LNBP14

LNBP20 / LNBP1X series LNBP supply and control voltage regulator (parallel interface) Feature summary ■ Complete interface for two LNBs remote supply and control ■ LNB selection and stand-by function ■ Built-in tone oscillator factory trimmed at 22KHz ■ Fast oscillator start-up facilitates DiSEqCTM encoding ■ Two supply inputs for lowest dissipation ■ Bypass function for slave operation ■ LNB short circuit protection and diagnostic ■ Auxiliary modulation input extends flexibility ■ Cable length compensation ■ Internal over temperature protection ■ Backward current protection Description Intended for analog and digital satellite receivers, the LNBP is a monolithic linear voltage regulator, assembled in PowerSO-20 and PowerSO-10, specifically designed to provide the powering voltages and the interfacing signals to the LNB downconverter situated in the antenna PowerSO-20 10 1 PowerSO-10 via the coaxial cable. Since most satellite receivers have two antenna ports, the output voltage of the regulator is available at one of two logic-selectable output pins (LNBA, LNBB). When the IC is powered and put in Stand-by (EN pin LOW), both regulator outputs are disabled to allow the antenna downconverters to be supplied/controlled by others satellite receivers sharing the same coaxial lines. In this occurrence the device will limit at 3 mA (max) the backward current that could flow from LNBA and LNBB output pins to GND. (See continuous description). Order codes Part number May 2007 ...