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Electronics Buyers' Guide

Electronics Manufacturing & Production Handbook 2019


 

Tiny converter drives four white LEDs
25 September 2002, Opto-Electronics

Linear Technology's LT1937 is an 84% efficient, constant current white LED driver packaged in an SC-70 or a ThinSOT (profile under 1 mm). 1,2 MHz switching frequency enables extremely small externals, namely a 22 µH inductor and 0,22 µF output capacitor. The LT1937 has been optimised to drive up to four white LEDs on 3,2 V supply (6 LEDs from 5 V supply). Efficiency and <1 mA shutdown current provide optimal battery time, while input voltage range 2,5 V to 5,5 V makes it ideal for use in single cell Li-Ion and multicell Alk/NiMH battery devices. 1,2 MHz constant switching architecture minimises both input and output noise. The device delivers constant current to series-connected LEDs, ensuring uniform brightness. High accuracy feedback voltage (95 mV+ 9 mV) contributes to high efficiency and provides good brightness control even when partially dimmed to current levels of 6-8 mA.


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Further reading:

  • LED flicker, and how to prevent it
    28 August 2019, Avnet South Africa, Opto-Electronics
    With the growing popularity of LED lighting, especially now that very cheap LED luminaires are coming to the market, flicker is becoming more of a problem. Flicker, a repetitive switching on and off ...
  • Digital fibre-optic sensor
    28 August 2019, Vepac Electronics, Opto-Electronics
    The DFS digital fibre-optic sensor series from Tri-Tronics is designed to provide reliable detection using plastic fibre-optic light guides. The slim-line housing with protective lid will fit in a variety ...
  • All-in-one light pipe system
    28 August 2019, Vepac Electronics, Opto-Electronics
    Bivar’s Zero Light Bleed adaptor technology, with built-in surface-mount LED, channels light directly to the lens, eliminating disruptive light bleed. The all-in-one adaptor system is built with optimum ...
  • High-intensity colour LEDs
    31 July 2019, Würth Elektronik eiSos, Opto-Electronics
    Würth Elektronik has expanded its LED portfolio with a particularly compact model family. The WL-SMCC series of SMT chip LEDs, available in 0402 and 0603 packages, is characterised by a full-surface lens ...
  • RGB LEDs for decorative lighting
    26 June 2019, Würth Elektronik eiSos, Opto-Electronics
    Würth Elektronik’s new WL-SFTW and WL-SFTD series of RGB LEDs are targeted at accent and decorative lighting, optical displays as well as industrial applications. Thanks to their PLCC contacting design, ...
  • 4,3” TFT LCD module
    26 June 2019, iCorp Technologies, Opto-Electronics
    The RFE430W-AYW-DNN from Raystar is a 4,3” TFT display with a resolution of 480 x 270 pixels. It has a built-in SC7283 driver IC and supports an RGB 24-bit interface, with brightness of 500 nits, an aspect ...
  • High-intensity colour LEDs
    26 June 2019, Würth Elektronik eiSos, Opto-Electronics
    Würth Elektronik has expanded its LED portfolio with a particularly compact model family. The WL-SMCC series of SMT chip LEDs, available in 0402 and 0603 packages, is characterised by a full-surface lens ...
  • LEDs recognised for achieving natural light spectrum
    29 May 2019, NuVision Electronics, Opto-Electronics
    Seoul Semiconductor’s SunLike range of natural spectrum LEDs, first announced in 2017, have gone on to be recognised as an innovative technology for human-centric lighting at global lighting awards held ...
  • Infrared detectors
    29 May 2019, Würth Elektronik eiSos, Opto-Electronics
    Würth Elektronik eiSos is expanding its optoelectronics portfolio. Following infrared LEDs, the company now also offers a wide range of matching detectors. Developers of various infrared applications ...
  • Optical filters for electronic displays
    30 April 2019, Actum Electronics, Opto-Electronics
    Instrument Plastics’ extensive product range of optical filters for electronic displays includes EMC shielding, MRI and polycarbonate windows, lamination, diffusers, polarisers, glass and plastic filters, ...
  • FPGA-based video/imaging solution
    27 March 2019, Avnet South Africa, Opto-Electronics
    Microchip Technology released the new PolarFire FPGA imaging and video solution to address the challenges of developing complex computer algorithms which enable systems to capture and display information ...
  • LED lighting controller
    27 March 2019, EBV Electrolink, Opto-Electronics
    STMicroelectronics has combined its LED control know-how with advanced power technologies in a new all-in-one LED control chip designed to enable luminaires to save more energy and deliver better user ...

 
 
         
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