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AFL12003R3S 데이터시트 PDF




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부품번호 AFL12003R3S 기능
기능 HYBRID-HIGH RELIABILITY DC/DC CONVERTER
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AFL12003R3S 데이터시트, 핀배열, 회로
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
PD - 94448E
AFL12003R3S
120V Input, 3.3V 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 or +270V inputs with output
power ranging from 66W to 120W. For applications requiring
higher output power, multiple 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 700KHz 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 hermeticity in the most
harsh environments.
AFL
Features
n 80V To 160V Input Range
n
n
3.3V Output
High Power Density - 46W/in3
n 66W Output Power
n Parallel Operation with Stress and Current
Sharing
n Low Profile (0.380") Seam Welded Package
n Ceramic Feed thru Copper Core Pins
n High Efficiency - to 74%
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 > 50dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
n Dual Output Versions Available
n Standard Microcircuit Drawing Available
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.
www.irf.com
1
12/12/06
Free Datasheet http://www.Datasheet4U.com




AFL12003R3S pdf, 반도체, 판매, 대치품
AFL12003R3S
+ INPUT 1
INPUT
FILTER
Block Diagram
Figure I. AFL Single Output
ENABLE 1 4
SYNC OUTPUT 5
SYNC INPUT 6
CASE 3
INPUT RETURN 2
PRIMARY
BIAS SUPPLY
CONTROL
OUTPUT
FILTER
ERROR
AMP
& REF
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. 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
Connection of the + and - sense leads at a remotely located
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
respective output terminals at the converter. Figure III.
illustrates a typical 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
150K
+5.6V
Disable
2N3904
4 www.irf.com
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AFL12003R3S 전자부품, 판매, 대치품
AFL12003R3S
Input Filter
The AFL120XXS series converters incorporate a LC input
filter whose elements dominate the input load impedance
characteristic at turn-on. The input circuit is as shown in
Figure IV.
Figure IV. Input Filter Circuit
Pin 1
16.8uH
Pin 2
0.78uF
Finding a resistor value for a particular output voltage, is
simply a matter of substituting the desired output voltage
and the nominal device voltage into the equation and solving
for the corresponding resistor value.
Figure V. Connection for VOUT Adjustment
AFL120xxS
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
RADJ
To Load
Undervoltage Lockout
A minimum voltage is required at the input of the converter
to initiate operation. This voltage is set to 74V ± 4.0V. To
preclude the possibility of noise or other variations at the
input falsely initiating and halting converter operation, a
hysteresis of approximately 7.0V is incorporated in this
circuit. Thus if the input voltage droops to 67V ± 4.0V, the
converter will shut down and remain inoperative until the
input voltage returns to 74V.
Output Voltage Adjust
In addition to permitting close voltage regulation of remotely
located loads, it is possible to utilize the converter sense
pins to incrementally increase the output voltage over a
limited range. The adjustments made possible by this method
are intended as a means to “trim” the output to a voltage
setting for some particular application, but are not intended
to create an adjustable output converter. These output
voltage setting variations are obtained by connecting an
appropriate resistor value between the +sense and -sense
pins while connecting the -sense pin to the output return pin
as shown in Figure V. below. The range of adjustment and
corresponding range of resistance values can be determined
by use of the following equation.
Radj
=
100
⎧⎨⎩VOUT
-
VNOM
VNOM
-.025
⎫⎬⎭
Caution: Do not set Radj < 500
Attempts to adjust the output voltage to a value greater than
120% of nominal should be avoided because of the potential
of exceeding internal component stress ratings and
subsequent operation to failure. Under no circumstance
should the external setting resistor be made less than 500.
By remaining within this specified range of values, completely
safe operation fully within normal component derating limits
is assured.
Examination of the equation relating output voltage and
resistor value reveals a special benefit of the circuit topology
utilized for remote sensing of output voltage in the
AFL120XXS series of converters. It is apparent that as the
resistance increases, the output voltage approaches the
nominal set value of the device. In fact the calculated limiting
value of output voltage as the adjusting resistor becomes
very large is 25mV above nominal device voltage.
The consequence is that if the +sense connection is
unintentionally broken, an AFL120XXS has a fail-safe output
voltage of Vout + 25mV, where the 25mV is independent of
the nominal output voltage. It can be further demonstrated
that in the event of both the + and - sense connections
being broken, the output will be limited to Vout + 440mV.
This 440mV is also essentially constant independent of the
nominal output voltage. While operation in this condition is
not damaging to the device, not at all performance
parameters will be met.
Where VNOM = device nominal output voltage, and
VOUT = desired output voltage
www.irf.com
7
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AFL12003R3S

HYBRID-HIGH RELIABILITY DC/DC CONVERTER

International Rectifier
International Rectifier

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