Sharp LC-39LE650E Service Manual page 60

LC-39/50LE650
LC-39/50LE651
LC-39/50LE652
MAJOR ICs INFORMATION ( continued )
IC1301: LNBs supply and Control IC
Part number: LNBH23QTR (ST MICRO)
Sharp code: RH-IXD310WJZZY
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00154977.pdf
Intended for analog and digital satellite receivers/sat-TV, sat-PC cards, the LNBH23 is a monolithic voltage regulator and
interface IC, assembled in PowerSSO-24 ePAD and QFN32 (5 x 5 mm.) ePAD, specifically designed to provide the 13/18 V
power supply and the 22 kHz 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.
Features:
Complete interface between LNB and I²C bus.
Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93% @ 0.75A), with
integrated NMOS.
Selectable output current limit by external resistor.
Compliant with main satellite receiver systems specifications.
New accurate built-in 22 kHz tone generator suits widely accepted standards.
Fast oscillator start-up facilitates DiSEqC™ encoding.
Built-in 22 kHz tone detector supports bidirectional DiSEqC™ 2.0.
Very low-drop post regulator and high efficiency step-up PWM with integrated power NMOS allow low
power losses.
Two output pins suitable to by-pass the output R-L filter and avoid any tone distortion (R-L filter as per
DiSEqC™ 2.0 specs).
Overload and over-temperature internal protections with I²C diagnostic bits.
Output voltage and output current level diagnostic feedback by I²C bits.
LNB short circuit dynamic protection.
± 4 kV ESD tolerant on output power pins.
.
60