Demonstation board: power supply for LNB
Features
■ Complete interface between LNBs and I²C bus
■ Built-in DC-DC converter for single 12 V supply
(8 V to 15 V Vin range) operation and high
efficiency (typ. 93%@0.5 A)
■ Compliant with main satellite receivers output
voltage specification
■ Accurate built-in 22 kHz tone generator meets
widely accepted standards (patent pending)
■ Fast oscillator start-up facilitates DiSEqC™
encoding
■ Built-in 22 kHz tone detector supports
bidirectional DiSEqC™ 2.0
■ Over-load and over-temperature internal
protections with I²C diagnostic bits
■ Output voltage and output current level
diagnostic feedback by I²C bits
■ LNB short circuit dynamic protection
■ +/- 4 kV ESD tolerant on output power pins
■ Based on LNBH24 in QFN32 package
STEVAL-CBL006V1
based on the LNBH24 (QFN32)
Data Brief
STEVAL-CBL006V1
Description
The demonstration board STEVAL-CBL006V1
implements a DC-DC converter based on the
device LNBH24. It gives good performance in a
simple and cheap way and minimum external
components are required. It includes all the
functions that allow the design of a dual tuner
STBs with supplying/interfacing function in
accordance with the international standards. It
also includes an I²C bus interface and, thanks to a
fully integrated step-up DC-DC converter, it works
with a single input voltage supply in the range of 8
V to 15 V.
February 2009 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematic STEVAL-CBL006V1
1 Circuit schematic
Figure 1. Schematic diagram
LNBOUT_B
DxB
L3b
220µH
31
VoRX-B
SCL
13
TVS B
C13b 10nF
R4b
15 ohm
C10b
220nF
SDA
12
C9b 10µF
D2b
D4b
BAT43
1N5818
B-R
32
6
D
D
A
VoTX-B
14
ADDR-A
27
BYP
A-GND
1-30
A-
DN
G-P
10
9
Vup-B
33
P-GND-B
D3b
1N4007
C11
470nF
TVS A
LNBOUT_A
DxA
C13a 10nF
10nF
10nF
L3a
C9a 10µF
25
VoTX-A
35
1N4007
D3a
VCTRL-B
36
EXTM-B
220µH
D4a
1N5818
26
VoRX-A
C12a
15 Ohm
R4a
BAT43
D2a
R3a 10K
C10a
220nF
17
DETIN-A
DSQIN-A
DSQOUT-A
L
N
BH2
C12b
R3b 10K
3
2
5
4
181516
TTX-B
TTX-A
DSQIN-B
DETIN-B
DSQOUT-B
4
20
VCTRL-A
19
EXTM-A
ISEL-A
ISEL-B
Vup-A
22
LX-A
34
21
11
Vcc-L
Vcc
29
28
LX-B
8
C6a
470nF
Rsel-B
100µF
C5a
Bead
L2a
Ferrite
100µF
C3a
470nF
C4a
STPS130A
D1a
11KOhm
Rsel-A
11KOhm
22µH
L1a
Vin
+12V
2/4
C6b
470nF100µF
R1
100 Ohm
C8
220nF
C7
100nF
100nF
C1 C2
100µF
22µH
L1b
D1b
I2C
STPS130A
C5b
L2b
Bead
Ferrite
C3b
100µF
C4b
470nF
AM03218v1
STEVAL-CBL006V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
19-Feb-2009 1 Initial release.
3/4
STEVAL-CBL006V1
y
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