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L6985F Arkusz danych(PDF) 20 Page - STMicroelectronics

Numer części L6985F
Szczegółowy opis  Internal current limiting
PDF  65 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6985F Arkusz danych(HTML) 20 Page - STMicroelectronics

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Functional description
L6985F
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DocID027836 Rev 2
4.3.1
Ratiometric startup
The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the
L6985F devices.
Figure 10. Ratiometric startup
As a consequence all the internal current generators charge in parallel the external
capacitor. The capacitor value is dimensioned accordingly with Equation 12:
Equation 12
where nL6985F represents the number of devices connected in parallel.
For better tracking of the different output voltages the synchronization of the set of
regulators is suggested.
CSS
nL6985F SSGAIN
ISSCH T
SS
VFB
--------------------------------
nL6985F 3
4
AT
SS
0.85V
---------------------------
==



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