AN2713 Datasheet, PDF (1/40 Pages) STMicroelectronics – LNB power supply based on the LNBH23 supply

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
LX
P-GND
Rsense
Vup
VoRX
VoTX
TTX
EXTM
DSQIN
VCTRL
ISEL
TTX
ADDR SDA SCL
Vcc Byp Vcc-L
Preregulator
+U.V.lockout
+P.ON reset
EN
VSEL
VSEL
TTX
ITEST
EN
I²C interface
VOUT Control
Linear Post-reg
+Modulator
+Protections
+Diagnostics
TEN
I²C Diagnostics
22KHz
Oscill.
22KHz Tone
Amp. Diagn.
22KHz Tone
Freq. Detector
LNBH23
A-GND
DETIN
DSQOUT
November 2009
Doc ID 14431 Rev 1
1/40
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