PWM Dimming Control9 i1 G, I) R1 B; N O. n: J
The PWM signal is connected to EN pin to adjust the feedback voltage (VFB) then LED current is also changed. The EN pin is built-in components of filter to regulate PWM signal become a DC voltage. The DC voltage is valid from 0.25V to 2.25V. The feedback voltage and LED current keep constant when the DC voltage is higher than 2.25V. The PWM signal is recommended above 10KHz. 5 h! h! g. k _3 p9 d g4 b% s ! L7 P9 f' |. V* y$ w" SVFB = VEN / 10 F+ o# D, t3 E+ `! Q
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短路掉 EN 上的 1K 電阻 R15 試試看！" c, R" X- ]# `) M; _; T3 u
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发表于 2016-11-9 19:19
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发表于 2016-11-10 08:34
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