LNB Supply and Control Voltage Regulator

Intended for analog and digital satellite receivers, the LNB (low noise block) converter regulator is a monolithic linear and switching voltage regulator, specifically designed to provide power and interface signals to an LNB downconverter, via coaxial cable.

The device uses a 2-wire bidirectional serial interface, compatible with the I2C (Inter-C bus) standard, that operates up to 400 kHz.

The A8285 is supplied in a 16-lead plastic power SOIC with internally fused leads for thermal dissipation. The A8287 is supplied in a 24-lead plastic power SOIC with internally fused leads. Both devices are also available in lead (Pb) free versions, with 100 matte tine leadframe plating.

FEATURES

■ LNB selection and standby function

■ Provides up to 500 mA load current

■ Two-wire serial I2C interface

■ Built-in tone oscillator, factory-trimmed to 22 kHz; facilitates DiSEqC™ 2.0 encoding

■ Auxiliary modulation input

■ 22 kHz tone detector facilitates DiSEqC™ decoding (A8287 only)

■ Tracking switch-mode power converter for lowest dissipation

■ LNB overcurrent protection and diagnostics

■ Internal overtemperature protection

■ LNB voltages (16 possible levels) compatible with all common standards

A8285SLB属于集成电路（IC） > 特殊用途稳压器。Allegro MicroSystems制造生产的A8285SLB特殊用途稳压器该系列产品用于电源控制、某种形式的转换，适用于特定的复杂应用。因此，各种产品特性集差异较大，包括空燃比传感器接口、汽车交流发电机电压调节、DDR 端接、液体透镜控制、摩托车转向信号控制、热电 (peltier) 冷却器控制、压电触觉控制、阀门控制、小型发动机管理等。