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PDF AFL12003R3S Data sheet ( Hoja de datos )
| Número de pieza | AFL12003R3S | |
| Descripción | HYBRID-HIGH RELIABILITY DC/DC CONVERTER | |
| Fabricantes | International Rectifier | |
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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
1 page  
AFL12003R3S
Internally, these ports differ slightly in their function. In use,
a low on Enable 1 completely shuts down all circuits in the
converter while a low on Enable 2 shuts down the secondary
side while altering the controller duty cycle to near zero.
Externally, the use of either port is transparent to the user
save for minor differences in idle current. (See specification
table).
Synchronization of Multiple Converters
When operating multiple converters, system requirements
often dictate operation of the converters at a common
frequency. To accommodate this requirement, the AFL
series converters provide both a synchronization input and
output.
The sync input port permits synchronization of an AFL
converter to any compatible external frequency source
oper- ating between 500KHz and 700KHz. This input signal
should be referenced to the input return and have a 10% to
90% duty cycle. Compatibility requires transition times less
than100 ns, maximum low level of +0.8V and a minimum
high level of +2.0V. The sync output of another converter
which has been designated as the master oscillator provides
a convenient frequency source for this mode of operation.
When external synchronization is not required, the sync in
pin should be left unconnected thereby permitting the
converter to operate at its’ own internally set frequency.
The sync output signal is a continuous pulse train set at
550 ± 50KHz, with a duty cycle of 15 ± 5.0%. This signal is
referenced to the input return and has been tailored to be
compatible with the AFL sync input port. Transition times
are less than 100ns and the low level output impedance is
less than 50Ω. This signal is active when the DC input
voltage is within the specified operating range and the
converter is not inhibited. This output has adequate drive
reserve to synchronize at least five additional converters.
A typical synchronization connection option is illustrated in
Figure III.
Figure III. Preferred Connection for Parallel Operation
Power
Input
Optional
Synchronization
Connection
1
Vin
Rtn
Case
Enable 1
Sync Out
Sync In
6
AFL
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
12
7
1
Vin
Rtn
Case
Enable 1
Sync Out
Sync In
6
AFL
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
12
7
Share Bus
1
Vin
Rtn
Case
Enable 1
Sync Out
Sync In
6
AFL
Enable 2
Share
+ Sense
- Sense
Return
+ Vout
12
7
to Load
(Other Converters)
Parallel Operation-Current and Stress Sharing
Figure III. illustrates the preferred connection scheme for
operation of a set of AFL converters with outputs operating
in parallel. Use of this connection permits equal sharing of
a load current exceeding the capacity of an individual AFL
among the members of the set. An important feature of the
AFL series operating in the parallel mode is that in addition
to sharing the current, the stress induced by temperature
will also be shared. Thus if one member of a paralleled set
is operating at a higher case temperture, the current it
provides to the load will be reduced as compensation for
the temperature induced stress on that device.
www.irf.com
5
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