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PDF AFL50xxS Data sheet ( Hoja de datos )
| Número de pieza | AFL50xxS | |
| Descripción | ADVANCED ANALOG HIGH RELIABILITY HYBRID DC/DC CONVERTERS | |
| Fabricantes | International Rectifier | |
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PD - 94457A
ADVANCED ANALOG
HIGH RELIABILITY
HYBRID DC/DC CONVERTERS
AFL50XXS SERIES
50V Input, Single Output
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, individual converters can be operated in paral-
lel. The internal current sharing circuits assure equal
current 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-H-
38534 for class H. The HB grade is fully processed and
screened to the class H requirement, may not neces-
sarily meet all of the other MIL-PRF-38534 requirements,
e.g., element evaluation and Periodic Inspection (P.I.)
not required. Both grades are tested to meet the com-
plete group “A” test specification over the full military
AFL
Features
n 30 To 80 Volt Input Range
n 3.3, 5, 8, 9 12, 15, 24 and 28 Volts Outputs
Available
n High Power Density - up to 84 W / in3
n Up To 120 Watt Output Power
n Parallel Operation with Stress and Current
Sharing
n Low Profile (0.380") Seam Welded Package
n Ceramic Feedthru Copper Core Pins
n High Efficiency - to 85%
n Full Military Temperature Range
n Continuous Short Circuit and Overload
Protection
n Remote Sensing Terminals
n Primary and Secondary Referenced
Inhibit Functions
n Line Rejection > 40 dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
n Dual Output Versions Available
n Standard Military Drawings Available
temperature range without output power deration.
Two grades with more limited screening are also
available for use in less demanding applications.
Variations in electrical, mechanical and screen-
ing can be accommodated. Contact Advanced
Analog for special requirements.
www.irf.com
1
07/09/02
1 page  
AFL50XXS Circuit Description
Figure I. AFL Single Output Block Diagram
AFL50XXS Series
DC Input 1
Enable 1 4
Input
Filter
Primary
Bias Supply
Sync Output 5
Sync Input 6
Case 3
Input Return 2
Control
FB
Error
Amp
& Ref
Output
Filter
Current
Sense
Share
Amplifier
Sense
Amplifier
7 +Output
10 +Sense
11 Share
12 Enable 2
9 -Sense
8 Output Return
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.
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 lead should be connected to their respective
output 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
Pin 4 or
Pin 12
1N4148
100K
290K
Pin 2 or
Pin 8
180K
+5.6 V
2N3904
D is a b le
www.irf.com
5
5 Page 
AFL50XXS Series
Available Screening Levels and Process Variations for AFL50XXS Series.
Requirement
Temperature Range
Element Evaluation
Internal Visual
Temperature Cycle
Constant Acceleration
Burn-in
Final Electrical (Group A)
Seal, Fine & Gross
External Visual
* per Commercial Standards
MIL-STD-883
Method
No
Suffix
-20°C to +85°C
2017
1010
2001,
1015
MIL-PRF-38534
1014
2009
¬
48hrs @ 85°C
25°C
¬
¬
ES
Suffix
-55°C to +125°C
Yes
Cond B
500g
48hrs @ 125°C
25°C
Cond A, C
Yes
HB
Suffix
-55°C to +125°C
Yes
Cond C
Cond A
160hrs @ 125°C
-55, +25, +125°C
Cond A, C
Yes
CH
Suffix
-55°C to +125°C
MIL-PRF-38534
Yes
Cond C
Cond A
160hrs @ 125°C
-55, +25, +125°C
Cond A, C
Yes
AFL50XXS Pin Designation
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
Designation
Positive Input
Input Return
Case
Enable 1
Sync Output
Sync Input
Positive Output
Output Return
Return Sense
Positive Sense
Share
Enable 2
Part Numbering
AFL 50 05 S X / CH
Mode
Input
28= 28 V, 50= 50 V
120=120 V, 270= 270 V
Output
3R3= 3.3 V, 05= 5 V
08= 8 V, 09= 9 V
12= 12 V, 15= 15 V
24= 24 V, 28= 28 V
Case
W, X, Y, Z
Output
S = Single
D = Dual
Screenin
– , ES
HB, CH
www.irf.com
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331
ADVANCED ANALOG: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 07/02
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AFL50xxS.PDF ] | |
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