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LNBH221

DUAL LNB SUPPLY AND CONTROL IC

WITH STEP-UP CONVERTER AND I

2

C INTERFACE

PRELIMINARY DATA

s

s

s

s

s

s

s

s

s

s

s

s

s

s

ALL THE FEATURES ARE THE SAME FOR

BOTH SECTION

COMPLETE AND INDEPENDENT

INTERFACE BETWEEN LNBs AND

RELEVANT I

2

C

TM

BUS

BUILT-IN DC/DC CONTROLLER FOR

SINGLE 12V SUPPLY OPERATION AND

HIGH EFFICIENCY (Typ. 93% @ 500mA)

LNB OUTPUT CURRENT GUARANTEED UP

TO 500mA

BOTH COMPLIANT WITH EUTELSAT AND

DIRECTV OUTPUT VOLTAGE

SPECIFICATION

ACCURATE BUILT-IN 22KHz TONE

OSCILLATOR SUITS WIDELY ACCEPTED

STANDARDS

FAST OSCILLATOR START-UP FACILITATES

DiSEqC

TM

ENCODING

BUILT-IN 22KHz TONE DETECTOR

SUPPORTS BI-DIRECTIONAL DiSEqC

TM

2.0

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. 4)

OVERLOAD AND OVER-TEMPERATURE

INTERNAL PROTECTIONS

OVERLOAD AND OVER-TEMPERATURE I

2

C

DIAGNOSTIC BITs

LNB SHORT CIRCUIT SOA PROTECTION

WITH I

2

C DIAGNOSTIC BIT

+/- 4KV ESD TOLERANT ON INPUT/

OUTPUT POWER PINS

PowerSO-36

tremely low component count, low power dissipa-

tion together with simple design and I

2

C

TM

stan-

dard interfacing.

BLOCK DIAGRAM

Gate

Sense

Step-up

Controller

LNBH221- section A

VoTX

Vup

Vcc

Byp

Preregul.+

U.V.lockout

+P.ON res.

VoRX

Linear Post-reg

+Modulator

+Protections

Diagn.

EXTM

SDA

SCL

ADDR

V Select

I虜C

Enable

TEN

DSQIN

22KHz

Oscill.

Tone

Detector

DETIN

DSQOUT

Gate

Sense

Step-up

Controller

LNBH221- section B

VoTX

Vup

Vcc

Preregul.+

U.V.lockout

+P.ON res.

VoRX

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-

April 2004

Byp

Linear Post-reg

+Modulator

+Protections

Diagn.

EXTM

SDA

SCL

ADDR

V Select

I虜C

Enable

TEN

DSQIN

22KHz

Oscill.

Tone

Detector

DETIN

DSQOUT

1/18

This is preliminary information on a new product now in development are or undergoing evaluation. Details subject to change without notice.

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