PD - 94540
ASA28XXD SERIES
ADVANCED ANALOG
HIGH RELIABILITY
HYBRID DC/DC CONVERTERS
Description
The ASA28XXD Series of DC/DC converters are high
reliability thick film hybrid converters that use flyback
topology operating at a nominal frequency of 550Khz.
High input to output isolation is achieved through the
use of transformers in the flyback power and feedback
circuits.
The advanced feedback design provides fast loop re-
sponse for superior line and load transient characteris-
tics and offers greater reliability than devices incorpo-
rating optical feedback circuits.
This device is designed to meet MIL-STD-704 input
requirements offering full performance over a 16 to 40
volt input range. Output Power of up to 5 watts is avail-
able for either balanced or unbalanced loads.
Connecting the inhibit pin (pin 5) to the input common
(pin 7) will cause the converter to shut down. It is rec-
ommended that the inhibit pin be driven by an open
collector device capable of sinking at least 400碌A(chǔ). The
open circuit voltage of the inhibit pin is 11.5 鹵0.5 volts.
These converters are manufactured in a facility fully
qualified to MIL-PRF-38534. All processes used to
manufacture these converters have been qualified to
enable Advanced Analog to deliver compliant devices.
Three standard temperature grades are offered with
the screening options. Refer to Part Number section.
The CH grade converters are fully compliant to MIL-
PRF-38534 for class H. The HB grade converters are
processed with the same screening as the CH grade,
but do not have class H element evaluation as required
by MIL-PRF-38534. These two grades are fully tested
and operate over the full military temperature range
without derating of output power. A commercial grade
is also available. Variations in electrical, mechanical
and screening can be accommodated. Extensive com-
puter simulation using complex modeling enables rapid
28V Input, Dual Output
ASA
Features
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Up To 5 Watt Output Power
鹵
5,
鹵
12,
鹵
15 Volts Outputs
High Reliability
Wide Input Voltage Range -16 To 40 Volts
Indefinite Short Circuit and Overload
Protection
Popular Industry Standard Pin-Out
Military Screening
Parallel Seam Welded Package
No External Capacitors Required
Input Voltage Surge Protected to
MIL-STD-704
Under Voltage Lockout
design modification to be provided. Contact
Advanced Analog with specific requirements.
www.irf.com
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