STEVAL-LNBH02

STEVAL-LNBH02 Power supply evaluation board for LNB based on the LNBH25S Data brief 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. 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 September 2016 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. DocID029704 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com Schematic diagram 1 STEVAL-LNBH02 Schematic diagram Figure 1: STEVAL-LNBH02 circuit schematic D2 VOUT VUP D1 C2A C2B LNBH25S C3 LNBOUT C5 D3 LX BPSW L1 Tone enable control Vin 12 V C4 I 2C Bus TTL DL1 SDA +5 V FLT SCL R2 R1 (RSEL) ADDR ISEL Byp C6 DiSEqC envelope DSQOUT { TTL or DSQIN Vcc C1 DiSEqC 22 KHz DETIN P-GND A-GND GSPG0909161100SG 2/4 DocID029704 Rev 1 STEVAL-LNBH02 2 Revision history Revision history Table 1: Document revision history Date Version 15-Sep-2016 1 Changes Initial release. DocID029704 Rev 1 3/4 STEVAL-LNBH02 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2016 STMicroelectronics – All rights reserved 4/4 DocID029704 Rev 1