for further information contact your local stmicroelectronics sales office. february 2013 doc id 024060 rev 1 1/4 4 STEVAL-CBL009V1 diseqc 1.x-compliant single lnb supply and control ic based on the lnbh25 data brief features complete interface between lnb and i 2 c bus built-in dc-dc converter for single 12 v supply operation and high efficiency (typ. 93% @ 0.5 a) selectable output current limit by external resistor 22 khz tone waveform integrity guaranteed also in no load condition low-drop post regulator and high efficiency step-up pwm with integrated power n-mos for low power loss lpm (low power mode) function to reduce dissipation overload and overtemperature internal protection with i 2 c diagnostic bits lnb short-circuit dynamic protection diseqc 1.x communication rohs compliant description the STEVAL-CBL009V1 demonstration board implements a dc-dc converter based on st?s lnbh25 device. it is used to power lnbs in dish antennas to receive satellite tv signals. it provides good performance at low cost using a low external component count, and includes all functions needed for supplying/interfacing lnb modules in accordance with international standards. the device includes an i 2 c bus interface and, thanks to a fully integrated step-up dc-dc converter, it works with a single input voltage supply ranging from 8 v to 16 v. www.st.com
schematic diagram STEVAL-CBL009V1 2/4 doc id 024060 rev 1 1 schematic diagram figure 1. STEVAL-CBL009V1 circuit schematic / 9 9 l q w r / 1 % / ; 9 x s 9 r x w $ ' ' 5 & |