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LNBH21 Datasheet Lnb Supply/controller

Manufacturer: STMicroelectronics

Overview: LNBH21 LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE s s s s s s s s s s s PLETE INTERFACE BETWEEN LNB AND I2CTM BUS BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION AND HIGH EFFICIENCY (Typ. 94% @ 750mA) TWO SELECTABLE OUTPUT CURRENT LIMIT (450mA / 750mA) BOTH PLIANT WITH EUTELSAT AND DIRECT OUTPUT VOLTAGE SPECIFICATION ACCURATE BUILT-IN 22KHz TONE OSCILLATOR SUITS WIDELY ACCEPTED STANDARDS FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM2.0 SEMI-LOWDROP POST REGULATOR AND HIGH EFFICIENCY STEP-UP PWM FOR LOW POWER LOSS: Typ. 0.56W @ 125mA 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.

General Description

Intended for analog and digital satellite STB receivers/SatTV, sets/PC cards, the LNBH21 is a monolithic voltage regulator and interface IC, assembled in POWER SO-20, specifically designed to provide the 13/18V power supply and the 22KHz tone signalling to the LNB downconverter in the antenna or to the multiswitch box.

In this application field, it offers a plete solution with extremely low ponent count, low power dissipation together with simple design and I2CTM standard interfacing.

BLOCK DIAGRAM Gate LNBH21 Step-up PWM Controller Vup-Feedback Sense VoTX Vup VoRX Vcc Byp Preregul.+ U.V.lockout +P.ON res.

Key Features

  • ailable (EXTM). An appropriate DC blocking capacitor must be used to couple the modulating signal source to the EXTM pin. Also in this case, the VOTX output must be.

More Datasheets from STMicroelectronics

Part Number Description
LNBH2 LNB SUPPLY AND CONTROLLER
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LNBH24 DUAL LNB SUPPLY/CONTROLLER
LNBH24L Dual LNBS supply/controller
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LNBH21 Distributor