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A6985F Datasheet(PDF) 22 Page - STMicroelectronics

No. de pieza A6985F
Descripción Electrónicos  38 V 500 mA synchronous step-down switching regulator
PDF  77 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6985F Datasheet(HTML) 22 Page - STMicroelectronics

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Functional description
A6985F
22/77
DocID027738 Rev 2
5.3.1
Ratiometric startup
The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the
A6985F 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 n A6985Frepresents 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
nA6985F SSGAIN
ISSCH T
SS
VFB
--------------------------------
nA6985F 3
4
AT
SS
0.85V
---------------------------
==



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