Circuits & Schematics Light: led - 4

31. HB-LED flashing beacon repurposes switching regulator
    Circuits Supply Light ON Semiconductor MC34063A
    .. a distress signal on highways, a direction pointer for parking lots, hospitals, and hotels, etc. The circuit uses a power LED, and provides more light than a typical incandescent lamp flasher. Use of a 6 V or 12 V SLA lantern battery makes ...
    02-11-2019

32. Enhanced VLED Driver Updates JFET Constant-Current Source
    Circuits Supply Light IXYS IXTP3N50D2
    .. Awtrey Electronic Design By pairing a visible-light LED (VLED) with a depletion-mode MOSFET, you can create an efficient, controllable current-source driver. ...
    25-07-2019

33. LED driver provides software-controlled intensity
    Circuits Supply Light Maxim MAX1932
    .. driving forces in electronic lighting. Increased reliability and ruggedness (versus other lighting technologies) gives the LED a bright future indeed. Vendors in recent years have introduced many ICs for driving LEDs, but the problem of ...
    02-07-2019
34. Tricolor LED emits light of any color or hue
    Circuits Analogue Design Light Analog Devices ADA4091-2 ADR1581
    .. a mixture of blue, red, and green. The circuit in Figure 1 produces all three colors through an Broadcom ASMT-YTB0 tricolor LED. You can produce a wide range of colors by varying the current in the blue, red, and green LEDs. Figure 1. ...
    12-05-2019
35. 1.5V battery powers white-LED driver
    Circuits Supply Light Maxim MAX1722 MAX4073
    .. to 62 mA with input voltages as low as 1.2 V, making it suitable for use with a 1.5 V, single-cell battery. Because a white LED draws negligible load current until the output voltage rises above 3 V, the boost converter can start with input ...
    24-04-2019
36. Use A Boost Converter To Create An Auto-Dimmable LED Flashlight
    Circuits Supply Light STMicroelectronics L6920 TS951
    .. flashlight, it would indicate a low-battery condition and would last longer. Typically, the forward voltage of a white LED is 3 to 5 V. Therefore, if the input voltage drops below 3 V, a boost converter can drive the LED. Figure 1 shows ...
    24-04-2019
37. Buck regulator controls white LED with optical feedback
    Circuits Analogue Design Supply Light Texas Instruments LM2575 LM358
    .. Gadre EDN There is much interest in LED-based lighting due to the availability of high-power, high-efficiency white and other-color LEDs (Reference 1). ...
    15-02-2019
38. Use "Extra" LED Driver Channel To Provide Constant-Voltage Source
    Circuits Supply Light Linear Technology LT3476
    .. (Walker) Bai Electronic Design LED applications are booming: backlighting for LCD TVs, projectors, and computer displays, camera flashes, and vehicle ...
    27-11-2018
39. Protect power-LED strings from overcurrent
    Circuits Analogue Design Light Texas Instruments LM317
    .. the LEDs’ forward voltages. The LEDs’ forward-voltage tolerance is as high as 20%, and the voltages change with LED temperature and aging. A current mirror performs this task well. If an LED breaks, it can cause destructive ...
    27-11-2018
40. LED current regulator has low dropout
    Circuits Analogue Design Light ON Semiconductor BC327 BC549C
    .. voltage. Its main advantage is a very small dropout voltage, which can be less than 100 mV. The design could find use on LED strips, where the voltage can vary along the length due to resistive drop, and small voltage changes result in ...
    20-11-2018

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