ST CBL005V1 User Manual

LNB power supply demonstration board based on the LNBH23

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 suite") software included in the kit

■ Implements the LNBH23 in a QFN32 package

STEVAL-CBL005V1

Data brief

Description

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
step-up and an I
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.

2

C interface. It is used to power

STEVAL-CBL005V1

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

Output (VoRx)

TVS

D3

C12

1N4007

C9

10µF

220µH

L3

D4

15Ohm

R4

BAT43

D2

C11

BAT43

C10

0.22µF

0.22µF

10nF

R3

10Kohm

VoRX

BY-PASS

DETIN

11K=0.75A Iout

ISELA-GND

R2

R1

100

C8

0.22µF

VoTX

Vcc-L

(RSEL)

+12V

Driver & Logic

Vcc

C7

C2

0.1µF
L1L2

0.1µF

22µH

LNBH23

ADDR

LX

DSQOUT

DSQIN

SDA

EXTM

TTX

Power

+12V

C1

100µF

D1

STPS2L30A

100µF

C3

P-GND

13/18 (VCTRL)

Vup

SCL

C4

0.47µF

Bead

Ferrite

C5

100µF

C6

0.47µF
TP

Vup

2/4 Doc ID 15562 Rev 1