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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LNBK20D2 Fiches technique(PDF) 1 Page - STMicroelectronics |
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LNBK20D2 Fiches technique(HTML) 1 Page - STMicroelectronics |
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1 / 14 page  1/14 July 2003 s COMPLETE INTERFACE FOR TWO LNBs REMOTE SUPPLY AND CONTROL s GUARANTEED 400mA OUTPUT CURRENT s LNB SELECTION AND STAND-BY FUNCTION s BUILT-IN TONE OSCILLATOR FACTORY TRIMMED AT 22KHz s FAST OSCILLATOR START-UP FACILITATES DiSEqC ™ ENCODING s TWO SUPPLY INPUTS FOR LOWEST DISSIPATION s BYPASS FUNCTION FOR SLAVE OPERATION s LNB SHORT CIRCUIT PROTECTION AND DIAGNOSTIC s AUXILIARY MODULATION INPUT EXTENDS FLEXIBILITY s CABLE LENGTH COMPENSATION s INTERNAL OVER TEMPERATURE PROTECTION s BACKWARD CURRENT PROTECTION s COST-EFFECTIVE VERSION OF LNBP SERIES DESCRIPTION Intended for analog and digital satellite receivers, the LNBK20D2 is a monolithic linear voltage regulator, assembled in SO-20, specifically designed to provide the powering voltages and the interfacing signals to the LNB downconverter situated in the antenna via the coaxial cable. It has the same functionality of the LNBP1X and LNBP20 series, at a reduced output current capability. 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. For slave operation in single dish, dual receiver systems, the bypass function is implemented by an electronic switch between the Master Input pin (MI) and the LNBA pin, thus leaving all LNB powering and control functions to the Master Receiver. This electronic switch is closed when the device is powered and EN pin is LOW. The regulator outputs can be logic controlled to be 13 or 18 V (typ.) by mean of the VSEL pin for remote controlling of LNBs. Additionally, it is possible to increment by 1V (typ.) the selected voltage value to compensate the excess voltage drop along the coaxial cable (LLC pin HIGH). In order to reduce the power dissipation of the device when the lowest output voltage is selected, the regulator has two Supply Input pins VCC1 and VCC2. They must be powered respectively at 16V (min) and 23V (min), and an internal switch automatically will select the suitable supply pin according to the selected output voltage. If adequate heatsink is provided and higher power losses are acceptable, both supply pins can be powered by the same 23V source without affecting any other circuit performance. The ENT (Tone Enable) pin activates the internal oscillator so that the DC output is modulated by a ±0.3 V, 22KHz (typ.) square wave. This internal oscillator is factory trimmed within a tolerance of ±2KHz, thus no further adjustments neither external components are required. A burst coding of the 22KHz tone can be accomplished thanks to the fast response of the ENT input and the prompt oscillator start-up. This helps designers who want to implement the DiSEqC ™ protocols (*). In order to improve design flexibility and to allow implementation of newcoming LNB remote control standards, an analogic modulation input pin is LNBK20D2 LNB SUPPLY AND CONTROL VOLTAGE REGULATOR (PARALLEL INTERFACE) SO-20 |
Numéro de pièce similaire - LNBK20D2 |
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Description similaire - LNBK20D2 |
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