AHV2805S Datasheet (data sheet) PDF

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HYBRID-HIGH RELIABILITY DC-DC CONVERTER PD-94583C AHV28XX SERIES 28V Input, Si ngle, Dual and Triple Output Descripti on The AHV Series of DC-DC converters a re designed to replace the AHE/ATO fami ly of converters in applications requir ing compliance to MIL-STD-704A through E, in particular the input surge requir ement of 80V specified to withstand tra nsient input voltage of 80V. No input v oltage or output power derating is nece ssary over the full military temperatur e range. These converters are packaged in an extremely rugged, low profile pac kage that meets all requirements of MIL STD-883 and MIL-PRF-38534. Parallel sea m weld sealing and the us

e of ceramic pin feed thru seals assure long term hermeticity after exposure to extended temperature cycling. The basi c circuit is a push-pull forward topolo gy using power MOSFET switches. The nom inal switching frequency is 500kHz. A u nique current injection circuit assures current balancing in the power switche s. All AHV series converters use a sing le stage LC input filter to attenuate i nput ripple current. A low power 11.5V series regulator provides power to an e pitaxial CMOS custom pulse width modula tor integrated circuit. This single int egrated circuit provides all PWM primar y circuit functions. Power is transferr ed from primary to secondary through a ferrite core power transformer. An erro r voltage signal is generated by compar ing a highly stable reference voltage w ith the converter output voltage and dr ives the PWM through a unique wideband magnetic feedback circuit. This proprie tary feedback circuit provides an extre mely wide bandwidth, high gain control loop, with high phase margin. The feedb ack control loop gain is insensitive to temperature, radiation, aging, and var iations in manufacturing. The transfer function of the feedback circuit is a f unction of the feedback transformer tur ns ratio which cannot change when subje cted to environmental extremes. Manufactured in a f