PD - 94689
AMF28XXS SERIES
ADVANCED ANALOG
RADIATION TOLERANT
DC/DC CONVERTERS
Description
The AMF28XXS series of DC/DC converter modules
has been specifically designed for operation in moder-
ate radiation environments supplementing the higher
radiation performance available in the Advanced Ana-
log ART, ARH and G-Series converters. Environ-
ments 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 hard-
ness performance will be optimally served by the
AMF28XXS Series.
The physical configuration of the AMF28XXS series
permits mounting directly to a heat dissipation surface
without the necessity of signal leads penetrating the
heat sink surface. This package configuration permits
greater independence in mounting and more mechani-
cal security than traditional packages. Advanced
Analog’s rugged ceramic seal pins are used exclusively
in the package thereby assuring long term hermeticity.
The AMF28XXS has been designed for high density
using chip and wire hybrid technology that complies
with the class H requirements of MIL-PRF-38534. Fin-
ished product are fabricated in a facility fully qualified
to MIL-PRF-38534. The standard processing adopted
for the AMF28XXS meets the requirements of MIL-PRF-
38534 for class H but with enhanced screening steps
and includes element evaluation. Applicable generic
lot qualification test data including radiation perfor-
mance can be made available on request. Consult
Advanced Analog for special requirements.
28V Input, Single Output
AMF
Features
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12 Watts Output Power
Available in 3.3, 5, 12 and 15 Volt Outputs
16 - 40 VDC Input Range (28 VDC Nominal)
Low Input/Output Noise
Total Ionizing Dose > 25KRads (Si)
2
No SEE to LET > 60 MeV-cm /mg
-55°C to +125°C Operating Range
Indefinite Short Circuit Protection
Flexible Mounting
High Power Density
Fully Isolated - Input to Output and to Case
Complimentary EMI Filter Available
Synchronizable From An External Source
Electrical Performance Similar to
AHF28XXS Series
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1
07/25/03
AMF28XXS Series
Specifications
Absolute Maximum Ratings
Input Voltage Range
Soldering Temperature
Storage Case Temperature
-0.5V to +50VDC
300°C for 10 seconds
65°C to +135°C
+16V to +40VDC
Less than or equal to 12W
-55°C to +125°C
Recommended Operating Ratings
Input Voltage Range
Output Power
Operating Case Temperature
Static Characteristics
-55°C
≤
TCASE
≤
+125°C, VIN=28 VDC
±5%,
C
L
=0,
unless otherwise specified.
Parameter
Input Voltage
Output Voltage
AMF2803R3S
AMF2805S
AMF2807R5SS
AMF2812S
AMF2815S
AMF2803R3S
AMF2805S
AMF2807R5SS
AMF2812S
AMF2815S
Output Current
1
Group A
Subgroups
Test Conditions
Min
16
Nom
28
3.30
5.00
7.50
12.00
15.00
Max
40
3.35
5.05
7.58
12.12
15.15
3.40
5.10
7.65
12.24
15.30
3000
2400
1600
1000
800
10
12
Unit
V
V
V
V
V
V
V
V
V
V
V
mA
mA
mA
mA
mA
W
W
mV
PP
1
1
1
1
1
2, 3
2, 3
2, 3
2, 3
2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 28 Volts, 0% load
3.25
4.95
6.97
11.88
14.85
3.20
4.90
7.35
11.76
14.70
AMF2803R3S
AMF2805S
AMF2807R5SS
AMF2812S
AMF2815S
AMF2803R3S
All Others
2
Vin = 16, 28, 40 Volts
0
0
0
0
0
Output Power
1
Vin = 16, 28, and 40 V dc
Output Ripple Voltage
Vin = 16, 28, 40 Volts,
BW = 20 Hz to 2 MHz
Vin = 16, 28, 40 Volts
Iout = 0%, 50%, and 100%
max
25
60
Output Voltage
Regulation
Line
Line
AMF2803R3S
AMF2805S
AMF2807R5SSS
AMF2812S
AMF2815S
Load
All
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
10
10
10
10
10
10
25
25
50
50
50
50
mV
mV
mV
mV
mV
mV
For Notes to Specifications, refer to page 5
2
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AMF28XXS Series
Static Characteristics
Parameter
Input Current
No Load
Inhibit
Input Ripple Current
Efficiency
(Continued)
-55°C
≤
TCASE
≤
+125°C, VIN=28 VDC
±5%,
C
L
=0, unless otherwise specified.
