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HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
ATR28XXT SERIES
Description
G110 30 Watt Output Power
G110 Flexible Output Loading
G110 -55°C to +125°C Operation
G110 Pin Compatible with ATO
G110 0.410” Maximum Height
G110 16 to 40 VDC Input Range
G110 500 Volt Input to Output Isolation
G110 High Audio Rejection
G110 MIL-STD-704 Compatible
G110 Load Fault Protection - Short Circuit and
Overload
G110 TTL level Compatible Synchronization
Features
ATR
28V Input, Triple Output
Two grades with more limited screening are also
available for use in less demanding applications.
Variations in electrical, mechanical and screening
can be limited accomodated. Contact IR Santa
Clara with specific requirements.
The ATR28XXT Series of DC/DC converters provide
30 watts of output power over the full military
temperature range with no derating. These devices
are pin compatible with the ATO series converters but
offer twice the maximum output power in a lower profile
package. A custom CMOS ASIC pulse width modulator
operating at a nominal switching frequency of 550KHz
combined with a unique magnetic feedback reduces
circuit complexity for enhanced reliability. These
converters provide 500 volt input to output isolation
and operate in highly efficient single forward mode.
The advanced feedback design and high operating
frequency provide an extremely wide bandwidth control
loop with high gain and phase margin. This results in
fast dynamic line and load response as well as superior
audio rejection. The control loop is compensated to
provide optimum performance over the full military
temperature range and over the 16 to 40 volt input
voltage range.
These converters are protected against both continuous
output short circuits and output overload. Either load
fault condition will result in operating in a low power
dissipation foldback mode. The converters will shut
down for approximately 15 milliseconds, then attempt
to restart. This cycle will continue indefinitely unless
the load fault is corrected. Recovery to normal operation
is automatic upon removal of the load fault.
Manufactured in a facility full 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 processed
and screened to the class H requirement, but element
evaluation and Periodic Inspections (PI) are not
required. Both grades are tested to meet the complete
group “A” test specification over the full military
temperature range without output power deration.
PD-94551A