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PWM调光的高亮度发光二极管( HB LED)的直流电压控制

资料介绍
摘要:此LED驱动电路包括迟滞控制器U1 ( MAX16820的) ,相关功率元件和控制电路的基础上的四运放U2 ( LMX324 ) 。 U1驱动从24V源5个高亮度发光二极管,使用唯一的电感L1 , MOSFET Q1的,赶上二极管D1 。

Maxim > App Notes > Display Drivers LED Lighting
Keywords: high-brightness LEDs, HBLEDs, hysteretic controllers, LED drivers, temperature-based current foldback Nov 19, 2010

APPLICATION NOTE 4509
DC Voltage Controls PWM Dimming of High-Brightness LEDs (HB
LEDs)


Abstract:This LED-driver circuit includes a hysteretic controller U1 (MAX16820), related power components, and a control circuit
based on the quad op amp U2 (LMX324). U1 drives five HB LEDs from a 24V source, using only inductor L1, MOSFET Q1, and
catch diode D1.

A similar version of this article appeared in the June 24, 2008 issue of Electronic Design magazine.

High-brightness LEDs (HB LEDs) are making inroads into the more traditional lighting that includes a DC distribution system (an
example is the 24V MR-16 track li……
PWM调光的高亮度发光二极管( HB LED)的直流电压控制
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