LNBP8_06 Datasheet, PDF (1/13 Pages) STMicroelectronics – LNB Supply and control voltage regulator

LNBP8
LNBP9
LNB Supply and control voltage regulator
Feature summary
■ Simplest integrated solution for the LNB
remote supply and control
■ 500mA Guaranteed output current
■ Dual input supply for reducing power
dissipation
SPAK-7L
■ 22KHZ Built-in tone oscillator (LNBP9 version)
(PowerFlex^TM)
■ Fast oscillator start-up for DiSEqC^TM encoding
) _{(LNBP9 version)}
t(s _{■ Auxiliary modulation input for more flexibility}
c _{(LNBP8 version)}
du _{■ Stand-by function}
ro _{■ Short circuit and overtemperature protection}
P _{■ Available in through-hole package}
lete _Description
so _{Intended for analog and digital satellite receivers,}
b _{the LNBP is a monolithic linear voltage regulator,}
O _{assembled in PowerFlexTM, specifically designed}
- _{to provide the powering voltages and the}
t(s) ^{interfacing signals to the LNB down-converter.}
c ^{The regulator output can be logic controlled to be}
u 13V or 18V (typ.) by mean of the V_SEL pin for the
d _{remote controlling of the LNB. In order to reduce}
ro the power dissipation of the device when the
P lowest output voltage is selected, the regulator
te ^{has 2 supply inputs (VCC1 and VCC2). They must}
be powered respectively at 15V (min.) and 22V
le _{(min.), and an internal switch will automatically}
so ^{select the appropriate supply voltage according to}
Ob^{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
DiSEqC^TM protocols. 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 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.
Order code
Part number
LNBP8
LNBP9
Package
SPAK-7L
LNBP8K7
LNBP9K7
Packaging
Tape & reel
LNBP8K7-R
LNBP9K7-R
September 2006
Rev. 3
1/13
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