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AN3115 Scheda tecnica(PDF) 21 Page - STMicroelectronics

Il numero della parte AN3115
Spiegazioni elettronici  LNB power supply based on the LNBH23L supply and control IC with step-up and I²C interface
PDF  28 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3115 Scheda tecnica(HTML) 21 Page - STMicroelectronics

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AN3115
Component selection guidelines
Doc ID 16830 Rev 3
21/28
2.9
Undervoltage protection diode (D2)
During a short-circuit event on the LNB output, negative voltage spikes may occur on the
VoRX pin. To prevent reliability problems, a low-cost Schottky diode with low VF clamping
voltage is used between this pin and GND (see D2 in Figure 6). It is recommended to place
the protection diode cathode as close as possible to the VoRX pin.
Figure 13.
Tone amplitude vs. R9 value
0.3
0.35
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.51
1.52
2.5
3
3.5
4
4.5
R9 value (kohm)



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