September 2016

DocID029704 Rev 1

1/4

For further information contact your local STMicroelectronics sales

office

www.st.com

STEVAL-LNBH02

Power supply evaluation board for LNB based on the LNBH25S

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% at 0.5 A)



Selectable output current limit by external

resistor



Compliant with main satellite receivers

output voltage specification (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

for 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 LNBH25S device. It is

used to power LNBs inside dish antennas to

receive satellite TV signals.

The LNBH25S is an integrated solution for

supplying / interfacing satellite LNB modules in

accordance with international standards. It is a

simple and complete solution for dual tuner

satellite receivers and provides high performance

at low cost with a low external component count.

The LNBH25S evaluation board includes an I²C

bus interface and an 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.