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{"cards":[{"_id":"26652d52dc82bca08300003e","treeId":"26652d66dc82bca08300003c","seq":23039116,"position":1,"parentId":null,"content":"It is difficult to achieve accurate light output control by adjusting forward current. LED is a diode that can be switched on and off quickly. It can switch at a speed of more than microseconds. It is unmatched by any LED light-emitting device. Therefore, as long as the power supply is changed into a pulse constant current source, by changing the pulse width of the method, you can change LED brightness. This method is called pulse width modulation (PWM) dimming. If the pulse period is TPWM and the pulse width is ton, the working ratio D(or porosity ratio) is ton/ TPWM. The brightness of the LED can be changed by changing the working ratio of the constant current source pulse. Different brightness is suitable for different occasions, according to the need to choose the appropriate brightness.\n\n0.32 inch <a href=\"http://www.xlitx.com/datasheet/CL3231AH.pdf\" style=\"color: #333;\">CL3231AH</a> LED Common-Cathode CC <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/cl3231ah.html\" style=\"color: #333;\">CL3231AH</a> 7-Segment digit <a href=\"http://www.xlitx.com/datasheet/CL3231BH.pdf\" style=\"color: #333;\">CL3231BH</a> Display <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/cl3231bh.html\" style=\"color: #333;\">CL3231BH</a> Common-Anode CA\n0.32 inch <a href=\"http://www.xlitx.com/datasheet/3312AS.pdf\" style=\"color: #333;\">3312AS</a> LED Common-Cathode CC <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/3312as.html\" style=\"color: #333;\">3312AS</a> 7-Segment digit <a href=\"http://www.xlitx.com/datasheet/3312BS.pdf\" style=\"color: #333;\">3312BS</a> Display <a href=\"http://www.lanpade.com/7-segment-led-dot-matrix/3312bs.html\" style=\"color: #333;\">3312BS</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":"26652d66dc82bca08300003c","name":"The working ratio change LED brightness","publicUrl":"the-working-ratio-change-led-brightness"}}