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R6986 датащи(PDF) 22 Page - STMicroelectronics

номер детали R6986
подробное описание детали  38 V, 2 A synchronous step-down switching regulator
PDF  62 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

R6986 датащи(HTML) 22 Page - STMicroelectronics

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Functional description
R6986
22/62
DocID026996 Rev 2
5.3.1
Ratiometric startup
The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the
R6986 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 nR6986 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
--------------------------------
nR6986 3
4
AT
SS
0.85V
---------------------------
==



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