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AN2713 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN2713
Description  LNB power supply based on the LNBH23 supply
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2713 Datasheet(HTML) 19 Page - STMicroelectronics

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AN2713
Other application circuits
Doc ID 14431 Rev 1
19/40
Figure 8.
Fast transition timing control with 22 kHz tone
If the internal 22 kHz tone generator is activated (TEN I2C bit or DSQIN pin is set high), at
T1 set low the VSEL I2C bit or VCTRL pin and after 25 ms, 18 V to 13 V LNB transition time
is elapsed at T2.
4.2
Reverse voltage and lightning surge protection
Figure 9 shows a suggested schematic to improve output circuit protection in applications
where:
●
TVS diode with Vclamp voltage of 25 V is required
●
an external power supply source could force a reverse DC voltage of 25 V on the LNB
bus



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