STEVAL-LNBH06 STMicroelectronics

S T E VA L - L N B H 0 6 Power supply evaluation board for LNB based on the LNBH26S Data brief 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 / interfacing satellite LNB modules in accordance with international standards. This simple solution offers a complete solution for dual tuner satellite receivers and provides good performance at low cost using a low external component count. The LNBH26S evaluation board includes an IC bus interface and the internal 22 kHz tone generator which is factory trimmed and can be Features controlled by the DSQIN pin (TTL compatible), Complete interface between LNB and IC which allows immediate DiSEqC data bus encoding. Thanks to a fully integrated step-up Built-in DC-DC converter for single 12 V DC-DC converter, it functions with a single input supply operation and high efficiency (typ. voltage supply source ranging from 8 V to 16 V. 93% 0.5 A) 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 allowing 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 DocID029797 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-LNBH06 1 Schematic diagram Figure 1: STEVAL-LNBH06 circuit schematic D2-A L2 - A LNBOUT-A C5 - A D3 -A V 21 V OUT-A 20 UP -A R4-A D1- A R3-A LNBH26S (optional) C2 - A C3 -A BPSW-A 18 - TR1 A R2-A 3 LX-A 19 DETIN-A R5-A C6 -A DSQOUT-A 23 R1 (RSEL) L1 - A 9 ISEL DiSEqC 16 Byp - DSQIN A 22 22KHz TTL C7 Vin Tone enable control 17 Vcc 24 or DSQIN-B 12 V DiSEqC C4 ADDR 6 Open drains Envelope TTL C1 to controller 1 DSQOUT-B L1 -B 8 SDA 2 DL1 I C Bus R6 7 SCL 2 +5 V FLT C6-B 5 LX- B R5-B DETIN-B 13 - TR1 B R2-B - D1 B BPSW-B 14 (optional) R3-B LNBOUT-B R4-B 11 V UP -B V 12 OUT-B P-GND A-GND 4 15 C3-B C2 -B L2 -B C5 - B D3 -B D-TVS-B D2- B GSPG2709160945SG 2/4 DocID029797 Rev 1