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LNBEH21 PDF预览

LNBEH21

更新时间: 2024-11-26 21:54:23
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 转换器升压转换器
页数 文件大小 规格书
22页 592K
描述
LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE

LNBEH21 数据手册

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LNBEH21  
LNB SUPPLY AND CONTROL IC WITH  
2
STEP-UP CONVERTER AND I C INTERFACE  
COMPLETE INTERFACE BETWEEN LNB  
AND I C BUS  
2
TM  
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  
PowerSO-20  
LNB SHORT CIRCUIT SOA PROTECTION  
WITH I C DIAGNOSTIC BIT  
+/- 4KV ESD TOLERANT ON INPUT/  
OUTPUT POWER PINS  
2
FAST OSCILLATOR START-UP FACILITATES  
DiSEqC ENCODING  
TM  
BUILT-IN 22KHz TONE DETECTOR  
SUPPORTS BI-DIRECTIONAL DiSEqC 2.0  
TM  
DESCRIPTION  
13/18V CONTROL WORD  
COMMUNICATION  
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  
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)  
TM  
Word Communication Mode and DiSEqC  
CABLE LENGTH DIGITAL COMPENSATION  
communication. In this application field, it offers a  
complete solution with extremely low component  
count, low power dissipation together with simple  
OVERLOAD AND OVER-TEMPERATURE  
2
INTERNAL PROTECTIONS I C WITH  
2
TM  
design and I C standard interfacing.  
DIAGNOSTIC BITs  
BLOCK DIAGRAM  
LNBEH21  
Gate  
Step-up PWM  
Controller  
Vup-Feedback  
Sense  
VoTX  
VoRX  
Vup  
Vcc  
Preregul.+  
U.V.lockout  
+P.ON res.  
Byp  
Linear Post-reg  
+Modulator  
ISEL  
+Protections  
EXTM  
V Select  
Enable  
SDA  
SCL  
Diagnostics  
I²C interf.  
22KHz  
Oscill.  
Tone  
Detector  
ADDR  
DETIN  
OM=low  
Tone control  
DSQOUT  
TEN/VSEL  
13/18V control  
OM=High  
Echo-pulses control  
RISE  
T
= TFALL= 500µs  
Rev. 1  
July 2004  
1/22  

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