摘要：一个普通的LED的亮度控制电路采用电控电位器（ EPOT ）实现数字控制LED亮度。然而，更换一个RC网络的EPOT减少IC的数量和所需数量的控制线。 Maxim > App Notes > Display Drivers Keywords: PWM, pulse-width modulation, LED brightness control, LED current regulator, LED driver Jul 19, 2006 APPLICATION NOTE 3866 Low-Power PWM Output Controls LED Brightness Abstract:A common brightness-control circuit for LEDs uses an electrically controlled potentiometer (EPOT) to achieve digital control of the LED brightness. Replacing the EPOT with an RC network, however, reduces both the IC count and the required number of control lines. A system in which a microcontroller or programmable logic controls one or more LEDs often requires the capability of controlling LED brightness. A common approach for achieving this adjusts an electrically controlled potentiometer (EPOT), which in turn, controls the LED dr……