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AN4130 Datasheet(PDF) 18 Page - STMicroelectronics |
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AN4130 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 41 page  Power converter performance AN4130 18/41 Doc ID 023315 Rev 1 3.7.2 Electrical The plot below was taken near the peak of line voltage, where both voltage and current stresses are greatest. Figure 29. Component electrical stress Where: ● Yellow = drain voltage ● Magenta = diode voltage ● Blue = drain current. Note the VERY small overshoot in the drain voltage and diode voltage waveforms. This is due to the transformer's low leakage inductance, about 0.6 microhenries. The current ringing is due to the snubber capacitor on the secondary side resonating with the leakage inductance at FET turn-on and turn-off. The circulating current loop on the PC board is very small and is only weakly coupled to the AC line, so it does not cause an EMI problem. 3.8 Summary Performance is excellent for an LED driver of this size and simplicity. The added bonuses of dimmability and power factor correction compel consideration of this design. |
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