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AHF28XX_10

Description
HYBRID-HIGH RELIABILITY DC-DC CONVERTER
File Size223KB,19 Pages
ManufacturerInternational Rectifier ( Infineon )
Websitehttp://www.irf.com/
Download Datasheet View All

AHF28XX_10 Overview

HYBRID-HIGH RELIABILITY DC-DC CONVERTER

PD-94541D
AHF28XX SERIES
28V Input, Single and Dual Output
HYBRID-HIGH RELIABILITY
DC-DC CONVERTER
Description
The AHF Series of DC-DC converters feature single or
dual outputs over the full military temperature range.
No derating in output power is required, making them
suitable for use in rugged military applications. The
low profile, small outline package is ideally suited to
the tight board space requirements of many industrial
and aerospace applications. Designed for nominal
28Vdc inputs, this family of converters will meet the
requirements of MIL-STD-704D. The basic circuit
utilizes a pulse width modulated, feed-forward topology
at a nominal switching frequency of 550KHz. Input to
output isolation is achieved through the use of
transformers in the forward and feedback circuits.
The proprietary magnetic feedback circuit provides for
an extremely wide bandwidth control loop with a high
phase margin. The closed loop frequency response of
this converter family extends to approximately 50KHz,
resulting in superior line and load transient characteristics.
This feedback method is also inherently temperature
and radiation insensitive. This gives the AHF Series
an important advantage over converters that incorporate
opto-couplers in their design.
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 are electrical, mechanical and screening
can be accommodated.
Extensive computer simulation using complex modeling
enables rapid design modification to be provided.
Contact IR San Jose with specific requirements.
AHF
Features
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16V to 40VDC Input Range (28 VDC Nominal)
Single and Dual Outputs
12W Output Power
22.8W/in3 Power Density
Low Input / Output Noise
(50mA/60mVp-p max. respectively)
Indefinite Short Circuit and Overload Protection
Wideband Control Loop for Superior Transient
Characterstics
No derating for -55°C to +125°C Operation
Constant Switching Frequency (550KHz Nominal)
Standard Microcircuit Drawings Available
www.irf.com
1
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