PD - 94528C
AFL5003R3S
50V Input, 3.3V Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
Description
The AFL Series of DC/DC converters feature high power
density with no derating over the full military temperature
range. This device is offered as part of a complete family
of converters providing single and dual output voltages
originally created to operate over a broad input voltage
range of 28V to 270V 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 550
KHz. 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.
AFL
Features
n 30V To 80V Input Range
n 3.3V Output
n High Power Density - 50W/in
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
3
n Line Rejection > 40dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
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 using 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.
www.irf.com
1
12/12/06
INFINEON [ Infineon ]
