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AN3115 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN3115 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 28 page ![]() January 2011 Doc ID 16830 Rev 3 1/28 AN3115 Application note LNB power supply based on the LNBH23L supply and control IC with step-up and I²C interface Introduction This application note is intended to provide additional information and suggestions for the correct use of the LNBH23L device. All waveforms shown are based on the demonstration board order code STEVAL-CBL007V1 described in Section 3. The LNBH23L is an integrated solution for supplying/interfacing satellite LNB modules. It gives good performance in a simple and cheap way, with minimum external components necessary. It includes all functions needed for LNB supplying and interfacing, in accordance with international standards. Moreover, it includes an I²C bus interface and, thanks to a fully integrated step-up DC-DC converter, it functions with a single input voltage supply ranging from 8 V to 15 V. Figure 1. LNBH23L internal block diagram SDA SCL LNBH23L ADDR I²C OLF and OTF Diagnostics I² C interface DSQIN Vup VoRX VoTX LX 22KHz Oscill. Rsense EN VSEL Linear Post-reg +Protections +Diagnostics TTX EN VSEL VOUT Control EXTM P-GND Preregulator +U.V.lockout +P.ON reset Byp Vcc Vcc-L ISEL TTX TEN TTX I²C OLF and OTF I² C interface Vup 22KHz Oscill. 22KHz Oscill. EN VSEL -reg +Protections +Diagnostics EN VSEL VOUT Control A-GND A-GND - Preregulator +U.V.lockout +P.ON reset -- FB PDC Pull Down Controller SDA SCL LNBH23L ADDR I²C OLF and OTF Diagnostics I² C interface DSQIN Vup VoRX VoTX LX 22KHz Oscill. Rsense EN VSEL Linear Post-reg +Protections +Diagnostics TTX EN VSEL VOUT Control EXTM P-GND Preregulator +U.V.lockout +P.ON reset Byp Vcc Vcc-L ISEL TTX TEN TTX I²C OLF and OTF I² C interface Vup 22KHz Oscill. 22KHz Oscill. EN VSEL -reg +Protections +Diagnostics EN VSEL VOUT Control A-GND A-GND A-GND A-GND - Preregulator +U.V.lockout +P.ON reset -- FB PDC Pull Down Controller www.st.com |
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