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Electronics Buyers' Guide

Electronics Manufacturing & Production Handbook 2019


 

Linear LED drivers
2 May 2012, Opto-Electronics

Supertex has introduced CL8800 and CL8801 – sequential, linear LED drivers designed to drive long strings of low-cost, low-current LEDs in solid-state replacements for fluorescent tubes, incandescent bulbs and CFL bulbs.

Both ICs minimise driver circuit component counts, requiring just four or six resistors and a diode bridge in addition to the IC. Two to four additional components in the circuit provide transient protection, and neither capacitors nor magnetic components are required. Because the ICs are multi-stage linear current regulators, there are no high-frequency switching currents and, thus, no need for a front-end EMI filter.

The CL8800 is intended for 230 V a.c. input, while the CL8801 is for 120 V a.c. input. Luminous efficiencies of greater than 115 lm/W are achievable with both ICs. The CL8800 has six current regulator outputs while the CL8801 has four. These outputs tap a string of series parallel LEDs, and the regulators sink current at each tap and are sequentially turned on and off automatically, tracking the input sine wave voltage.

Voltage across each regulator is minimised when conducting, providing typical efficiency of greater than 90%. Output current at each tap is individually resistor-adjustable. Cross regulation, as the IC switches from one regulator to another, provides smooth transitions.

The current waveforms of both ICs can be tailored to optimise for input voltage range, line/load regulation, output power/current, efficiency, power factor, THD, dimmer compatibility and LED utilisation. Both ICs are compatible with phase dimming with the addition of an RC network.


Credit(s)
Supplied By: Communica
Tel: +27 12 657 3500
Fax: +27 12 657 3550
Email: sales@communica.co.za
www: www.communica.co.za
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Further reading:

  • 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 ...
  • RGB LED drivers
    27 February 2019, Avnet South Africa, Opto-Electronics
    Texas Instruments introduced a new family of LED drivers with integrated, independent colour mixing, brightness control and a power-saving mode. The LP5018, LP5024, LP5030 and LP5036 enable smooth, vivid ...
  • Rack-mount and desktop 19” enclosures
    30 January 2019, Communica, Enclosures, Racks, Cabinets & Panel Products
    Hammond Manufacturing has introduced 4U high versions and added extended 559 mm depths to all heights of its RM family of 1U to 4U 19” rack-mounting and desktop enclosures. 1U to 3U half-width versions ...
  • 90 CRI LEDs with high efficacy
    30 January 2019, Altron Arrow, Opto-Electronics
    Cree has launched XLamp eTone LEDs, a set of chip-on-board (COB) LEDs that delivers 90 colour rendering index (CRI) light quality at the same efficacy as today’s standard 80 CRI LEDs. They also deliver ...

 
 
         
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