PD - 94447B
AFL120XXS SERIES
ADVANCED ANALOG
HIGH RELIABILITY
HYBRID DC/DC CONVERTERS
Description
The AFL Series of DC/DC converters feature high power
density with no derating over the full military tempera-
ture range. This series is offered as part of a complete
family of converters providing single and dual output
voltages and operating from nominal +28, +50, +120 or
+270 volt inputs with output power ranging from 80 to
120 watts. For applications requiring higher output
power, multiple converters can be operated in parallel.
The internal current sharing circuits assure equal cur-
rent distribution among the paralleled converters. This
series incorporates Advanced Analog’s proprietary mag-
netic pulse feedback technology providing optimum
dynamic line and load regulation response. This feed-
back system samples the output voltage at the pulse
width modulator fixed clock frequency, nominally 550
KHz. Multiple converters can be synchronized to a sys-
tem clock in the 500 KHz to 700 KHz range or to the
synchronization output of one converter. Undervoltage
lockout, primary and secondary referenced inhibit, soft-
start and load fault protection are provided on all mod-
els.
These converters are hermetically packaged in two en-
closure variations, utilizing copper core pins to mini-
mize resistive DC losses. Three lead styles are avail-
able, each fabricated with Advanced Analog’s rugged
ceramic lead-to-package seal assuring long term
hermeticity in the most harsh environments.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are available in four screening
grades to satisfy a wide range of requirements. The CH
grade is fully compliant to the requirements of MIL-PRF-
38534 for class H. The HB grade is fully processed and
screened to the class H requirement, but does not have
material element evaluated to the class H requirement.
Both grades are tested to meet the complete group “A”
test specification over the full military temperature range
without output power deration. Two grades with more
limited screening are also available for use in less de-
120V Input, Single Output
AFL
Features
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80 To 160 Volt Input Range
High Power Density - up to 84 W / in3
Up To 120 Watt Output Power
Parallel Operation with Stress and Current
Sharing
Low Profile (0.380") Seam Welded Package
Ceramic Feedthru Copper Core Pins
High Efficiency - to 87%
Full Military Temperature Range
Continuous Short Circuit and Overload
Protection
Remote Sensing Terminals
Primary and Secondary Referenced
Inhibit Functions
Line Rejection > 50 dB - DC to 50KHz
External Synchronization Port
Fault Tolerant Design
Dual Output Versions Available
Standard Military Drawings Available
manding applications. Variations in electrical, me-
chanical and screening can be accommodated.
Contact Advanced Analog for special require-
ments.
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1
09/10/02
AFL120XXS Series
Specifications
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 180V
300°C for 10 seconds
Operating
Storage
-55°C to +125°C
-65°C to +135°C
Static Characteristics
-55°C < T
CASE
< +125°C, 80V< V
IN
< 160V
unless otherwise specified.
Parameter
INPUT VOLTAGE
OUTPUT VOLTAGE
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
OUTPUT CURRENT
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
OUTPUT POWER
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
MAXIMUM CAPACITIVE LOAD
OUTPUT VOLTAGE
TEMPERATURE COEFFICIENT
OUTPUT VOLTAGE REGULATION
AFL12028S
Line
All Others
Line
Load
OUTPUT RIPPLE VOLTAGE
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
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
VIN = 80, 120, 160 Volts, 100% Load,
BW = 10MHz
Note 1
10,000
+0.015
Note 6
80
80
90
108
120
112
W
W
W
W
W
W
µfd
%/°C
1
1
1
1
1
1
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
VIN = 80, 120, 160 Volts - Note 6
Group A
Subgroups
Note 6
VIN = 120 Volts, 100% Load
4.95
7.92
8.91
11.88
14.85
27.72
4.90
7.84
8.82
11.76
14.70
27.44
5.00
8.00
9.00
12.00
15.00
28.00
5.05
8.08
9.09
12.12
15.15
28.28
5.10
8.16
9.18
12.24
15.30
28.56
V
V
V
V
V
V
V
V
V
V
V
V
Test Conditions
Min
80
Nom
120
Max
160
Unit
V
16.0
10.0
10.0
9.0
8.0
4.0
A
A
A
A
A
A
VIN = 120 Volts, 100% Load - Note 1, 6 -0.015
No Load, 50% Load, 100% Load
VIN = 80, 120, 160 Volts
-70.0
-20.0
-1.0
+70.0
+20.0
+1.0
30
40
40
45
50
100
mV
mV
%
mVpp
mVpp
mVpp
mVpp
mVpp
mVpp
For Notes to Specifications, refer to page 4
2
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AFL120XXS Series
Static Characteristics
(Continued)
Parameter
INPUT CURRENT
No Load
Inhibit 1
Inhibit 2
INPUT RIPPLE CURRENT
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
CURRENT LIMIT POINT
As a percentage of full rated load
1
2, 3
1, 2, 3
1, 2, 3
1,
1,
1,
1,
1,
1,
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
Group A
Subgroups
Test Conditions
VIN = 120 Volts
IOUT = 0
Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8
VIN = 120 Volts, 100% Load, BW =
10MHz
Min
Nom
Max
Unit
30
40
3.0
5.0
60
60
60
60
60
60
mA
mA
mA
mA
mApp
mApp
mApp
mApp
mApp
mApp
1
2
3
1, 2, 3
VOUT = 90% VNOM , VIN = 120 Volts
Note 5
115
105
125
125
115
140
32
%
%
%
W
LOAD FAULT POWER
DISSIPATION
Overload or Short Circuit
EFFICIENCY
AFL12005S
AFL12008S
AFL12009S
AFL12012S
AFL12015S
AFL12028S
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
V
IN
= 120 Volts
V
IN
= 120 Volts, 100% Load
1,
1,
1,
1,
1,
1,
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
Logical Low on Pin 4 or Pin 12
Note 1
Logical High on Pin 4 and Pin 12 - Note 9
Note 1
78
79
80
82
83
82
-0.5
2.0
82
83
84
85
87
85
0.8
100
50
100
550
600
700
10
0.8
100
80
%
%
%
%
%
%
V
µA
V
µA
KHz
KHz
V
V
nSec
%
MΩ
85
300
gms
KHrs
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Note 1
Note 1
1
Input to Output or Any Pin to Case
(except Pin 3). Test @ 500VDC
Slight Variations with Case Style
MIL-HDBK-217F, AIF @ TC = 70°C
500
500
2.0
-0.5
20
100
For Notes to Specifications, refer to page 4
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3
AFL120XXS Series
Dynamic Characteristics
-55°C < T
CASE
< +125°C, V
IN
=120V
unless otherwise specified.
