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AN2711 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN2711
Description  The cost of power LEDs is rapidly decreasing
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2711 Datasheet(HTML) 8 Page - STMicroelectronics

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Doc ID 14425 Rev 3
Figure 3.
Line voltage (yellow) and line current (green) into the unloaded EMI filter
With the dimmer phased back, when the Triac fires the current rings repeatedly through
zero, and the holding current comes and goes. The thyristor may turn off until it is again
triggered by the pulse generator.
Figure 4.
Thyristor current due to L-C ringing
1.2
Damping circuits
If the Triac is to remain in control, current reversals between triggering and the voltage zero
crossing must be eliminated. STMicroelectronics has developed a way to do this without
violating existing patents, and a patent for this technique has been applied for. The patent is
licensed to anyone using ST semiconductors at no charge.
Figure 5 shows a damping network according to our patent application. C5 and R1 provide
holding current to the Triac until the filter ringing dies down. If properly sized, ringing is
minimized with little loss. The values shown are appropriate for about 30-60 W output.


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