LED Driver Includes Brightness Control Function

Toshiba Electronics Europe has launched a 16-channel light-emitting-diode (LED) driver that combines brightness control with a built-in pulse-width-modulation (PWM) greyscale capability. The TB62721 is suitable for traffic signs, information boards and other large-panel displays requiring the accurate and reliable control of multiple-colour LEDs.

The new driver can deliver output voltages of up to 38V and provide constant currents of between 2mA and 80mA per channel using a single resistor. All of the functionality needed to deliver 256-step output brightness control is integrated into the device, while the onboard PWM capability provides 65,536-step greyscale control per channel. Both the output-to-output accuracy and IC-to-IC accuracy of the TB62721 are 1.5 per cent.

This allows large displays based on multiple LED chains and drivers to maintain consistent brightness levels within very tight tolerances. Designed for secure, reliable operation, the TB62721 features onboard protection, including thermal-shutdown, output-open and short-circuit protection, and a power-on-reset function.

The TB62721 is supplied in an SSOP24 package and can operate with input voltages ranging from 3.3V to 5.0V. Interfaces are fully BiCMOS compatible and the device can handle serial input data rates to 30MHz.

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