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AHF2805DFES Datasheet(PDF) 1 Page - International Rectifier |
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AHF2805DFES Datasheet(HTML) 1 Page - International Rectifier |
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1 / 19 page  03/09/10 www.irf.com 1 HYBRID-HIGH RELIABILITY DC-DC CONVERTER AHF28XX SERIES Description Features AHF 28V Input, Single and Dual Output 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. 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. Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact IR San Jose with specific requirements. n 16V to 40VDC Input Range (28 VDC Nominal) n Single and Dual Outputs n 12W Output Power n 22.8W/in3 Power Density n Low Input / Output Noise (50mA/60mVp-p max. respectively) n Indefinite Short Circuit and Overload Protection n Wideband Control Loop for Superior Transient Characterstics n No derating for -55°C to +125°C Operation n Constant Switching Frequency (550KHz Nominal) n Standard Microcircuit Drawings Available 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. PD-94541D |
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