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LNBH21| Datasheet

By datasheet - April 3rd, 2008

LNBH21, LNBH21PD-TR

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LNBH21
LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
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COMPLETE 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 COMPLIANT 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. 5) CABLE LENGTH DIGITAL COMPENSATION OVERLOAD AND OVER-TEMPERATURE INTERNAL PROTECTIONS

PowerSO-20
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OVERLOAD AND OVER-TEMPERATURE I2C DIAGNOSTIC BITs LNB SHORT CIRCUIT SOA PROTECTION WITH I2C DIAGNOSTIC BIT +/- 4KV ESD TOLERANT ON INPUT/ OUTPUT POWER PINS

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 complete solution with extremely low component 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. Linear Post-reg +Modulator +Protections

ISEL EXTM

SDA SCL

V Select I C interf. Enable

Diagnostics

ADDR
TEN 22KHz Oscill.

Tone Detector

DETIN DSQOUT

DSQIN

April 2004

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