PWM Dimming Control( j" [6 t8 Y5 ]' L' Z1 k
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. ! v" M% Q# ^/ w2 X# N2 D. m H3 s+ f2 {
VFB = VEN / 103 u( T; X4 \ m5 o& ?# O( K9 m
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/ v: Z# s! L7 D+ B' b8 g" w. l短路掉 EN 上的 1K 電阻 R15 試試看！6 ~/ }- @0 J) ?% F+ L
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发表于 2016-11-9 19:19
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发表于 2016-11-10 08:34
