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AHV28 Datasheet(PDF) 1 Page - International Rectifier |
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AHV28 Datasheet(HTML) 1 Page - International Rectifier |
1 / 9 page 11/20/02 www.irf.com 1 ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS AHV28XX SERIES Description n 80 Transient Input (100 msec max.) n 50 VDC Input (Continous) n 16 to 40 VDC Input Range n Single, Dual and Triple Outputs n 15 Watts 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) 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 applica- tions requiring compliance to MIL-STD-704A through E, in particular the input surge requirement of 80 volts specified to withstand transient input voltage of 80 volts. No input voltage or output power derating is necessary over the full military temperature range. These converters are packaged in an extremely rug- ged, 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 feedthru seals as- sure 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 fre- quency 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 11.5volt series regulator provides power to an epitaxial CMOS custom pulse width modulator integrated circuit. This single integrated circuit provides all PWM primary cir- cuit functions. Power is transferred from primary to sec- ondary through a ferrite core power transformer. An error voltage signal is generated by comparing a highly stable reference voltage with the converter output volt- age 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, radia- tion, aging, and variations in manufacturing. The trans- fer function of the feedback circuit is a function of the feedback transformer turns ratio which cannot change when subjected to environmental extremes. The CH grade is fully compliant to the require- ments of MIL-PRF-38534 for class H. The HB grade is processed and screened to the class H requirement, but may not necessarily meet all of the other MIL-PRF-38534 requirements, e.g., el- ement evaluation and Periodic Inspection (P.I.) not required. Both grades are tested to meet the complete group “A” test specification over the full military temperature range without output power deration. Two grades with more limited screen- ing are also available for use in less demanding applications. Variations in electrical, mechanical and screening can be accommodated. Contact Advanced Analog for special requirements. Manufactured in a facility fully qualified to MIL-PRF- 38534, these converters are available in four screen- ing grades to satisfy a wide range of requirements. PD - 94583 |
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