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AFL2803R3SZCH Datasheet(PDF) 4 Page - International Rectifier

Part # AFL2803R3SZCH
Description  HYBRID-HIGH RELIABILITY DC/DC CONVERTER
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

AFL2803R3SZCH Datasheet(HTML) 4 Page - International Rectifier

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AFL2803R3S
Block Diagram
Figure I. Single Output
Connection of the + and - sense leads at a remotely locat-
led load permits compensation for resistive voltage drop
between the converter output and the load when they are
physically separated by a significant distance. This
connection allows regulation to the placard voltage at the
point of application.When the remote sensing features is
not used, the sense leads should be connected to their
Figure II. Enable Input Equivalent Circuit
Pin 4 or
Pin 12
1N4148
100K
290K
150K
2N3904
+5.6V
Disable
Pin 2 or
Pin 8
respective output terminals at the converter.
Figure III. illustrates a typical application.
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. Two power MOSFETs used to chop the
DC input voltage into a high frequency square wave, apply
this chopped voltage to the power transformer. As this
switching is initiated, a voltage is impressed on a second
winding of the power transformer which is then rectified and
applied to the primary bias supply. When this occurs, the
input voltage is shut out and the primary bias voltage
becomes exclusively internally generated.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to provide the
converter 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 MOSFETs, narrowing the width if the output
voltage is too high and widening it if it is too low.
Remote Sensing
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.
1
+ Input
Enable 1 4
Sync Output 5
6
Sync Input
Case
3
2
Input Return
Input
Filter
Primary
Bias Supply
Control
FB
Output
Filter
Current
Sense
Error
Amp
& Ref
Share
Amplifier
Sense
Amplifier
7 +Output
10 +Sense
11 Share
12 Enable 2
9
Sense Return
8
Output Return


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