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L6699D bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện L6699D
Giải thích chi tiết về linh kiện  Enhanced high voltage resonant controller
PDF  38 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6699D bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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L6699
Current sensing, OCP and OLP
Doc ID 022835 Rev 2
27/38
Figure 20.
Soft-start and delayed shutdown upon overcurrent timing diagram (safe-
start details are not shown)
In applications where continuous operation of the converter is needed even under overload
conditions, the delayed shutdown function can be disabled by simply grounding the DELAY
pin.
If the voltage on the ISEN pin reaches 1.5 V, the second comparator is triggered. Switching
is stopped immediately and both the internal switch that discharges CSS and the 350 µA
current source on the DELAY pin are forced continuously on. As V(DELAY) equals 3.5 V the
350 µA generator is turned off, so that CDelay is slowly discharged by RDelay. The L6699
restarts when V(DELAY) falls below 0.3 V.



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