摘要：一个简单的，传统方法与固定偏置电压和镇流电阻在穷人之间的LED匹配的亮度白色发光二极管（LED）供电。这是由于宽的LED正向电压的变化，有时低至1V 。一种廉价的LDO线性稳压器可以提高240％亮度匹配的LED正向电压调节LED电流和偏压。Maxim > App Notes > DISPLAY DRIVERS POWER-SUPPLY CIRCUITS Keywords: white LEDs, linear regulators, LDO, dc-dc converters, ballasting, ballast resistors Mar 27, 2002 APPLICATION NOTE 1020 LDO Linear Regulator Improves White LED Brightness Matching Abstract: A simple, traditional method of powering white light-emitting-diodes (LEDs) with fixed bias voltage and ballast resistors result in poor brightness matching between LEDs. This is due to wide LED forward voltage variation, sometimes as much as 1V. An inexpensive LDO linear regulator can improve brightness matching by 240% by regulating both LED current and bias voltage in response to the forward voltage of one of the LEDs. Since their invention a few years ago, white light-emitting-diodes (LEDs) have been steadily gaini……