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AN4130 Datasheet(PDF) 32 Page - STMicroelectronics

Part # AN4130
Description  LED driver using the HVLED815PF
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4130 Datasheet(HTML) 32 Page - STMicroelectronics

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Design guidance
AN4130
32/41
Doc ID 023315 Rev 1
Figure 40.
Input transient at 1 A/div, 50 µs/div
Where:
●
Yellow = Triac dimmed line voltage
●
Magenta = line current, scale below.
The rather high current spike at the leading edge is due to the input capacitor charging
through the fusible resistor. A small inductor may be added to soften this if space permits,
but it does no harm.
Even if Triac dimming is not required, the damper should be used. The EMI filter can ring up
the supply voltage to very high levels at turn-on if it is not present, and instability has been
seen without the damper under normal operating conditions.



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