G48G57G47G48G49G47G48G52
www.irf.com 1
HIGH RELIABILITY
HYBRID DC/DC CONVERTER
AFL27003R3S
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 +28 or +270 volt inputs with
output power ranging from 80 to 120 watts. 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 500 KHz 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 available in four screening
grades to satisfy a wide range of requirements. The CH
grade is fully compliant to the requirements of MIL-PRF-
38534 for class H. The HB grade is fully processed and
screened to the class H requirement, but does not have
material element evaluated to the class H requirement.
Both grades are tested to meet the complete group “A”
test specification over the full military temperature range
without output power deration. Two grades with more
limited screening are also available for use in less
Description
demanding applications. Variations in electrical,
mechanical and screening can be accommodated.
Contact IR Santa Clara for special requirements.
G110 160 To 400 Volt Input Range
G110 3.3 Volt Output
G110 High Power Density - 46 W / in
3
G110 66 Watt Output Power
G110 Parallel Operation with Stress and Current
Sharing
G110 Low Profile (0.380") Seam Welded Package
G110 Ceramic Feedthru Copper Core Pins
G110 High Efficiency - to 74%
G110 Full Military Temperature Range
G110 Continuous Short Circuit and Overload
Protection
G110 Remote Sensing Terminals
G110 Primary and Secondary Referenced
Inhibit Functions
G110 Line Rejection > 60 dB - DC to 50KHz
G110 External Synchronization Port
G110 Fault Tolerant Design
G110 Dual Output Versions Available
G110 Standard Military Drawings Available
Features
AFL
270V Input, 3.3V Output
PD - 94462E