Circuits & Schematics Light: led - 3

21. Scheme provides high-side current sensing for white-LED drivers
    Circuits Supply Light Sipex SP6690
    .. phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To forward-bias these LEDs, a voltage of 10 to 16 V comes from an inductor-based boost regulator, such as an ...
    25-11-2020

22. Simple PWM Modulator Allows DC Control Signal To Drive LEDs
    Circuits Supply Light Maxim MAX4477
    LED-driver circuits can be dimmed by applying a variable duty cycle (pulse-width modulation, or PWM) to the LED. PWM ...
    25-11-2020

23. Pocket white-LED torch is power efficient
    Circuits Supply Light Fairchild BC559
    .. Design Idea describes a single white-LED torch, which can be housed in an empty glue-stick tube and has a long rechargeable-battery life. The circuit is ...
    03-11-2020
24. Use a CFL ballast to drive LEDs
    Circuits Supply Light International Rectifier IR53HD420
    .. field of view of a CCD camera in a machine-vision system. The circuit prototype uses a 2.7-mH inductor from a dead CFL. The LED current comprises dc current plus a small ripple current; keep the ripple current low for high efficiency and long ...
    02-09-2020
25. Flash an LED from ac-mains power
    Circuits Supply Light Fairchild LM317
    .. Babu EDN LED technology is opening the door to a variety of high-power-illumination applications. The circuit in Figure 1 can ...
    26-07-2020
26. Inverting buck-boost converter regulates LED current
    Circuits Supply Light Texas Instruments TPS40200D
    .. the fewest components for a switching regulator and the lowest overall cost compared with other topologies. Because the LED output is light, it may not matter from a system level that the LEDs are biased on with negative rather than ...
    05-07-2020
27. Minimize Input-Supply Ripple Current In LED Driver Applications
    Circuits Supply Light Intersil EL7801
    .. Godil Electronic Design Consumer-based LED applications have really taken off. You now find them in home lighting, airplane cabin lights, automobile lights, ...
    04-07-2020
28. Solar day lamp designs use passive and active current-limiting circuits
    Circuits Supply Light Solar STMicroelectronics TIP31C
    .. reduces. For design purposes we will use the values of V MP and I MP given in the specifications. Resistor current limiter LED lamps are easily available in the market. A typical lamp consists of a pre-assembled array of white LEDs mounted on ...
    23-06-2020
29. Cascaded converter boosts LED-drive capability
    Circuits Supply Light Texas Instruments LM3478
    .. the ultraviolet LEDs to offer an appropriate visible backlight. Although you may prefer to use a single high-powered white LED, high-powered ultraviolet LEDs appear to be unobtainable. This project uses 20 inexpensive LEDs offering 400 mW of ...
    12-06-2020
30. 36V, 2A LED Driver with 5000:1 PWM Dimming Meets CISPR 25 Class 5 EMI Limits with Silent Switcher Architecture
    Circuits Supply Light Analog Devices LT3932 LT3932-1
    .. Lawrence, Analog Devices Design Note 570 Introduction The LED backlights in automotive heads-up displays, infotainment systems, and dashboard lighting must be bright enough to ...
    12-06-2020

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