September 2016

DocID029721 Rev 1

1/4

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STEVAL-LNBH05

Power supply evaluation board for LNB based on the LNBH26S

Data brief

Features



Complete interface between LNB and I²C

bus



Built-in DC-DC converter for single 12 V

supply operation and high efficiency (typ.

93% @ 0.5 A)



Selectable output current limit by external

resistor



Compliant with the output voltage

specifications of principal satellite receivers

(15 programmable levels)



Accurate built-in 22 kHz tone generator suits

widely accepted standards



22 kHz tone waveform integrity guaranteed

also at no load condition



Low drop post regulator and high efficiency

step-up PWM with integrated power N-MOS

allowing low power losses



LPM function (low power mode) to reduce

dissipation



Overload and overtemperature internal

protection with I²C diagnostic bits



LNB short-circuit dynamic protection



±4 kV ESD tolerant on output power pins



RoHS compliant

Description

This evaluation board implements a DC-DC

converter based on the LNBH26S device. It is

used to power LNBs inside dish antennas to

receive satellite TV signals.

The LNBH26S is an integrated solution for

supplying and interfacing satellite LNB modules

in accordance with international standards. This

simple and complete solution for dual tuner

satellite receivers offers high performance at low

cost and low external component count.

The LNBH26S evaluation board includes an I²C

bus interface and the internal 22 kHz tone

generator which is factory trimmed and can be

controlled by the DSQIN pin (TTL compatible),

allowing immediate DiSEqC™ data encoding.

Thanks to a fully integrated step-up DC-DC

converter, it functions with a single input voltage

supply source ranging from 8 V to 16 V.