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TP1550 Datasheet(PDF) 10 Page - Billiton Ltd. |
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TP1550 Datasheet(HTML) 10 Page - Billiton Ltd. |
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10 / 13 page ![]() 南京拓品微电子有限公司 NanJing Top Power ASIC Corp. Rev1.1 (4)恒流/限压方案 2:驱动多颗串联 LED 方案,以两颗为例 驱动两颗 LED 时,由于 TP1550 输出最高典型值为 5V,所以采用如图 11 的原理图。次级两组 变压器的匝数比为 1:1 时,VB=2VA,确保了 LED 两端的电压。 图 11 恒流驱动两颗 LED 原理图 图 11 所示电路为驱动多颗 LED 串联的典型应用,次级与辅助部分电路与图 8 电路相同 |
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