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AN1902 Datasheet(PDF) 23 Page - STMicroelectronics

Part # AN1902
Description  DEVICES TO DRIVE 58W TL TUBES
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1902 Datasheet(HTML) 23 Page - STMicroelectronics

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AN1902 - APPLICATION NOTE
Figure 25: Start-up phase
Figure 26: First oscillation cycles after the diac strike
4.4.2 PRE-HEATING PHASE
The preheating frequency has to be fixed in order to reach a current level enough to heat the cathodes
without tube ignition. Figure 27 shows the main waveforms of the LS device.
LS DIAC pin voltage
LS VCC pin voltage
LS VCC pin voltage
Mid point voltage
LS collector current
LS DIAC pin voltage



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