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L6714 Fiches technique(PDF) 46 Page - STMicroelectronics

No de pièce L6714
Description  4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
PDF  70 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6714 Fiches technique(HTML) 46 Page - STMicroelectronics

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Soft start
L6714
46/70
15.3
Low-Side-Less startup
In order to avoid any kind of negative undershoot on the load side during start-up, L6714
performs a special sequence in enabling LS driver to switch: during the soft-start phase, the
LS driver results disabled (LS=OFF) until the HS starts to switch. This avoid the dangerous
negative spike on the output voltage that can happen if starting over a pre-biased output
(See Figure 17).
This particular feature of the device masks the LS turn-on only from the control loop point of
view: protections are still allowed to turn-ON the LS MOSFET in case of over voltage if
needed.
Figure 17. Low-Side-Less start-up comparison



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