Parameter
LOAD TRANSIENT RESPONSE
AFL12005S
Amplitude
Recovery
Amplitude
Recovery
AFL12008S
Amplitude
Recovery
Amplitude
Recovery
AFL12009S
Amplitude
Recovery
Amplitude
Recovery
AFL12012S
Amplitude
Recovery
Amplitude
Recovery
AFL12015S
Amplitude
Recovery
Amplitude
Recovery
AFL12028S
Amplitude
Recovery
Amplitude
Recovery
LINE TRANSIENT RESPONSE
Amplitude
Recovery
TURN-ON CHARACTERISTICS
Overshoot
Delay
LOAD FAULT RECOVERY
LINE REJECTION
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
4, 5, 6
4, 5, 6
Group A
Subgroups
Note 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%
Note 1, 2, 3
VIN Step = 80
⇔
160 Volts
VIN = 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
50KHz
Note 1
50
60
dB
50
75
250
120
mV
mSec
-500
500
500
mV
µSec
-450
-450
-500
-500
-600
-600
-750
-750
-750
-750
-1200
-1200
450
200
450
400
500
200
500
400
600
200
600
400
750
200
750
400
750
200
750
400
1200
200
1200
400
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
mV
µSec
Test Conditions
Min
Nom
Max
Unit
Notes to Specifications:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Parameters not 100% tested but are guaranteed to the limits specified in the table.
Recovery time is measured from the initiation of the transient to where V
OUT
has returned to within
±1%
of V
OUT
at 50% load.
Line transient transition time
≥
100
µSec.
Turn-on delay is measured with an input voltage rise time of between 100 and 500 volts per millisecond.
Current limit point is that condition of excess load causing output voltage to drop to 90% of nominal.
Parameter verified as part of another test.
All electrical tests are performed with the remote sense leads connected to the output leads at the load.
Load transient transition time
≥
10
µSec.
Enable inputs internally pulled high. Nominal open circuit voltage
≈
4.0VDC.
4
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AFL120XXS Series
AFL120XXS Circuit Description
Figure I. AFL Single Output Block Diagram
DC Input 1
Input
Filter
Output
Filter
Current
Sense
Sync Output
5
Control
Sync Input 6
FB
Enable 1 4
Primary
Bias Supply
7
10
+Output
+Sense
Error
Amp
& Ref
Share
Amplifier
Sense
Amplifier
11 Share
12 Enable 2
9
8
-Sense
Output Return
Case
3
Input Return 2
Circuit Operation and Application Information
The AFL series of converters employ a forward switched
mode converter topology. (refer to Figure 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 nomi-
nal converter switching frequency. Maintaining a DC volt-
age within the specified operating range at the input as-
sures 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 sec-
ondary 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 volt-
age is too high and widening it if it is too low, thereby regulat-
ing the output voltage.
terminals at the converter. Figure III. illustrates a typical
remotely sensed application.
Inhibiting Converter Output
As an alternative to application and removal of the DC volt-
age 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 refer-
enced 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 nor-
mal converter operation. When their use is desired, a logi-
cal “low” on either port will shut the converter down.
Figure II. Enable Input Equivalent Circuit
+5.6V
100K
Pin 4 or
Pin 12
1N4148
Remote Sensing
Connection of the
+
and
-
sense leads at a remotely located
load permits compensation for excessive resistance be-
tween the converter output and the load when their physical
separation could cause undesirable voltage drop. This con-
nection allows regulation to the placard voltage at the point
of application. When the remote sensing feature is not used,
the sense should be connected to their respective output
290K
2N3904
150K
Pin 2 or
Pin 8
Disable
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