PD-94689D
AMF28XXS SERIES
HYBRID - HIGH RELIABILITY
RADIATION TOLERANT
DC-DC CONVERTER
Description
The AMF28XXS 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 ART, ARH and G-Series
converters. 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 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
mechanical security than traditional packages.
International Rectifier’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.
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. Applicable
generic lot qualification test data including radiation
performance can be made available on request. Consult
IR San Jose for special requirements.
28V Input, Single Output
AMF
Features
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12Watts Output Power
Available in 3.3, 5, 7.5, 12 and 15Volt Outputs
16 - 40VDC Input Range (28VDC Nominal)
Low Input/Output Noise
Total Ionizing Dose > 25KRads (Si)
2
SEE Hardened to LET up to 60MeV
.
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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Standard Microcircuit Drawings Available
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1
02/07/13
AMF28XXS Series
(28V Input, Single Output)
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
Recommended Operating Conditions
Input Voltage range
Output Power
Operating case temperature
+16V to +40VDC
Less than or equal to 12W
-55°C to +125°C
Static Characteristics
Parameter
Input Voltage
Output Voltage
-55°C
≤
TCASE
≤
+125°C, VIN = 28V DC
±5%,
C
L
= 0, unless otherwise specified.
Group A
Subgroups
Test Conditions
Min
16
Nom
28
Max
40
Unit
V
Vin = 28 Volts, 0% load
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
1
1
1
1
1
2, 3
2, 3
2, 3
2, 3
2, 3
Vin = 16, 28, 40 Volts
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 16, 28, and 40 Vdc
AMF2803R3S
All Others
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 16, 28, 40 Volts,
BW = 20 Hz to 2 MHz
Vin = 16, 28, 40 Volts
Iout = 0%, 50%, and 100%
max
25
10
12
60
W
0
0
0
0
0
3000
2400
1600
1000
800
mA
3.25
4.95
6.97
11.88
14.85
3.20
4.90
7.35
11.76
14.70
3.30
5.00
7.50
12.00
15.00
3.35
5.05
7.58
12.12
15.15
3.40
5.10
7.65
12.24
15.30
V
Output Current
1
Output Power
1
Output Ripple Voltage
2
mV
PP
Output Voltage
Regulation
Line
AMF2803R3S
AMF2805S
AMF2807R5S
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
For Notes to Specifications, refer to page 5
2
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AMF28XXS Series
(28V Input, Single Output)
Static Characteristics
(Continued)
Parameter
Input Current
No Load
-55°C
≤
TCASE
≤
+125°C, VIN = 28 VDC
±5%,
C
L
= 0, unless otherwise specified.
Group A
Subgroups
1, 2, 3
Test Conditions
Vin = 28V,
Iout = 0, Inhibit (pin 1) = open
(AMF2812S and AMF2815S)
(All other Models)
Inhibit (pin 1) shorted to input
return (pin 7) (All Models)
Vin = 16, 28, 40 Volts, 100%
load, BW = 20 Hz to 2 MHz
Min
Nom
Max
Unit
30
20
8.0
20
50
30
12
50
mA
Inhibit
Input Ripple Current
1, 2, 3
1, 2, 3
mA
PP
Efficiency
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Isolation
3, 4
1
1, 3
1, 3
1, 3
1, 3
2, 3
2
2
2
2
1
100% load
71
76
77
78
78
70
72
73
75
75
%
Input to output or any pin to
case (except pin 6) at 500Vdc
100
MΩ
Capacitive Load
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Short Circuit Power Dissipation
Short Circuit Recovery
Switching Frequency
MTBF
4
4
4
4
4
4
1, 2, 3
4, 5, 6
4, 5, 6
No effect on dc performance
500
500
300
200
200
7.0
6.0
20
500
750
550
600
µF
AMF2803R3S
All other Models
0% load to 100% Load
100% load
MIL-HDBK-217F
SF @ Tc = 35ºC
W
ms
KHz
Khr
Weight
36
g
For Notes to Specifications, refer to page 5
www.irf.com
3
AMF28XXS Series
(28V Input, Single Output)
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
5
Transient Load Changes
All
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Recovery Time, Step Transient
5, 6
Load Changes
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
All
Output Response Transient Step
4, 7
Line Changes
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Recovery Time Transient Step
Line Changes
4, 7
Turn On Overshoot
8
-55°C
≤
TCASE
≤
+125°C, VIN = 28 V DC
±5%,
C
L
= 0, unless otherwise specified.
Group A
Subgroups
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
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Ù
100%
Load step 0%
Ù
50%
Load step 50%
-300
-400
-500
-750
-750
-750
+300
+400
+500
+750
+750
+750
mV
pk
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Load step 50%
Ù
100%
Load step 0%
Ù
50%
-500
-500
-1200
-1500
-1500
70
70
100
100
100
2.0
µs
ms
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Input step 16
⇔
40Vdc
100% Load
+500
+500
+1200
+1500
+1500
800
mV
pk
Input step 16
⇔
40Vdc, 100%
load
µs
AMF2803R3S
AMF2805S
AMF2807R5S
AMF2812S
AMF2815S
Turn On Delay
8
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
0% load to 100% load
400
600
600
600
750
20
mV
pk
0% load to 100% load
ms
For Notes to Specifications, refer to page 5
4
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AMF28XXS Series
(28V Input, Single Output)
Notes to Specifications
1 Parameter guaranteed by line and load regulation tests.
2 Bandwidth guaranteed by design. Tested for 20Hz to 2.0MHz.
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 2.0 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 1.0 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.
Block Diagram
8
+Input
Under-Voltage
Detector
EMI
Filter
+Output
3
Output
Return
Primary
Housekeeping
Supply
4
1
Enable
6
Case
2
Drive
Sync
Input
Input
Return
7
Pulse Width
FB
Modulator
CS
Error
Amp &
Ref
Application Information
Inhibit Function (Enable)
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
enable input is 10 +1.0 VDC.
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
switching 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 telemetry). Interenational Rectifier 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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