PD - 94528A
AFL503R3S
50V Input, 3.3V Output
ADVANCED ANALOG
HIGH RELIABILITY
HYBRID DC/DC CONVERTER
Description
The AFL Series of DC/DC converters feature high power
density with no derating over the full military tempera-
ture 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 in-
put voltage range of 28 to 270 volts with output power
ranging from 66 to 120 watts. For applications requir-
ing higher output power, multiple converters can be op-
erated in parallel. The internal current sharing circuits
assure equal current distribution among the paralleled
converters. This series incorporates Advanced Analog’s
proprietary magnetic pulse feedback technology pro-
viding optimum dynamic line and load regulation re-
sponse. This feedback system samples the output volt-
age at the pulse width modulator fixed clock frequency,
nominally 550 KHz. Multiple converters can be synchro-
nized 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 refer-
enced inhibit, soft-start and load fault protection are pro-
vided on all models.
AFL
Features
n 30 To 80 Volt Input Range
n 3.3 Volt Output
n High Power Density - 50 W/in
n 66 Watt Output Power
n Parallel Operation with Stress and Current
Sharing
n Low Profile (0.380") Seam Welded Package
n Ceramic Feedthru Copper Core Pins
n High Efficiency - to 74%
3
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 > 40 dB - DC to 50KHz
n External Synchronization Port
n Fault Tolerant Design
These converters are hermetically packaged in two en-
closure variations, utilizing copper core pins to mini-
mize resistive DC losses. Three lead styles are avail-
able, each fabricated using Advanced Analog’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 de-
manding applications. Variations in electrical, me-
chanical and screening can be accommodated.
Contact Advanced Analog for special require-
ments.
www.irf.com
1
10/04/02
INFINEON [ Infineon ]
