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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN4130 데이터시트(PDF) 32 Page - STMicroelectronics |
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AN4130 데이터시트(HTML) 32 Page - STMicroelectronics |
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32 / 41 page  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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