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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