STEVAL-LNBH01 STMicroelectronics

S T E VA L - L N B H 0 1 Power supply evaluation board for LNB based on the LNBH25LS Data brief Description This evaluation board implements a DC-DC converter based on the LNBH25LS device. It is used to power LNBs inside dish antennas to receive satellite TV signals. The LNBH25LS is an integrated solution for supplying / interfacing satellite LNB modules in accordance with international standards. This simple solution offers a complete solution for dual tuner satellite receivers and offers high performance at low cost with a low external component count. The LNBH25LS evaluation board includes an IC bus interface and the internal 22 kHz tone Features generator which is factory trimmed and can be controlled by the DSQIN pin (TTL compatible), Complete interface between LNB and IC allowing immediate DiSEqC data encoding. bus Built-in DC-DC converter for single 12 V Thanks to a fully integrated step-up DC-DC supply operation and high efficiency (typ. converter, it functions with a single input voltage 93% at 0.5 A) supply source ranging from 8 V to 16 V. Selectable output current limit by external resistor Compliant with output voltage specifications for principal satellite receivers (15 programmable levels) Accurate built-in 22 kHz tone generator suits widely accepted standards 22 kHz tone waveform integrity guaranteed even 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 IC diagnostic bits LNB short-circuit dynamic protection 4 kV ESD tolerant on output power pins RoHS compliant September 2016 DocID029697 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-LNBH01 1 Schematic diagram Figure 1: STEVAL-LNBH01 circuit schematic 2/4 DocID029697 Rev 1