Group A
Subgroups
1, 2, 3
1, 2, 3
Test Conditions
Vin=28V,
Iout=0, Inhibit (pin 1)=open
Inhibit (pin 1) shorted to input
return (pin 7)
Vin = 16, 28, 40 Volts, 100%
load, BW = 20 Hz to 2 MHz
100% load
Min
Nom
20
8
Max
30
12
Unit
mA
mA
1, 2, 3
1, 3
1, 3
1, 3
1, 3
1, 3
2
2
2
2
2
1
20
72
76
77
78
78
70
72
73
75
75
50
mA
PP
%
%
%
%
%
%
%
%
%
%
MΩ
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Isolation
Capacitive Load
3, 4
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Short Circuit Power Dissipation
Short Circuit Recovery
4
Input to output or any pin to
case (except pin 6) at 500Vdc
100
4
4
4
4
4
1, 2, 3
No effect on dc performance
500
500
300
200
200
6
µF
µF
µF
µF
µF
watts
4, 5, 6
Switching Frequency
MTBF
Weight
4, 5, 6
0% load to 100% Load
100% load
MIL-HDBK-217F
SF @ Tc = 35°C
500
750
550
20
600
ms
KHz
Khrs
36
g
For Notes to Specifications, refer to page 5
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3
AMF28XXS Series
Dynamic Characteristics
Parameter
Synchronization Input
Frequency Range
Pulse Amplitude, Hi
4
Pulse Amplitude, Lo
4
Pulse Rise time
4
Pulse Duty Cycle
4
Output Response To Step
Transient Load Changes
5
-55°C
≤
TCASE
≤
+125°C, VIN=28 VDC
±5%,
C
L
=0, unless otherwise specified.
Subgroups
Group A
Test Conditions
Min
500
2.5
-0.5
20
Nom
Max
700
10
0.8
100
80
Unit
KHz
V
V
ns
%
4, 5, 6
All
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Load step 50%ó100%
Load step 0%
ó50%
-300
-400
-500
-750
-750
-750
+300
+400
+500
+750
+750
+750
mV
pk
mV
pk
mV pk
mV pk
mV pk
mV
pk
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Recovery Time, Step Transient
Load Changes
5, 6
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
All
Output Response Transient Step
Line Changes
4, 7
AMF2803R3S
AMF2805S
AMF2807R5SS
AMF2812S
AMF2815S
Recovery Time Transient Step Line
Changes
4, 7
Turn On Overshoot
8
AMF2803R3S
AMF2805S
AMF2807R5SS
AMF2812S
AMF2815S
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Load step 50%ó100%
70
70
100
100
100
2
µS
µs
µs
µs
µs
mS
Load step 0%
ó
50%
Input step 16
⇔
40Vdc
100% Load
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
-500
-500
-1200
-1500
-1500
+500
+500
+1200
+1500
+1500
800
mV
pk
mV
pk
mV
pk
mV
pk
mV
pk
µs
Input step 16
⇔
40Vdc, 100%
load
0% load to 100% load
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
400
600
600
600
750
20
mV
pk
mV
pk
mV
pk
mV
pk
mV
pk
ms
Turn On Delay
8
0% load to 100% load
For Notes to Specifications, refer to page 5
4
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AMF28XXS Series
Notes to Specifications
1 Parameter guaranteed by line and load regulation tests.
2 Bandwidth guaranteed by design. Tested for 20 Hz to 2 MHz.
3 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 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.
4 Parameter shall be tested as part of design characterization and after design or process changes. Therefore this Parameters shall
be guaranteed to the limit specified.
5 Load step transition time between 2 and 10 microseconds.
6 Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1 % of V
OUT
at 50 percent load.
7 Input step transition time between 1 and 10 microseconds. Parameter guaranteed by design but not 100% tested.
8 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.
AMF28XXS Block Diagram
8
+Input
EMI
Filter
U nder-V oltage
D etector
3
+V out
1
E nable
6
P rim ary
H ousekeeping
S upply
4
R eturn
C ase
2
D rive
S ync
P ulse W idth
FB
M odulator
CS
E rror
Amp &
R ef
Input
R eturn
7
Application Information
Inhibit Function
Connecting the enable input (Pin 1) 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 en-
able input is 10.0 +1 V
DC
.
Device Synchronization
When multiple DC/DC converters are utilized in a
single system, significant low frequency noise may
be generated due to a small difference in the switch-
ing frequency of the converters (beat frequency
noise). Because of the low frequency nature of this
noise (typically less than 10 KHz), it is difficult to
filter out and may interfere with proper operation of
sensitive systems (communication, radar or telem-
etry). Advanced Analog provides synchronization
of multiple AMF type converters to match switching
frequency of the converter to the frequency of the
system clock, thus eliminating this type of noise.
EMI Filter
An optional EMI filter is available (AFH461) that will
reduce the input ripple current to levels below the
limits imposed by MIL-STD-461 CE03.
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