Dallas, Tex. − Texas Instruments Inc. (TI) has introduced three DC/DC LED drivers aimed at improving dimming performance and color rendering in indoor and outdoor lighting. The devices are said to simplify white color tuning for high-color rendering and ultra-low dimming in professional-grade indoor and outdoor LED lighting applications.
The TPS92660 two-string LED driver and TPS92640/1 synchronous buck controllers tackle challenges of precise color and brightness control for creating high quality light engines for commercial area lighting, including architectural and retail displays, as well as LED-based projection systems and automotive running lights.
The TPS92660, an 80-V input voltage, two-string LED driver, integrates one DC/DC buck regulator and one linear channel for two-color, typically white plus red, LED mixing. Using the I2C interface and one-time programmable ROM, a lighting manufacturer can precisely tune the white correlated color temperature (CCT) and brightness of the luminaire during production to deliver high lumen quality in area, retail and architectural lighting, according to TI. This eliminates the need for expensive binned LEDs, reducing system costs. Analog or pulse width modulation (PWM) input signals can be used for brightness and color adjustment after ROM programming.
The TPS92640 and TPS92641 are 85-V input voltage, adjustable frequency, synchronous buck DC/DC LED controllers with industry-leading contrast ratios that deliver smooth, deep dimming profiles required in indoor/outdoor area lighting and LED projectors, said TI. The controllers use analog and PWM inputs resulting in dimming ratios of 500:1 and 2500:1, respectively. Continuous-conduction mode operation preserves dimming linearity, which enables the TPS92640/1 to provide true analog "dim to zero" capability. The TPS92641 adds one input and one output pin for 20,000:1 ratio parallel shunt FET dimming.
Pricing: The TPS92660 (20-pin PowerPad TSSOP), TPS92640 (14-pin PowerPad TSSOP) and TPS92641 (16-pin PowerPad TSSOP), are priced at $1.50, $1.75, and $1.85, respectively, in quantities of 1,000.