LNBEH21 datasheet(1/22 Pages) STMICROELECTRONICS

部件名	LNBEH21

功能描述	LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE

PDF	22 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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July 2004

s

COMPLETE INTERFACE BETWEEN LNB

AND I2CTM BUS

s

BUILT-IN DC/DC CONTROLLER FOR

SINGLE 12V SUPPLY OPERATION AND

HIGH EFFICIENCY (Typ. 94% @ 750mA)

s

TWO SELECTABLE OUTPUT CURRENT

LIMIT (450mA / 750mA)

s

ACCURATE BUILT-IN 22KHz TONE

OSCILLATOR SUITS WIDELY ACCEPTED

STANDARDS

s

FAST OSCILLATOR START-UP FACILITATES

DiSEqCTM ENCODING

s

BUILT-IN 22KHz TONE DETECTOR

SUPPORTS BI-DIRECTIONAL DiSEqCTM 2.0

s

13/18V CONTROL WORD

COMMUNICATION

s

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)

s

CABLE LENGTH DIGITAL COMPENSATION

s

OVERLOAD AND OVER-TEMPERATURE

INTERNAL PROTECTIONS I2C WITH

DIAGNOSTIC BITs

s

LNB SHORT CIRCUIT SOA PROTECTION

WITH I2C DIAGNOSTIC BIT

s

+/- 4KV ESD TOLERANT ON INPUT/

OUTPUT POWER PINS

DESCRIPTION

Intended for analog and digital satellite STB

receivers/SatTV, sets/PC cards, the LNBEH21 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. The LNBEH21 supports both methods of

communication currently used, 13/18V Control

Word

Communication

Mode

and

DiSEqCTM

communication. 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.

LNBEH21

LNB SUPPLY AND CONTROL IC WITH

STEP-UP CONVERTER AND I2C INTERFACE

TEN/VSEL

Enable

Preregul.+

U.V.lockout

+P.ON res.

V Select

Linear Post-reg

+Modulator

+Protections

Vup

VoRX

SDA

SCL

Vcc

Diagnostics

I²C interf.

Tone

Detector

DSQOUT

VoTX

DETIN

LNBEH21

Byp

Gate

Sense

EXTM

ADDR

Vup-Feedback

Step-up PWM

Controller

ISEL

Oscill.

13/18V control

Tone control

OM=low

OM=High

Echo-pulses control

TRISE= TFALL = 500µs

22KHz

BLOCK DIAGRAM

PowerSO-20

Rev. 1

类似零件编号 - LNBEH21

制造商	部件名	数据表	功能描述
Make-Ps	LNB	173Kb / 4P	Single Output DC/DC Converter
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	LNB-1/2	219Kb / 1P	Polyamide 6 Cord Grips
	LNB-3/4	219Kb / 1P	Polyamide 6 Cord Grips
	LNB-3/8	219Kb / 1P	Polyamide 6 Cord Grips

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