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AHV2815SFCH Datasheet(PDF) 1 Page - International Rectifier |
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AHV2815SFCH Datasheet(HTML) 1 Page - International Rectifier |
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1 / 9 page  12/13/06 www.irf.com 1 HYBRID-HIGH RELIABILITY DC/DC CONVERTER AHV28XX SERIES Description n 80V Transient Input (100 msec max.) n 50V DC Input (Continous) n 16V to 40V DC Input Range n Single, Dual and Triple Outputs n 15W Output Power (No Temperature Derating) n Low Input / Output Noise n Full Military Temperature Range n Wideband PWM Control Loop n Magnetic Feedback n Low Profile Hermetic Package (0.405”) n Short Circuit and Overload Protection n Constant Switching Frequency (500KHz) n True Hermetic Package (Parallel Seam Welded, Ceramic Pin Feedthru) n Standard Microcircuit Drawings Available Features AHV 28V Input, Single, Dual and Triple Output The AHV Series of DC/DC converters are designed to replace the AHE/ATO family of converters in applications requiring compliance to MIL-STD-704A through E, in particular the input surge requirement of 80V specified to withstand transient input voltage of 80V. No input voltage or output power derating is necessary over the full military temperature range. These converters are packaged in an extremely rugged, low profile package that meets all requirements of MIL- STD-883 and MIL-PRF-38534. Parallel seam weld sealing and the use of ceramic pin feed thru seals assure long term hermeticity after exposure to extended temperature cycling. The basic circuit is a push-pull forward topology using power MOSFET switches. The nominal switching frequency is 500KHz. A unique current injection circuit assures current balancing in the power switches. All AHV series converters use a single stage LC input filter to attenuate input ripple current. A low power 11.5V series regulator provides power to an epitaxial CMOS custom pulse width modulator integrated circuit. This single integrated circuit provides all PWM primary circuit functions. Power is transferred from primary to secondary through a ferrite core power transformer. An error voltage signal is generated by comparing a highly stable reference voltage with the converter output voltage and drives the PWM through a unique wideband magnetic feedback circuit. This proprietary feedback circuit provides an extremely wide bandwidth, high gain control loop, with high phase margin. The feedback control loop gain is insensitive to temperature, radiation, aging, and variations in manufacturing. The transfer function of the feedback circuit is a function of the feedback transformer turns ratio which cannot change when subjected to environmental extremes. 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 in electrical, mechanical and screening can be accommodated. Contact IR Santa Clara for special requirements. PD-94583A |
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