PD-94457D
AFL50XXS SERIES
HYBRID-HIGH RELIABILITY
DC-DC CONVERTER
50V Input, Single Output
Description
The AFL Series of DC-DC converters feature high power
density with no derating over the full military temperature
range. This series is offered as part of a complete family
of converters providing single and dual output voltages
and operating from nominal+28V, +50V, +120V or +270V
inputs with output power ranging from 80W to 120W. For
applications requiring higher output power, individual converters
can be operated in parallel. The internal current sharing
circuits assure equal current distribution among the paralleled
converters. This series incorporates International Rectifier’s
proprietary magnetic pulse feedback technology providing
optimum dynamic line and load regulation response. This
feedback system samples the output voltage at the pulse
width modulator fixed clock frequency, nominally 550 kHz.
Multiple converters can be synchronized to a system clock
in the 500 kHz to 700 kHz range or to the synchronization
output of one converter. Under voltage lockout, primary
and secondary referenced inhibit, soft-start and load fault
protection are provided on all models.
These converters are hermetically packaged in two enclosure
variations, utilizing copper core pins to minimize resistive
DC losses. Three lead styles are available, each fabricated with
International Rectifier’s rugged ceramic lead-to-package
seal assuring long term hermetically in the most harsh
environments.
Manufactured in a facility fully qualified to MIL-PRF-38534, these
converters are fabricated utilizing DLA Land and Maritime
qualified processes. For available screening options, refer to
device screening table in the data sheet.
Variations in electrical, mechanical and screening specifications
can be accommodated. Contact IR HiRel San Jose for special
requirements.
AFL
Features
30V To 80V Input Range
5V, 8V, 9V, 12V, 15V and 28V Outputs Available
High Power Density - up to 84 W/in3
Up To 120W Output Power
Parallel Operation with Stress and Current Sharing
Low Profile (0.380") Seam Welded Package
Ceramic Feed thru Copper Core Pins
High Efficiency - to 85%
Full Military Temperature Range
Continuous Short Circuit and Overload Protection
Remote Sensing Terminals
Primary and Secondary Referenced Inhibit Functions
Line Rejection > 40dB - DC to 50 kHz
External Synchronization Port
Fault Tolerant Design
Dual Output Versions Available
Standard Microcircuit Drawings Available
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2016-05-11
AFL50XXS SERIES
(50V Input, Single Output)
Specifications
Absolute Maximum Ratings
Input voltage
Soldering temperature
Operating case temperature
Storage case temperature
-0.5V
DC
to +80V
DC
300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Group A
Subgroups
Static Characteristics
-55°C
≤
T
CASE
≤
+125°C, 30V
≤
V
IN
≤
80V unless otherwise specified.
Parameter
Input voltage
Output voltage
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
Output current
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
Output power
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
Maximum capacitive load
Output voltage temperature
coefficient
Output voltage regulation
AFL5028S
Line
All Others
Line
Load
Output ripple voltage
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
1
1
1
1
1
1
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
Test Conditions
Note 6
Min
30
4.95
7.92
8.91
11.88
14.85
27.72
4.90
7.84
8.82
11.76
14.70
27.44
Nom
50
5.00
8.00
9.00
12.00
15.00
28.00
Max
80
5.05
8.08
9.09
12.12
15.15
28.28
5.10
8.16
9.18
12.24
15.30
28.56
16
10
10
9.0
8.0
4.0
80
80
90
108
120
112
10,000
-0.015
-70
-20
-1.0
+0.015
+70
+20
+1.0
30
40
40
45
50
100
Unit
V
V
IN
= 50 Volts, 100% Load
V
V
IN
= 30, 50, 80 Volts - Note 6
A
Note 6
W
Note 1
V
IN
= 50 Volts, 100% Load
Notes 1, 6
1, 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
No Load, 50% Load, 100% Load
V
IN
= 30, 50, 80 Volts
F
%/°C
mV
mV
%
V
IN
= 30, 50, 80 Volts, 100% Load,
BW = 10MHz
mVpp
For Notes to Static Characteristics, refer to page 4
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2016-05-11
AFL50XXS SERIES
(50V Input, Single Output)
Static Characteristics
(Continued) -55°C < T
CASE
≤
+125°C, 30V≤ V
IN
< 80V unless otherwise specified..
Parameter
Input current
No Load
No Load
Inhibit 1
Inhibit 2
Input ripple current
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
Current limit point
As a percentage of full
rated load
Load fault power dissipation
Overload or short circuit
Efficiency
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
Enable inputs (Inhibit function)
Converter off
Sink current
Converter on
Sink current
Switching frequency
Synchronization input
Frequency range
Pulse amplitude, Hi
Pulse amplitude, Lo
Pulse rise time
Pulse duty cycle
Isolation
Device weight
MTBF
Group A
Subgroups
1
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
1, 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
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Note 1
Note 1
Input to Output or Any Pin to Case
(except Pin 3). Test @ 500V
DC
Slight Variations with Case Style
MIL-HDBK-217F, AIF @ T
C
= 40°C
300
Test Conditions
V
IN
= 50 Volts
I
OUT
= 0 (All models except
AFL5015S & AFL5028S)
I
OUT
= 0 (AFL5015S& AFL5028S)
Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8
Min
Nom
Max
50
60
60
65
5.0
5.0
60
60
60
60
60
60
115
105
125
125
115
140
32
78
79
80
81
82
82
-0.5
2.0
500
500
2.0
-0.5
20
100
85
550
81
82
83
84
85
84
0.8
100
50
100
600
700
10
0.8
100
80
Unit
mA
V
IN
= 50 Volts, 100% Load, BW = 10MHz
mApp
V
OUT
= 90% V
NOM
, V
IN
= 50 Volts
Note 5
V
IN
= 50 Volts
%
W
V
IN
= 50 Volts, 100% Load
%
Logical Low on Pin 4 or Pin 12,
Note 1
Logical High on Pin 4 and Pin 12 - Note 9
Note 1
V
A
V
A
kHz
kHz
V
V
ns
%
M
g
kHrs
1
For Notes to Static Characteristics, refer to page 4
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2016-05-11
AFL50XXS SERIES
(50V Input, Single Output)
Dynamic Characteristics
-55°C
≤
T
CASE
≤
+125°C,V
IN
= 50V unless otherwise specified.
