Circuits & Schematics Light: led - 3

21. 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

22. 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

23. 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
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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

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