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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6699 датащи(PDF) 31 Page - STMicroelectronics |
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L6699 датащи(HTML) 31 Page - STMicroelectronics |
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31 / 38 page  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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