HTH27022S Datasheet | International Rectifier

PD-97815 HIGH RELIABILITY DC-DC CONVERTER 165°C, 270V Input, 55W, 22V Single Output Description The HTH27022S is a single output 55W DC-DC converter designed to operate in extremely high temperature environments such as those encountered in oil exploration. Features include small size, low weight and high tolerance to environmental stresses such as wide wide temperature extremes, severe shock and vibration. All internal ponents and assembly processes have been selected and developed to ensure reliable performance in the intended operating environments. The converter incorporates a fixed frequency forward topology with magnetic feedback and internal EMI filter. It also includes an external inhibit port and have an adjustable output voltage. It is enclosed in a hermetic 4.0" x 2.15" x 0.40" (3.5"x1.5"x0.40"H excluding mounting tabs and I/O pins) Al Si package and weighs less than 70 grams. The package utilizes rugged ceramic feed-thru, copper-cored pins and is sealed using laser welding. Full environmental screening includes temperature cycling, constant acceleration, fine and gross leak, and burn-in. Please refer to Device Screening table. Variations in electrical specifications and screening to meet custom requirements can be acmodated Features n 190 to 400V DC Input Range n Up to 55W Output Power n 22V, 2.5A Rated Output Voltage and Current n Internal EMI Filter n Magnetically Coupled Current Feedback n 80% Minimum Efficiency n -20°C to +165°C continuous with transient up to +175°C n 100MΩ @ 500V DC Isolation n Under-Voltage Lockout n Short Circuit and Overload Protection n Output Over Voltage Limiter n Adjustable Output Voltage within 10% of nominal n External Inhibit n Low Weight < 70 grams Circuit Description The HTH27022S converter utilizes an enhanced forward topology with two power switches and resonant reset. The nominal switching frequency is 520 k Hz. Electrical isolation and tight output regulation are achieved through the use of...