LNBP13SP datasheet(1/18 Pages) STMICROELECTRONICS

部件名	LNBP13SP

功能描述	LNB SUPPLY AND CONTROL VOLTAGE REGULATOR (PARALLEL INTERFACE)

PDF	18 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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LNBP10 SERIES

LNBP20

LNB SUPPLY AND CONTROL VOLTAGE

REGULATOR (PARALLEL INTERFACE)

September 1998

s

COMPLETE INTERFACE FOR TWO LNBs

REMOTE SUPPLY AND CONTROL

s

LNB SELECTION AND STAND-BY FUNCTION

s

BUILT-IN TONE OSCILLATOR FACTORY

TRIMMED AT 22KHz

s

FAST OSCILLATOR START-UP

FACILITATES DiSEqC

™ ENCODING

s

TWO SUPPLY INPUTS FOR LOWEST

DISSIPATION

s

BYPASS FUNCTION FOR SLAVE

OPERATION

s

LNB SHORT CIRCUIT PROTECTION AND

DIAGNOSTIC

s

AUXILIARY MODULATION INPUT EXTENDS

FLEXIBILITY

s

CABLE LENGTH COMPENSATION

s

INTERNAL OVER TEMPERATURE

PROTECTION

s

BACKWARD CURRENT PROTECTION

DESCRIPTION

Intended for analog and digital satellite receivers,

the LNBP is a monolithic linear voltage regulator,

assembled in Multiwatt-15, PowerSO-20 and

PowerSO-10, specifically designed to provide the

powering voltages and the interfacing signals to

the LNB downconverter situated in the antenna

via the coaxial cable. Since most satellite

receivers have two antenna ports, the output

voltage of the regulator is available at one of two

logic-selectable output pins (LNBA, LNBB). When

the IC is powered and put in Stand-by (EN pin

LOW), both regulator outputs are disabled to

allow

the

antenna

downconverters

to

be

supplied/controlled by others satellite receivers

sharing the same coaxial lines. In this occurrence

the device will limit at 3 mA (max) the backward

current that could flow from LNBA and LNBB

output pins to GND.

For slave operation in single dish, dual receiver

systems, the bypass function is implemented by

an electronic switch between the Master Input pin

(MI) and the LNBA pin, thus leaving all LNB

powering and control functions to the Master

Receiver. This electronic switch is closed when

the device is powered and EN pin is LOW.

The regulator outputs can be logic controlled to

be 13 or 18 V (typ.) by mean of the VSEL pin for

remote controlling of LNBs. Additionally, it is

possible to increment by 1V (typ.) the selected

voltage value to compensate the excess voltage

drop along the coaxial cable (LLC pin HIGH).

In order to reduce the power dissipation of the

device when the

lowest output

voltage is

selected, the regulator has two Supply Input pins

VCC1

and

VCC2.

They

must

be

powered

respectively at 16V (min) and 23V (min), and an

internal switch

automatically will

select the

suitable supply pin according to the selected

output voltage. If adequate heatsink is provided

and higher power losses are acceptable, both

supply pins can be powered by the same 23V

source

without

affecting

any

other

circuit

performance.

The ENT (Tone Enable) pin activates the internal

oscillator so that the DC output is modulated by a

±0.3 V, 22KHz (typ.) square wave. This internal

oscillator is factory trimmed within a tolerance of

±2KHz, thus no further adjustments neither

external components are required.

A burst coding of the 22KHz tone can be

Multiwatt-15

1

10

PowerSo-20

PowerSO-10

®

1/18

类似零件编号 - LNBP13SP

制造商	部件名	数据表	功能描述
STMicroelectronics	LNBP13SP-TR	486Kb / 24P	LNBP supply and control voltage regulator (parallel interface) 03-May-2007

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