L6699DTR STMicroelectronics, L6699DTR Datasheet - Page 31

• Manufacturer Part Number: L6699DTR
• Description: AC/DC Switching Converters Enhanced High Volt Res CTRL 600V
• Manufacturer: STMicroelectronics

Specifications of L6699DTR

• Product Category: AC/DC Switching Converters

L6699
Line sensing function
Figure 22. Line sensing function: internal block diagram and timing diagram
While the line undervoltage is active there is no switching activity, therefore the V
voltage
CC
(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 Vin
or give rise to
OFF
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 V
through a
CC
Ω
resistor in the hundred k
.
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