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
STEVAL-CBL005V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
06-Apr-2009 1 Initial release.
Doc ID 15562 Rev 1 3/4
STEVAL-CBL005V1
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4/4 Doc ID 15562 Rev 1
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