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LNBEH21

LNB SUPPLY AND CONTROL IC WITH

STEP-UP CONVERTER AND I

2

C INTERFACE

s

s

s

s

s

s

s

s

s

s

s

COMPLETE INTERFACE BETWEEN LNB

AND I

2

C

TM

BUS

BUILT-IN DC/DC CONTROLLER FOR

SINGLE 12V SUPPLY OPERATION AND

HIGH EFFICIENCY (Typ. 94% @ 750mA)

TWO SELECTABLE OUTPUT CURRENT

LIMIT (450mA / 750mA)

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

13/18V CONTROL WORD

COMMUNICATION

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)

CABLE LENGTH DIGITAL COMPENSATION

OVERLOAD AND OVER-TEMPERATURE

INTERNAL PROTECTIONS I

2

C WITH

DIAGNOSTIC BITs

PowerSO-20

s

s

LNB SHORT CIRCUIT SOA PROTECTION

WITH I

2

C DIAGNOSTIC BIT

+/- 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 DiSEqC

TM

communication. In this application field, it offers a

complete solution with extremely low component

count, low power dissipation together with simple

design and I

2

C

TM

standard interfacing.

BLOCK DIAGRAM

Gate

Sense

Step-up PWM

Controller

LNBEH21

Vup-Feedback

VoTX

Vup

VoRX

Vcc

Byp

Preregul.+

U.V.lockout

+P.ON res.

Linear Post-reg

+Modulator

+Protections

ISEL

EXTM

SDA

SCL

ADDR

V Select

I虜C interf. Enable

22KHz

Diagnostics

Oscill

.

OM=low

Tone

Detector

DETIN

DSQOUT

Tone control

Echo-pulses control

T

RISE

= T

FALL

= 500碌s

TEN/VSEL

13/18V control

OM=High

July 2004

Rev. 1

1/22

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LNBEH21相關(guān)型號(hào)PDF文件下載

• 型號(hào)
  版本
  描述
  廠商
  下載
• LNBEH21
  英文版
  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTE...
  
  LNBEH21
• LNBEH21
  英文版
  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND ...
  STMICROELECTRON...
  LNBEH21
• LNBEH21PD
  英文版
  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTE...
  
  LNBEH21PD
• LNBEH21PD
  英文版
  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND ...
  STMICROELECTRON...
  LNBEH21PD
• LNBEH21PD-...
  英文版
  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTE...
  
  LNBEH21PD-TR
• LNBEH21PD-...
  英文版
  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND ...
  STMICROELECTRON...
  LNBEH21PD-TR

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