本文介绍的LED驱动方案用于12VAC输入的MR16及类似的换代灯。该方案可配合磁变压器和电子变压器工作，支持磁变压器的前沿调光和电子变压器的后沿调光。电路中无需使用电解电容，从而有效延长了LED灯的工作寿命，因为电解电容是制约这类系统使用寿命的关键因素。Maxim > App Notes > Display drivers Power-supply circuits Keywords: MR16, LED, driver, dimmable, electronic transformer, 12VAC, lifetime, electrolytic, LM3404, Zetex Aug 04, 2010 APPLICATION NOTE 4708 LED driver solution for MR16 and similar retrofit lamps By: Piero Bianco Abstract: This application note presents an LED driver solution for MR16 and similar retrofit lamps. The circuit drives LEDs from a 12VAC input. The solution works with both magnetic and electronic transformers and is dimmable. It requires no electrolytic capacitors, which extends LED lamp life. Test setup and results are shown. Introduction This application note describes a proprietary solution that will drive LEDs off a 12VAC input for MR16 and similar retrofit lamps. This design can be used with both m……