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L6730 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện L6730
Giải thích chi tiết về linh kiện  Adjustable step-down controller with synchronous rectification
PDF  52 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6730 bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Device description
L6730 - L6730B
20/52
Doc ID 11938 Rev 3
5.7
Driver section
The high-side and low-side drivers allow for the use of different types of power MOSFETs
(also multiple MOSFETs to reduce the RDSON), maintaining fast switching transitions. The
low-side driver is supplied by VCCDR while the high-side driver is supplied by the BOOT pin.
A predictive dead time control avoids MOSFETs cross-conduction maintaining very short
dead time duration (see Figure 13.).
The control monitors the phase node in order to sense the low-side body diode recirculation.
If the phase node voltage is less than a certain threshold (–350 mV typ.) during the dead
time, it will be reduced in the next PWM cycle. The predictive dead time control does not
work when the high-side body diode is conducting because the phase node does not go
Figure 12.
Sink mode disabled: Inductor current during and after soft-start (L6730)
Vout
Vss
Vcc
IL



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