Allegro MicroSystems’ LED driver integrated circuit portfolio supports a wide range of applications including:
- Signage and video displays
Backlights for cell-phones, notebook computers and consumer products
- Projectors and projection TVs
- Segmented alphanumeric displays
- Automotive lighting
- Architectural, decorative, and entertainment lighting
Some representative devices include the following, which are also summarized in Tables 1 and 2:
The A6279 is a 16-channel constant-current driver for video and variable message displays. It features open LED detection, thermal shutdown, undervoltage lockout and staggered output turn-on to reduce current surges and EMI. The A6279 outputs can sink up to 90 mA.
The A6278 is an 8-channel version of the A6279. The A6277 also has eight channels, which can be dimmed to 50% via an external input; each channel can sink up to 150 mA.
The A6280 is a 3-channel driver for controlling RGB clusters of LEDs in signage and architectural lighting. It integrates a 10-bit PWM controller for each channel, allowing up to one billion color combinations per RGB pixel. Each channel also integrates a 7-bit DAC to calibrate the white point. The A6280 can sink up to 150 mA per channel, or a total of 450 mA per device. The A6280 can accommodate an external clock, for receiving serial data and for PWM brightness control, of up to 5 MHz.
The A8430, A8431, A8480, and A8481 are 1.2MHz boost regulator WLED drivers designed for portable electronics applications utilizing an LCD display. These devices drive serial strings of LEDs.
The A8434, A8435, and A8530 are 1MHz charge-pump WLED drivers also for portable electronics, but for LEDs connected in parallel. These devices offer choices and flexibility in WLED connection topology, control methods, and features sets.
The A8500 is a boost regulator WLED driver operating at up to 2 MHz, with 8-string capability. This device is ideal for medium-display applications such as GPS, navigation, notebook, desktop monitor, and small LCDTV applications.
About Allegro MicroSystems
Allegro MicroSystems, Inc. is a global leader in developing, manufacturing, and marketing high-performance power integrated circuits and Hall-effect sensors. Allegro is a wholly owned subsidiary of Sanken Electric Company, Ltd., a billion dollar company based in Saitama, Japan, which manufactures semiconductors, discrete components, LEDs, and switch mode power supplies.
With over 2,500 employees worldwide, Allegro is headquartered in Worcester, Massachusetts, where its design, manufacturing, test, marketing, and customer service departments are located in a 250,000 sq. ft. facility. It also has other manufacturing plants as well as sales, design, and marketing offices worldwide. Allegro is ISO 9001: 2000, ISO 14001 and ISO/TS 16949: 2002 registered and has received quality awards from leading manufacturers worldwide. |
