STMicroelectronics LNBH23L Manuals

LNBH23L is an LNB supply and control IC with step-up and I²C interface. It features a built-in DC-DC converter for single 12V supply operation and high efficiency (typical 93% @ 0.5A). The output current limit can be selected by an external resistor. It is compliant with main satellite receivers output voltage specification. The auxiliary modulation input facilitates DiSEqC™ 1.X encoding. It has an accurate built-in 22kHz tone generator that suits widely accepted standards. It also has a low-drop post regulator and high efficiency step-up PWM with integrated power NMOS to allow low power losses. It has overload and over-temperature internal protections with I²C diagnostic bits. It also has LNB short circuit dynamic protection. The output power pins are ±4kV ESD tolerant.

This document describes the features and characteristics of the STEVAL-CBL007V1 LNB power supply demonstration board based on the DiSEqC 1.X-compliant LNBH23L, including complete interface between LNB and I2C bus, built-in DC-DC converter for single 12 V supply operation, selectable output current limitation, compliance with main satellite receiver output voltage specifications, auxiliary modulation input, accurate built-in 22 kHz tone generator, low-drop post regulator, high efficiency step-up PWM, internal overload and over-temperature protection, and dynamic LNB short-circuit protection.

The LNBH23L is an integrated solution for supplying/interfacing satellite LNB modules. It gives good performance in a simple and cheap way, with minimum external components necessary. It includes all functions needed for LNB supplying and interfacing, in accordance with international standards. Moreover, it includes an I²C bus interface and, thanks to a fully integrated step-up DC-DC converter, it functions with a single input voltage supply ranging from 8 V to 15 V.