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PDF AFL5009S Data sheet ( Hoja de datos )
| Número de pieza | AFL5009S | |
| Descripción | HYBRID-HIGH RELIABILITY DC/DC CONVERTER | |
| Fabricantes | IRF | |
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PD - 94457B
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
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 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 550KHz. Multiple converters can be
synchronized to a system clock in the 500KHz 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 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 hermeticity in the most harsh environments.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DSCC
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Variations in electrical, mechanical and screening can
be accommodated. Contact IR Santa Clara for special
requirements.
AFL
Features
n 30V To 80V Input Range
n
n
5HVig, h8VP,o9wV,e1r 2DVe, n1s5iVtya-nudp2t8oV8O4uWtp/uints3 Available
n Up To 120W 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 > 40dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
n Dual Output Versions Available
n Standard Microcircuit Drawings Available
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12/15/06
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1 page  
+ Input 1
Enable 1 4
Sync Output 5
Sync Input 6
Case 3
Input Return 2
Input
Filter
Primary
Bias Supply
Control
FB
Block Diagram
Figure I. AFL Single Output
AFL50XXS Series
Error
Amp
& Ref
Output
Filter
Current
Sense
Share
Amplifier
Sense
Amplifier
7 +Output
10 +Sense
11 Share
12 Enable 2
9 Return 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 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.
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. Figure III. illustrates a
typical remotely sensed application.
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.
Figure II. Enable Input Equivalent Circuit
Pin 4 or
Pin 12
1N4148
100K
290K
Pin 2 or
Pin 8
180K
+5.6 V
2N3904
Disable
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Pin Designation
Pin #
Designation
1 + Input
2 Input Return
3 Case Ground
4 Enable 1
5 Sync Output
6 Sync Input
7 + Output
8 Output Return
9 Return Sense
10 + Sense
11 Share
12 Enable 2
AFL50XXS Series
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit
Drawing Number
5962-02557
5962-02558
5962-02559
5962-02560
5962-02561
5962-02562
IR Standard
Part Number
AFL5005S
AFL5008S
AFL5009S
AFL5012S
AFL5015S
AFL5028S
www.irf.com
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