1/18

April 2004

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ALL THE FEATURES ARE THE SAME FOR

BOTH SECTION

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COMPLETE AND INDEPENDENT

INTERFACE BETWEEN LNBs AND

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BUILT-IN DC/DC CONTROLLER FOR

SINGLE 12V SUPPLY OPERATION AND

HIGH EFFICIENCY (Typ. 93% @ 500mA)

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LNB OUTPUT CURRENT GUARANTEED UP

TO 500mA

s

BOTH COMPLIANT WITH EUTELSAT AND

DIRECTV OUTPUT VOLTAGE

SPECIFICATION

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ACCURATE BUILT-IN 22KHz TONE

OSCILLATOR SUITS WIDELY ACCEPTED

STANDARDS

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FAST OSCILLATOR START-UP FACILITATES

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BUILT-IN 22KHz TONE DETECTOR

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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)

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OVERLOAD AND OVER-TEMPERATURE

INTERNAL PROTECTIONS

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DIAGNOSTIC BITs

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LNB SHORT CIRCUIT SOA PROTECTION

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+/- 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-

dard interfacing.

LNBH221

DUAL LNB SUPPLY AND CONTROL IC

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