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參數資料
| 型號： | LNBH21PD-TR |
| 廠商： | 意法半導體 |
| 英文描述： | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| 中文描述： | LNB電源與控制集成電路升壓轉換器和I2C接口 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 493K |
| 代理商： | LNBH21PD-TR |
1/20
April 2004
I
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)
BOTH COMPLIANT WITH EUTELSAT AND
DIRECT 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. 5)
CABLE LENGTH DIGITAL COMPENSATION
OVERLOAD AND OVER-TEMPERATURE
INTERNAL PROTECTIONS
I
I
I
I
I
I
I
I
I
I
I
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
I
I
DESCRIPTION
Intended for analog and digital satellite STB
receivers/SatTV, sets/PC cards, the LNBH21 is a
monolithic voltage regulator and interface IC,
assembled
in
POWER
designed to provide the 13/18V power supply and
the
22KHz
tone
signalling
downconverter in the antenna or to the multiswitch
box. 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.
SO-20,
specifically
to
the
LNB
LNBH21
LNB SUPPLY AND CONTROL IC WITH
STEP-UP CONVERTER AND I
2
C INTERFACE
DSQIN
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
LNBH21
Byp
Gate
Sense
EXTM
ADDR
22KHz
Oscill.
TEN
Vup-Feedback
Step-up PWM
Controller
ISEL
BLOCK DIAGRAM
PowerSO-20
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