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AN2713 데이터시트(PDF) 18 Page - STMicroelectronics

부품명 AN2713
상세설명  LNB power supply based on the LNBH23 supply
PDF  40 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN2713 데이터시트(HTML) 18 Page - STMicroelectronics

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AN2713
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Doc ID 14431 Rev 1
The following steps must be taken to ensure the correct implementation of 18 to 13 V
transition with the VoTx addition circuit shown in Figure 6:
●
T0: to start the 18 V to 13 V transition the TTX function must be activated at least
0.5 ms before setting the VSEL I2C bit (set HIGH TTX I2C bit or TTX pin).
●
T1: set LOW VSEL I2C bit.
●
T2: after 30 ms, 18 V to 13 V LNB transition time is elapsed at T2. The 30 ms delay is
valid to ensure 18 V to 13 V complete transition in case of Cbus=100 µF and
Iout=0 mA. The delay time can be modified with different Cbus capacitance and output
current value.
Figure 7.
Fast transition timing sequence



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