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LNBH21

STMicroelectronics
Part Number LNBH21
Manufacturer STMicroelectronics
Description LNB SUPPLY/CONTROLLER
Published Mar 22, 2005
Detailed Description LNBH21 LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE s s s s s s s s s s s COMPLETE INTER...
Datasheet PDF File LNBH21 PDF File

LNBH21
LNBH21

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 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 s s s 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 I²C interf.
Enable Diagnostics ADDR TEN 22KHz Oscill.
Tone Detector DETIN DSQOUT DSQIN April 2004 1/20 LNBH21 ORDERING CODES TYPE LNBH21 PowerSO-20 (Tube) LNBH21PD PowerSO-20 (Tape & Reel) LNBH21PD-TR A...


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