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L6756D bảng dữ liệu(PDF) 25 Page - STMicroelectronics

tên linh kiện L6756D
Giải thích chi tiết về linh kiện  2/3/4 phase buck controller for VR10, VR11 and VR11.1 processor applications
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L6756D bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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L6756D
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5.6.1
LSLESS start-up
In order to avoid any kind of negative undershoot on the load side during start-up, L6756D
performs a special sequence in enabling the drivers for both sections: during the soft-start
phase, the LS driver results to be disabled (LS = OFF - Gx set to HiZ and DRVON = 0) until
the first PWM pulse. After the first PWM pulse, Gx outputs switches between logic “0” and
logic “1” and DRVON is set to logic “1”.
This particular sequence avoids the dangerous negative spike on the output voltage that
can happen if starting over a pre-biased output.
Low-side MOSFET turn-on is masked only from the control loop point of view: protections
are still allowed to turn-ON the low-side MOSFET in case of overvoltage if needed.
Figure 10.
LSLESS start-up: enabled (left) and disabled (right)



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