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{"cards":[{"_id":"266548b5dc82bca083000026","treeId":"266548d0dc82bca083000024","seq":23039118,"position":1,"parentId":null,"content":"Because many people do not understand the problem, they always have to go to the dimming circuit to find the problem, which is futile. Using step-down constant current source problems will be less, because if the original power supply voltage is higher than the load voltage, when the LED brightness is to low-key, the load voltage is reduced, so you still need step-down constant current source. But if the forward current is very low, the load voltage of the LED also becomes very low, then the buck ratio is very large, it may be beyond the normal working range of the buck type constant current source, and will make it unable to work and produce flicker. LED working at low brightness for a long time may reduce the efficiency of the step-down constant current source and increase the temperature rise, so it can not work. \n\nCommon-Cathode CC <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/3203aw.html\" style=\"color: #333;\">3203AW</a> 7-Segment digit <a href=\"http://www.xlitx.com/datasheet/3203AW.pdf\" style=\"color: #333;\">3203AW</a> LED Common-Anode CA <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/3203bw.html\" style=\"color: #333;\">3203BW</a> Display <a href=\"http://www.xlitx.com/datasheet/3203BW.pdf\" style=\"color: #333;\">3203BW</a> 0.30 inch\n0.32 inch <a href=\"http://www.xlitx.com/datasheet/3231AS.pdf\" style=\"color: #333;\">3231AS</a> LED Common-Cathode CC <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/3231as.html\" style=\"color: #333;\">3231AS</a> 7-Segment digit <a href=\"http://www.xlitx.com/datasheet/3231BS.pdf\" style=\"color: #333;\">3231BS</a> Display <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/3231bs.html\" style=\"color: #333;\">3231BS</a> Common-Anode CA\n\n<hr style=\"border:1px solid;\">\n\n<a href=\"https://gingkoapp.com/led-load-voltage-must-be-lower.html\" style=\"color: #333;\">LED load voltage must be lower</a>\n<a href=\"https://gingkoapp.com/led-brightness-low-key-with-reduced-voltage.html\" style=\"color: #333;\">LED brightness low-key with reduced voltage</a>\n<a href=\"https://gingkoapp.com/different-leds-with-current-and-output-curves.html\" style=\"color: #333;\">Different LEDs with current and output curves</a>\n<a href=\"https://gingkoapp.com/the-working-ratio-change-led-brightness.html\" style=\"color: #333;\">The working ratio change LED brightness</a>\n<a href=\"https://gingkoapp.com/led-heat-dissipation-technology.html\" style=\"color: #333;\">LED heat dissipation technology</a>\n<a href=\"https://gingkoapp.com/led-lamp-work-is-stable.html\" style=\"color: #333;\">LED lamp work is stable</a>\n<a href=\"https://gingkoapp.com/heat-management-with-high-brightness-led.html\" style=\"color: #333;\">Heat management with high brightness LED</a>\n<a href=\"https://gingkoapp.com/heat-dissipation-for-highlight-led.html\" style=\"color: #333;\">Heat dissipation for highlight LED</a>\n<a href=\"https://gingkoapp.com/led-device-to-extract-heat-from-p-n-junction.html\" style=\"color: #333;\">LED device to extract heat from P-N junction</a>\n<a href=\"https://gingkoapp.com/led-lamp-surface-radiation-heat-treatment.html\" style=\"color: #333;\">LED Lamp surface radiation heat treatment</a>"}],"tree":{"_id":"266548d0dc82bca083000024","name":"LED brightness low-key with reduced voltage","publicUrl":"led-brightness-low-key-with-reduced-voltage"}}