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L6699D bảng dữ liệu(PDF) 31 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]
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L6699D bảng dữ liệu(HTML) 31 Page - STMicroelectronics

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L6699
Line sensing function
Doc ID 022835 Rev 2
31/38
Figure 22.
Line sensing function: internal block diagram and timing diagram
While the line undervoltage is active there is no switching activity, therefore the VCC voltage
(if not supplied by another source) continuously oscillates between the startup and the
UVLO thresholds, as shown in the timing diagram of
Figure 22.
The LINE pin, while the device is operating, is a high impedance input connected to high
value resistors, so it is prone to pick-up noise,. This might alter VinOFF or give rise to
undesired switch-off of the IC during ESD tests. It is possible to bypass the pin to ground
with a small film capacitor (e.g. 1-10 nF) to prevent any malfunctioning of this kind.
If the function is not used the pin can be pulled high by connecting it to VCC through a
resistor in the hundred k
Ω.



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