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AN2640 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN2640
Description  Intelligent multipower digital ballast for fluorescent lamps
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2640 Datasheet(HTML) 9 Page - STMicroelectronics

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AN2640
Half-bridge design criteria
9/36
Figure 6.
54 W lamp power
Figure 7.
80 W lamp power
During the preheating phase in this system the half-bridge works at fixed frequency and the
selected preheating frequency is the best choice according to the selected lamp
specifications.
This working frequency guarantees the right preheating current for all lamps that can be
driven by this system.
After tube recognition the microcontroller sets the right run frequency for the connected
lamp.



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