Driver delivers high-accuracy brightness control to large LED-based displays
Toshiba Electronics Europe (TEE) has expanded its family of LED drivers with a new device that can maintain constant currents of between 1.5mA and 90mA. Combining high-accuracy brightness control with a built-in PWM grey scale capability, the 16-channel TC62D722 is ideal for traffic signs, information boards and other applications built around multiple colour LEDs.
The integrated functionality of the new driver means that 256-step output brightness control can be achieved with the addition of just a single resistor. In addition, the on-board PWM capability offers 16-, 14-, 12- and 10-bit operation to deliver up to 65536-step grey scale control per channel.
Operating from a supply voltage of between 3.0V and 5.5V, the TC62D722 is rated for output voltages up to 17V. Channel-to-channel current accuracy is specified as ±1.5%, as is IC-to-IC accuracy. As a result the brightness of large displays built around multiple LED chains and drivers can be maintained within tight tolerances.
The TC62D722 features CMOS-compatible I/O interfaces and is available in 24-pin SSOP, HTSSOP24 and QSOP packages . These are pin-compatible with other members of constant current LED drivers. Comprehensive protection functionality includes thermal shutdown (TSD), automatic output open detection (OOD) and automatic output short circuit detection (OSD). A power-on-rest (PoR) capability and Output Delay function are also provided. The latter prevents the possibility of overcurrent conditions when all LEDs are switched on simultaneously by incorporating a short delay between channels.
Designed for optimum efficiency, the new driver features a standby current consumption of just 1µA. A small reference board for evaluation is available on request.
Toshiba Electronics Europe (TEE) is the European electronic components business of Toshiba Corporation, which is ranked among the world’s largest semiconductor vendors. TEE offers one of the industry's broadest IC and discrete product lines including high-end memory, microcontrollers, ASICs, ASSPs and display products for automotive, multimedia, industrial, telecoms and networking applications. The company also has a wide range of power semiconductor solutions. TEE was formed in 1973 in Neuss, Germany, providing design, manufacturing, marketing and sales and now has headquarters in Düsseldorf, Germany, with subsidiaries in France, Italy, Spain, Sweden and the United Kingdom. TEE employs approximately 300 people in Europe. Company president is Mr. Hitoshi Otsuka.
Toshiba Corporation is a world leader and innovator in pioneering high technology, a diversified manufacturer and marketer of advanced electronic and electrical products spanning information & communications systems; digital consumer products; electronic devices and components; power systems, including nuclear energy; industrial and social infrastructure systems; and home appliances. Founded in 1875, Toshiba today operates a global network of more than 740 companies, with 199,000 employees worldwide and annual sales surpassing US$73 billion.
For more company information visit Toshiba's web site at www.toshiba-components.com
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