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L6986 Datasheet(PDF) 21 Page - STMicroelectronics

Part # L6986
Description  38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current
PDF  68 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986 Datasheet(HTML) 21 Page - STMicroelectronics

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DocID025376 Rev 7
21/68
L6986
Functional description
68
4.3.1
Ratiometric startup
The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the
L6986 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 nL6986 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
nL6986 SSGAIN
ISSCH T
SS
VFB
--------------------------------
nL6986 3
4
AT
SS
0.85V
---------------------------
==



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