PURPOSE: An apparatus and a method for supplying constant current of a light emitting diode are provided to supply constant current to a light emitting diode. CONSTITUTION: A constant current driving unit(110) supplies current to a light emitting diode array(120). A current sensing unit(130) ...
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an electrode assembly having a plurality of needle electrodes for penetrating a selected tissue and delivering an electrical pulse, wherein the needle electrodes are mounted in an array around a sterile injection channel of a support structure; a current waveform generator in electrical communication wi...
LM3424 October 13, 2009 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs General Description The LM3424 is a versatile high voltage N-channel MosFET controller for LED drivers . It can be easily configured in buck, boost, buck-boost and SEPIC topologies. In addition, ...
PURPOSE: To provide a light emitting diode array current source which drives a multiple LED load at a constant current. CA Buraun,チャールズアレンブラウン,BI Saiyaa,... 被引量: 0发表: 1994年 带有过温保护和自适应调节的LED驱动电路 LED驱动电路重新开始工作.;An Light Emitting Diode(LED)...
1. A constant current driving apparatus which drives a plurality of loads at a same current, comprising: a plurality of constant current driving semiconductor integrated circuits less in number than a total number of the loads; and a reference signal producing circuit for producing a reference sign...
These circuits are a must for operating high-power light emitting diode (LED) arrays. The circuit above is simple, can be a little unstable due to temperature drift with Q1 causing the current drift. That problem is minor compared to power supply drift can cause far greater instability. ...
I Input for PWM dimming. Connect a logic-level PWM signal to this pin to enable and disable the power MOSFET and reduce the average light output of the LED array. — Ground pin. Connect this pin to system ground. I Current sense feedback pin. Set the current through the LED array by...
The intention relates to an alternating-current controlled silicon LED constant-current source in a dimming mode, which is used for an illuminating system. The LED constant-current source comprises an AC TO DC power supply, an LED dimmable constant-current source, an LED light source, a V/F ...
• LED Drivers: Buck, Boost, Buck-Boost, and SEPIC • Indoor and Outdoor Area SSL • Automotive • General Illumination • Constant-Current Regulators 3 Description The LM3421-Q1 and LM3423-Q1 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. ...