Parameter
Load transient response
AFL5005S
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Amplitude
Recovery
Turn-on characteristics
Overshoot
Delay
Load fault recovery
Line rejection
Notes to Specifications
1. Parameters not 100% tested but are guaranteed to the limits specified in the table.
2. Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within ±1.0% of V
OUT
at 50% load.
3. Line transient transition time
100s.
4. Turn-on delay is measured with an input voltage rise time of between 100V and 500V per millisecond.
5. Current limit point is that condition of excess load causing output voltage to drop to 90% of nominal.
6. Parameter verified as part of another test.
7. All electrical tests are performed with the remote sense leads connected to the output leads at the load.
8. Load transient transition time
10s.
9. Enable inputs internally pulled high. Nominal open circuit voltage
4.0V
DC
.
Group A
Subgroups
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
Test Conditions
Notes 2, 8
Load Step 50% 100%
Load Step 10% 50%
Load Step 50% 100%
Load Step 10% 50%
Load Step 50% 100%
Load Step 10% 50%
Load Step 50% 100%
Load Step 10% 50%
Load Step 50% 100%
Load Step 10% 50%
Load Step 50% 100%
Load Step 10% 50%
Notes 1, 2, 3
V
IN
Step = 30
80 Volts
Min
-450
-450
-500
-500
-600
-600
-750
-750
-750
-750
-1200
-1200
Nom
Max
450
200
450
300
500
200
500
300
600
200
600
300
750
200
750
300
750
200
750
300
1200
200
1200
300
500
500
Unit
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
s
mV
ms
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
Line transient response
-500
4, 5, 6
4, 5, 6
V
IN
= 30, 50, 80 Volts, Note 4
Enable 1, 2 on.
(Pins 4, 12 high or open)
Same as Turn On Characteristics.
MIL-STD-461D, CS101,
30Hz to 50 kHz, Note 1
50
75
250
120
40
50
dB
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2016-05-11
AFL50XXS SERIES
(50V Input, Single Output)
Fig I. Block Diagram - AFL Single Output
+ Input 1
Input
Filter
Primary
Bias Supply
Current
Sense
Sync Output
5
Control
Sync Input 6
Case
3
FB
Enable 1 4
Output
Filter
7 +Output
10
+Sense
Error
Amp
& Ref
Share
Amplifier
Sense
Amplifier
11 Share
12 Enable 2
9
8
Return Sense
Output Return
Input Return 2
Circuit Operation and Application Information
The AFL series of converters employ a forward switched
mode converter topology. (refer to Fig I.) Operation of the
device is initiated when a DC voltage whose magnitude is
within the specified input limits is applied between pins 1
and 2. If pin 4 is enabled (at a logical 1 or open) the primary bias
supply will begin generating a regulated housekeeping
voltage bringing the circuitry on the primary side of the
converter to life. A power MOSFET is used to chop the
DC input voltage into a high frequency square wave, applying
this chopped voltage to the power transformer at the
nominal converter switching frequency. Maintaining a DC
voltage within the specified operating range at the input
assures continuous generation of the primary bias voltage.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to generate the
converter DC output voltage. An error amplifier on the secondary
side compares the output voltage to a precision reference and
generates an error signal proportional to the difference. This error
signal is magnetically coupled through the feedback transformer
into the controller section of the converter varying the
pulse width of the square wave signal driving the
MOSFET, narrowing the width if the output voltage is too
high and widening it if it is too low, thereby regulating the
output voltage.
Inhibiting Converter Output (Enable)
As an alternative to application and removal of the DC
voltage to the input, the user can control the converter
output by providing TTL compatible, positive logic signals
to either of two enable pins (pin 4 or 12). The distinction
between these two signal ports is that enable 1 (pin 4) is
referenced to the input return (pin 2) while enable 2 (pin
12) is referenced to the output return (pin 8). Thus, the
user has access to an inhibit function on either side of the
isolation barrier. Each port is internally pulled “high” so
that when not used, an open connection on both enable
pins permits normal converter operation. When their use is
desired, a logical “low” on either port will shut the converter down.
Fig. II. Enable Input Equivalent Circuit
+5.6 V
100K
Pin 4 or
Pin 12
1N4148
290K
2N3904
180K
Pin 2 or
Pin 8
Disable
Remote Sensing
Connection of the + and - sense leads at a remotely located load
permits compensation for excessive resistance between
the converter output and the load when their physical
separation could cause undesirable voltage drop. This
connection allows regulation to the placard voltage at of
application. When the remote sensing feature is not used,
the sense lead should be connected to their respective
output terminals at the converter. Fig. III. illustrates a typical
remotely sensed application.
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2016-05-11
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