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November 2004

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SIMPLEST INTEGRATED SOLUTION FOR

THE LNB REMOTE SUPPLY AND CONTROL

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500mA GUARANTEED OUTPUT CURRENT

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DUAL INPUT SUPPLY FOR REDUCING

POWER DISSIPATION

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22KHZ BUILT-IN TONE OSCILLATOR

(LNBP9 VERSION)

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FAST OSCILLATOR START-UP FOR

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AUXILIARY MODULATION INPUT FOR

MORE FLEXIBILITY (LNBP8 VERSION)

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STAND-BY FUNCTION

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SHORT CIRCUIT AND

OVERTEMPERATURE PROTECTION

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AVAILABLE IN THRU-HOLE PACKAGE

DESCRIPTION

Intended for analog and digital satellite receivers,

the LNBP is a monolithic linear voltage regulator,

to

provide

the

powering

voltages

and

the

interfacing signals to the LNB down-converter.

The regulator output can be logic controlled to be

remote controlling of the LNB. In order to reduce

the power dissipation of the device when the

lowest output voltage is selected, the regulator

be powered respectively at 15V (min.) and 22V

(min.), and an internal switch will automatically

select the appropriate supply voltage according to

the selected output voltage.

The TONE pin (only for the LNBP9 version)

activates the internal oscillator so that the DC

output is modulated by a 22KHz square wave.

This internal oscillator is factory trimmed within a

tolerance of +/- 2KHz, thus no further adjustment

or external components are required.

A burst coding of the 22KHz tone can be

accomplished thanks to the fast response of the

TONE input and the prompt oscillator start-up.

This helps designers which want to implement the

In order to improve design flexibility and to allow

implementation of other LNB remote control

standards, an analogic modulation input pin

(EXTM) is available (LNBP8 version only). An

appropriate DC blocking capacitor must be used

to couple the modulating signal source to the

EXTM pin.

Both versions integrate thermal and short circuit

protection.

The device is packaged in Heptawatt for an easy

thru-hole mounting. If an 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.

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

pin LOW), the regulator output is disabled and the

IC power consumption is reduced to 300µA typ.

Table 1: Order Codes

TYPE

HEPTAWATT

LNBP8

LNBP8V7V

LNBP9

LNBP9V7V

LNBP8

LNBP9

LNB SUPPLY AND CONTROL VOLTAGE REGULATOR

Heptawatt

Rev. 1