Lnb Supply Ans Control Ic; Software Update - Sharp LC-40LS340E Service Manual

LC-32LE340/343
LC-40LS340
LC-40LE340/343
17.
ST LNBH23L
a) Key Features
-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93%
@0.5 A)
-drop post regulator and high efficiency step-up PWM with integrated power NMOS
allow low power losses
- 4 kV ESD tolerant on output power pins
Applications
Description
Intended for analog and digital satellite receivers, the LNBH23L is a monolithic voltage
regulator and interface IC, assembled in QFN32 5 x 5 specifically designed to provide the 13 /
18 V power supply and the 22 kHz tone signalling 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.
b) Block Diagram
45
18.
LNB supply and control IC
-in 22 kHz tone generator suits widely accepted standards
-temperature internal protections with I²C diagnostic bits
te receivers

Software Update

pecification
64