软启动增强了 LED 驱动程序

摘要： 模仿自然的软启动的白炽灯，此电路使用内置 LED 驱动 IC (MAX16832) 的热折弯保护。从而避免了否则指示灯由展示的恼人和几乎瞬时启动。

Maxim > App Notes > Display Drivers LED Lighting
Keywords: LED drivers, soft start, NTC resistors, constant-current sources, current-foldback protection Aug 17, 2010

APPLICATION NOTE 4481
Soft-Start Enhances LED Driver
By:Fons Janssen, Senior Member of the Technical Staff


Abstract:To emulate the natural soft start of an incandescent bulb, this circuit makes use of the thermal-foldback protection built
into an LED-driver IC (MAX16832). It thereby avoids the annoying and almost instantaneous startup otherwise exhibited by LEDs.

A similar version of this article appeared in the March 11, 2009 issue of Power Management Designline ( EE Times ).

One of the less obvious differences between incandescent light bulbs and LED-based lights is the speed at which they start up. An
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