8282 Datasheet (Allegro) - (8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS

8282, (8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS

Buck regulator.

A current-mode buck converter provides the linear regulator a supply voltage that tracks the selected LNB output voltage.

The buck converter operates at 16 times the internal tone frequency, nominally 352-kHz.

The tracking regulator provides minimum power dissipation across the range

8281 AND 8282 A8282SLB NC OLF VBULK NC NC GND GND SENSE LNB LX VIN TCAP 1 2 3 24 23 22 EXTM VINT PUMPX VPUMP CPUMP GND GND ENT EN VSEL0 VSEL1 LLC LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS Intended for analog and digital satellite receivers, these low-noise block converter regulators (LNBRs) are monolithic linear and switching voltage regulators specifically designed to provide the power and interface signals to the LNB down converter via the coaxial cable.

If the device is in standby mode (EN t

8282 Features

* s LNB selection and standby function s Built-in tone oscillator factory trimmed to 22-kHz, facilitates DiSEqC™ (a trademark of EUTELSAT) encoding s Tracking switch-mode power converter for lowest dissipation s Externally adjustable short-circuit protection s LNB short-circuit protection and diagnost