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AN2713 Datasheet(PDF) 1 Page - STMicroelectronics

Part # AN2713
Description  LNB power supply based on the LNBH23 supply
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2713 Datasheet(HTML) 1 Page - STMicroelectronics

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November 2009
Doc ID 14431 Rev 1
1/40
AN2713
Application note
LNB power supply based on the LNBH23 supply
and control IC with step-up and I²C interface
Introduction
This application note is intended to provide additional information and suggestions for the
correct use of the LNBH23 device. All waveforms shown are based on the demonstration
board (order code STEVAL-CBL003V1) described in Section 5.
The LNBH23 is an integrated solution for supplying/interfacing satellite LNB modules. It
provides good performance in a simply and cheaply way, with minimum external
components necessary. It includes all functions needed for LNB supply and interfacing, in
accordance with international standards. Moreover, it includes an I2C bus interface and,
thanks to a fully integrated step-up DC-DC converter, it functions with a single input voltage
supply ranging from 8 V to 15 V.
Figure 1.
LNBH23 internal block diagram
SDA
SCL
LNBH23
ADDR
A-GND
I²C Diagnostics
I²C interface
DSQIN
Vup
VoRX
VoTX
LX
22KHz
Oscill.
Rsense
EN
VSEL
Linear Post-reg
+Modulator
+Protections
+Diagnostics
ITEST
TTX
EN
VSEL
VOUT Control
EXTM
P-GND
Preregulator
+U.V.lockout
+P.ON reset
Byp
Vcc
Vcc-L
ISEL
TTX
TEN
DSQOUT
DETIN
22KHz Tone
Amp. Diagn.
22KHz Tone
Freq. Detector
TTX
VCTRL
www.st.com


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