STEVAL-CBL005V1 STMicroelectronics

STEVAL-CBL005V1 LNB power supply demonstration board based on the LNBH23 Data brief Features Integrated DC-DC converter Single input supply voltage: from 8 V to 15 V 2 I C bus interface for the IC control and diagnostics Integrated 22 kHz tone generator, factory- trimmed in accordance with widely accepted standards User-friendly graphical user interface LNBxxx control suit) software included in the kit Implements the LNBH23 in a QFN32 package Description STEVAL-CBL005V1 The STEVAL-CBL005V1 LNB power supply demonstration board implements a DC-DC converter based on the LNBH23 device. The LNBH23 is an LNB supply and control IC with 2 step-up and an I C interface. It is used to power an LNB on a dish antenna for reception of satellite TV signals. The LNBH23 is an integrated solution for supplying/interfacing satellite LNB modules in accordance with international standards. This solution is simple, inexpensive, shows very good performance and has a low external component count. The LNBH23 demonstration board includes an 2 I C bus interface and an internal 22 kHz tone generator that is factory-trimmed to comply with widely accepted standards, and can be controlled through the DSQIN pin (TTL compatible). This allows immediate DiSEqC data encoding. Due to the fully integrated step-up DC-DC converter, it works with a single input voltage supply source ranging from 8 V to 15 V. April 2009 Doc ID 15562 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Circuit schematic STEVAL-CBL005V1 1 Circuit schematic Figure 1. Schematic diagram 2/4 Doc ID 15562 Rev 1 C2 +12V +12V 0.1F Power Driver & Logic C1 100F L2 L1 R1 22H Ferrite 100 D1 Bead C7 STPS2L30A 0.1F C8 D3 0.22F 1N4007 100F C5 C3 100F LX Vcc Vcc-L C4 C6 0.47F 0.47F C9 10F VoTX P-GND D4 L3 220H BAT43 Vup VoRX Output (VoRx) TP R415Ohm C10 Vup D2 TVS 0.22F BAT43 13/18 (VCTRL) C11 LNBH23 SCL 0.22F BY-PASS DSQOUT DSQIN C12 10nF SDA DETIN R3 EXTM 10Kohm TTX ADDR A-GND ISEL R2 11K=0.75A Iout (RSEL)