elleny

Single LNB power and control IC based on LNBH25 DiSEqC 2.0 compliant

STEVAL-CBL010V1

Overview

This product evaluation board implements a DC-DC converter based on the LNBH25 device used to power LNBs inside dish antennas which receive satellite TV signals. The LNBH25 is an integrated solution for supplying/interfacing satellite LNB modules in accordance with international standards, offering a complete solution for single tuner satellite receivers and good performance at low cost using few external components. The LNBH25 evaluation board includes an I²C bus interface and the internal 22 kHz tone generator (factory trimmed) is controlled by the DSQIN pin (TTL compatible), permitting immediate DiSEqC™ data encoding. A fully integrated step-up DC-DC converter allows operation with a single input voltage supply source ranging from 8 V to 16 V.

Main features

Complete interface between LNB and I²C bus
Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93% at 0.5 A)
Selectable output current limit using an external resistor
Compliant with main satellite receiver output voltage specifications (15 programmable levels)
Accurate built-in 22 kHz tone generator suits widely accepted standards
22 kHz tone waveform integrity guaranteed also at no load

Low-drop post-regulator and high-efficiency step-up PWM with integrated power N-MOS allowing low power losses
LMP function (low-power mode) to reduce dissipation
Overload and overtemperature internal protection with I²C diagnostic bits
LNB short-circuit dynamic protection
RoHS compliant

Design Files

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Update:2025-05-08 20:46:37

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