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A6986 Arkusz danych(PDF) 22 Page - STMicroelectronics

Numer części A6986
Szczegółowy opis  38 V, 2 A synchronous step-down switching regulator with 30 µA quiescent current
PDF  67 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986 Arkusz danych(HTML) 22 Page - STMicroelectronics

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Functional description
A6986
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DocID026211 Rev 6
5.3.1
Ratiometric startup
The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the
A6986 device.
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 nA6986 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
nA6986 SSGAIN
ISSCH T
SS
VFB
--------------------------------
nA6986 3
4
AT
SS
0.85V
---------------------------
==



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