Circuits & Schematics Light: led - 4

31. Line-powered driver lights up high-power LEDs
    Circuits Supply Light ON Semiconductor NCP1200 MTD1N60E
    .. Capacitor C 3 stabilizes the feedback network's current and carries a 400 V rating in case of an open circuit in the LED string. An RC network comprising R 5 and C 4 provides a small amount of lowpass filtering to the CS pin. Figure 2. ...
    01-04-2020

32. 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

33. 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
34. 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
35. 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
36. 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
37. 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
38. 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
39. 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
40. 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

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