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LNBH221_06 Datasheet

  • LNBH221_06

  • Dual LNB supply and control IC with Step-Up converter and I2...

  • 27頁(yè)

  • STMICROELECTRONICS   STMICROELECTRONICS

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LNBH221
Dual LNB supply and control IC with
Step-Up converter and I虜C interface
Feature summary
I
I
All the features are the same for both section
Complete and independent interface between
LNBS and relevant I
2
C
TM
BUS
BUILT-IN DC/DC controller for single 12V
supply operation and high efficiency (Typ. 93%
@ 500mA)
LNB output current guaranteed up to 500mA
Both compliant with eutelsat and directv 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. 7, 8)
Overload and over-temperature internal
protections
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
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
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.
POWER SO-36
I
I
I
I
I
I
I
I
I
I
I
Description
Intended for analog and digital DUAL Satellite
STB receivers/SatTV, sets/PC cards, the
LNBH221 is a voltage regulator and interface IC,
February 2006
Rev. 5
1/27
www.st.com
27

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