September 2006

Rev. 3

1/13

13

LNBP8

LNBP9

LNB Supply and control voltage regulator

Feature summary

remote supply and control

dissipation

(LNBP9 version)

(LNBP8 version)

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

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 PowerFlex for an easy

through-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.

SPAK-7L

www.st.com

Order code

Part number

Package

Packaging

SPAK-7L

Tape & reel

LNBP8

LNBP8K7

LNBP8K7-R

LNBP9

LNBP9K7

LNBP9K7-R

Obsolete

Product(s)

- Obsolete

Product(s)