TLC5948ADBQ

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Power management integrated circuits (PMICs) are designed to provide voltage and current levels that electronics need. PMICs regulate input power to meet different applications\' needs, and are popularly used in consumer, automotive and industrial electronic systems. LED drivers are a type of PMIC specifically designed to power and control LEDs. The TLC5948ADBQ is a 24-channel LED driver developed by Texas Instruments and is capable of providing both current and voltage control to meet LED drive requirements.

The TLC5948ADBQ’s application field includes mobile phone and portable devices backlight, indoor light color temperature conversion, display and other LED related backlighting solutions. It features an integrated output transistor allowing maximum 24/26 channel outputs. The supply current for each channel is also very low, making it an efficient choice for portable and low-power applications.

In addition, the TLC5948ADBQ has multiple features, such as Digital Brightness Control, Color Mapping and Constant Current Limit Control. These features, along with its wide range of input voltage (2.5V to 5V), make it an extremely flexible and versatile LED driver solution.

The working principle of the TLC5948ADBQ is based on pulse-width modulation (PWM). Two separate PWM channels are implemented, one for dimming control and one for color temperature control.

For dimming control, the PWM signal is generated internally by the integrated oscillator. This internally generated signal is used to determine the LED current. The LED current is set to 60-80% of its maximum rated current by varying the Duty Cycle. This allows precise control of the LED backlight brightness.

The PWM signal for color temperature control is generated externally by a microcontroller. This signal is then routed to the TLC5948ADBQ, and it changes the LED behavior to affect its color temperature. The Duty Cycle is set to either 100% to create a cool color temperature or decreased to generate a warmer color temperature.

The TLC5948ADBQ is an ideal solution for portable and industrial lighting applications. Its small size, high efficiency, multiple control features and wide supply voltage range make it a great and cost-effective choice for both current and voltage controlled LED driving.

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