Lnb Supply And Control Ic; Lnbh29 - Hitachi 55HK6T64U Service Manual

Recommended Operating Conditions

12. LNB SUPPLY AND CONTROL IC

LNBH29

General Description
LNBH29 IC is intended for analog and digital Satellite receivers/Sat-TV, Sat-PC
cards, the LNBH29 series is a monolithic voltage regulator and interface IC, assembled in QFN3x3-16L and
QFN4x4-16L, specifically designed to provide the 13/18V power supply and the 22KHz tone signaling to the
LNB down-converter in the antenna dish or to the multi-switch box. In this application field, it offers a
complete solution with extremely low component count, low power dissipation together with simple design and
I2C standard interfacing.
Key Features

COMPLETE INTERFACE BETWEEN LNB AND I2C BUS

BUILT-IN DC/DC CONVERTER FOR SINGLE 12V SUPPLY OPERATION AND HIGH

EFFICIENCY (TYP. 93% @ 0.5A)

SELECTABLE OUTPUT CURRENT LIMIT BY EXTERNAL RESISTOR

COMPLIANT WITH MAIN SATELLITE RECEIVERS OUTPUT VOLTAGE

SPECIFICATION

ACCURATE BUILT-IN 22 kHz TONE GENERATOR SUITS WIDELY ACCEPTED

STANDARDS

22 KHz TONE WAVEFORM INTEGRITY GUARANTED ALSO AT NO LOAD

CONDITION

LOW-DROP POST REGULATOR AND HIGH EFFICIENCY STEP-UP PWM WITH

INTEGRATED POWER N-MOS ALLOW LOW POWER LOSSES.

OVERLOAD AND OVER-TEMPERATURE INTERNAL PROTECTIONS WITH I2C

DIAGNOSTIC BITS

LNB SHORT CIRCUIT DYNAMIC PROTECTION

+/- 4KV E.S.D. TOLERANT ON OUTPUT POWER PINS
Applications

LNB Power Supply and Control for Satellite Set Top Boxes
a) Package Reference
53