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LNBH221 数据表(PDF) 1 Page - STMicroelectronics |
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LNBH221 数据表(HTML) 1 Page - STMicroelectronics |
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1 / 18 page  1/18 April 2004 s ALL THE FEATURES ARE THE SAME FOR BOTH SECTION s COMPLETE AND INDEPENDENT INTERFACE BETWEEN LNBs AND RELEVANT I2CTM BUS s BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION AND HIGH EFFICIENCY (Typ. 93% @ 500mA) s LNB OUTPUT CURRENT GUARANTEED UP TO 500mA s BOTH COMPLIANT WITH EUTELSAT AND DIRECTV OUTPUT VOLTAGE SPECIFICATION s ACCURATE BUILT-IN 22KHz TONE OSCILLATOR SUITS WIDELY ACCEPTED STANDARDS s FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING s BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM 2.0 s SEMI-LOWDROP POST REGULATOR AND HIGH EFFICIENCY STEP-UP PWM FOR LOW POWER LOSS: Typ. 0.56W @ 125mA s TWO OUTPUT PINS SUITABLE TO BYPASS THE OUTPUT R-L FILTER AND AVOID ANY TONE DISTORSION (R-L FILTER AS PER DiSEqC 2.0 SPECs, see application circuit on pag. 4) s OVERLOAD AND OVER-TEMPERATURE INTERNAL PROTECTIONS s OVERLOAD AND OVER-TEMPERATURE I2C DIAGNOSTIC BITs s LNB SHORT CIRCUIT SOA PROTECTION WITH I2C DIAGNOSTIC BIT s +/- 4KV ESD TOLERANT ON INPUT/ OUTPUT POWER PINS DESCRIPTION Intended for analog and digital DUAL Satellite STB receivers/SatTV, sets/PC cards, the LNBH221 is a voltage regulator and interface IC, assembled in POWER SO-36, specifically designed to provide the power 13/18V, and the 22KHz tone signalling for two independent LNB down converters or to a multiswitch box that could be independently powered and set. In this applica- tion field, it offers a complete solution with ex- tremely low component count, low power dissipa- tion together with simple design and I2CTM stan- dard interfacing. LNBH221 DUAL LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE This is preliminary information on a new product now in development are or undergoing evaluation. Details subject to change without notice. PowerSO-36 PRELIMINARY DATA BLOCK DIAGRAM LNBH221- section A LNBH221- section B DSQIN Vup VoRX SDA SCL Vcc DSQOUT VoTX DETIN Byp Gate Sense EXTM ADDR Enable Preregul.+ U.V.lockout +P.ON res. V Select Linear Post-reg +Modulator +Protections Diagn. I²C Tone Detector 22KHz Oscill. TEN Step-up Controller DSQIN Vup VoRX SDA SCL Vcc DSQOUT VoTX DETIN Byp Gate Sense EXTM ADDR Enable Preregul.+ U.V.lockout +P.ON res. VSelect Linear Post-reg +Modulator +Protections Diagn. I²C Tone Detector 22KHz Oscill. TEN Step-up Controller LNBH221- section A LNBH221- section B DSQIN Vup VoRX SDA SCL Vcc DSQOUT VoTX DETIN Byp Gate Sense EXTM ADDR Enable Preregul.+ U.V.lockout +P.ON res. V Select Linear Post-reg +Modulator +Protections Diagn. I²C Tone Detector 22KHz Oscill. TEN Step-up Controller Enable Preregul.+ U.V.lockout +P.ON res. V Select Linear Post-reg +Modulator +Protections Diagn. I²C Tone Detector 22KHz Oscill. TEN Step-up Controller DSQIN Vup VoRX SDA SCL Vcc DSQOUT VoTX DETIN Byp Gate Sense EXTM ADDR Enable Preregul.+ U.V.lockout +P.ON res. VSelect Linear Post-reg +Modulator +Protections Diagn. I²C Tone Detector 22KHz Oscill. TEN Step-up Controller Enable Preregul.+ U.V.lockout +P.ON res. VSelect Linear Post-reg +Modulator +Protections Diagn. I²C Tone Detector 22KHz Oscill. TEN Step-up Controller |
类似零件编号 - LNBH221 |
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类似说明 - LNBH221 |
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