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L6731B bảng dữ liệu(PDF) 17 Page - STMicroelectronics

tên linh kiện L6731B
Giải thích chi tiết về linh kiện  Adjustable step-down controller with synchronous rectification Dedicated to DDR Memory
PDF  24 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6731B bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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L6731B
Device description
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5.11
Minimum on-time (TON, MIN)
The device can manage minimum on-times lower than 100ns. This feature comes down from
the control topology and from the particular over-current-protection system of the L6731B. In
fact, in a voltage mode controller the current has not to be sensed to perform the regulation
and, in the case of L6731B, neither for the over-current protection, given that during the off-time
the valley-current-protection can operate in every case. The first advantage related to this
feature is the possibility to realize extremely low conversion ratios. Figure 10. shows a
conversion from 14V to 0.3V at 500KHz with a TON of about 50ns.
The on-time is limited by the turn-on and turn-off times of the MOSFETs.
Figure 10. 14V -> 0.3V@500KHz, 5A
50ns
VPHASE
IL
VOUT



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