D
AMA2815D
Output Power
1, 2
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 16, 28, 40 Volts
each output
each output
each output
Vin = 28 Volts, 100% load
Vin = 16, 28, 40 Volts
100% load
BW = 20 Hz to 2 MHz
200
83
67
800
333
267
5.0
mA
W
Output Ripple Voltage
AMA2805D
AMA2812D
AMA2815D
Output Voltage Regulation
Line
3
1, 3
1, 2, 3
1, 2, 3
1, 2, 3
200
200
290
mV
PP
AMA2805D
AMA2812D
AMA2815D
AMA2805D
AMA2812D
AMA2815D
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 16, 28, 40 Volts
Iout = 10, 50%, 100% load
±10
±10
±10
±10
±10
±10
±25
±50
±50
±50
±50
±50
mV
Load
For Notes to Specifications, refer to page 4
2
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AMA28XXD Series
Static Characteristics
(Continued)
Parameter
Cross Regulation
5
-55°C
≤
TCASE
≤
+125°C, VIN= 28VDC
±5%,
C
L
= 0, unless otherwise specified.
Group A
Subgroups
1, 2, 3
1, 2, 3
1, 2, 3
Test Conditions
Minimum 1.0 watt on both
outputs 20%-80% load
Min
Nom
Max
15
8.0
8.0
Unit
AMA2805D
AMA2812D
AMA2815D
Input Current
No Load
Inhibit
3
%
1, 2, 3
1, 2, 3
Vin=28V,
Iout=0, Inhibit (pin 5)=open
Inhibit (pin 5) shorted to input
return (pin 7)
Vin = 16, 28, 40 Volts, 100%
load, BW = 20 Hz to 2 MHz
35
60
mA
12
Input Ripple Current
AMA2805D
AMA2812D
AMA2815D
Efficiency
3
1, 2, 3
1, 2, 3
1, 2, 3
100
100
100
mA
PP
100% load
AMA2805D
AMA2812D
AMA2815D
AMA2805D
AMA2812D
AMA2815D
1, 3
1, 3
1, 3
2
2
2
1
5, 6
66
71
71
60
68
68
Input to output or any pin to
case (except pin 8) at 500Vdc
No effect on dc performance,
total for both outputs
100
%
Isolation
MΩ
Capacitive Load
AMA2805D
AMA2812D
AMA2815D
Short Circuit Power Dissipation
4
4
4
1, 2, 3
500
200
200
4.0
µF
W
Khrs
MTBF
Weight
MIL-HDBK-217F, SF @ 70ºC
750
32
g
For Notes to Specifications, refer to page 4
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3
AMA28XXD Series
Dynamic Characteristics
Parameter
Short Circuit Recovery
Switching Frequency
3
6
-55°C
≤
TCASE
≤
+125°C, VIN = 28VDC
±5%,
C
L
= 0, unless otherwise specified.
Group A
Subgroups
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Test Conditions
0% load to 100% load
100% load
Load step 50%
Load step 0%
Min
Nom
Max
25
Unit
ms
KHz
mV pk
500
-400
-800
550
600
+400
+800
100
2000
Output Response To Step
3, 7
Transient Load Changes
Recovery Time, Step Transient
3, 7, 8
Load Changes
Output Response Transient Step
3, 6, 9
Line Changes
AMA2805D
AMA2812D
AMA2815D
Recovery Time Transient Step Line
3, 6, 9
Changes
Turn On Overshoot
3, 10
Ù
100%
Ù
50%
Load step 50%
Ù
100%
Load step 0%
Ù
50%
Input step 16
100% load
µs
4, 5, 6
4, 5, 6
4, 5, 6
Ù
40Vdc,
-550
-750
-750
+550
+750
+750
1200
mV pk
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Input step 16
⇔
40Vdc,
100% load
0% load
100% load
0% load to 100% load
µs
mV pk
600
400
25
Turn On Delay
3, 10
ms
Notes to Specifications
Applicable to positive and negative outputs.
Maximum combined output is 5.0 watts. 4.0 watts (max.) is available from either output (80%).
Load current split equally between +V
OUT
and –V
OUT
.
1.0 watt load on output under test, 1.0 watt to 4.0 watt load change on other output.
Capacitive value may be any value from 0 to the maximum limit without compromising DC performance. A
capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
6. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limit specified.
7. Load step transition time between 2 and 10 microseconds.
8. Recovery time is measured from initiation of the transient to where V
OUT
has returned to within
±1%
of
V
OUT
at 50% load.
9. Input step transient time between 1 and 10 microseconds.
10. Turn-on delay time measurement is for either a step application of power at the input or the removal of a
ground signal from the inhibit pin while power is applied to the input.
1.
2.
3.
4.
5.
4
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AMA28XXD Series
Block Diagram
+Input
6
+Output
1
Output
Return
2
-Output
3
Housekeeping
Supply
Input
Return
7
Enable
5
CS
Error
Amplifier
Case
8
Controller
Application Information
Inhibit Function (Enable)
Connecting the enable input (Pin 5) to input common
(Pin 7) will cause the converter to shut down. It is
recommended that the enable pin be driven by an
open collector device capable of sinking at least 400
µA
of current. The open circuit voltage of the inhibit
input is 10 +1.0 V
DC
.
Thermal Considerations
Irrespective of the fact that the AMA28XXD series
of converters are relatively low power devices and
are designed to provide efficient voltage
conversion, there will be some heat generated
during normal operation. To avoid a continuous
thermal rise that may eventually exceed the
maximum case temperature rating and to maintain
a safe operating environment for the internal
components, these converters should be attached
to a heat conducting surface allowing a continuous
flow of the heat away from the base plate. This
becomes more important when operating in the near
vacuum environment of space which provides no
alternate heat radiating path.
EMI Filter
An optional EMI filter is available (ASF461 or AFH461)
will reduce the input ripple current to levels below the
limits imposed by MIL-STD-461 CE03.
Radiation Specification
Parameter
Condition
MIL-STD-883, Method 1019.4
Operating bias applied during exposure
BNL Dual Van de Graf Generator
Min
25
60
Typ
—
—
Max
—
—
Unit
KRads
(Si)
MeV•cm2
/mg
Total Ionizing Dose
Heavy Ion
(Single event effects)
International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program.
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