Powering Eight LEDs using TPS61042 Current LED Driver
The TPS61042 is a step-up (boost) converter designed specifically for driving LEDs with precision. It features an integrated switch that allows it to efficiently convert a lower voltage input to a higher voltage output, suitable for powering multiple LEDs in series. The device operates with a wide input voltage range, which enhances its versatility in various battery-operated applications.
In this application, the TPS61042 is configured to drive eight white LEDs in series. The efficiency of 81% indicates that the circuit is optimized to minimize power loss, which is critical in portable electronics where battery life is a primary concern. The driver regulates the output current through feedback mechanisms that ensure consistent brightness across all LEDs, even as the input voltage fluctuates due to battery discharge.
The schematic will typically include external components such as inductors, capacitors, and resistors that are crucial for the stability and performance of the circuit. An inductor is used to store energy and release it at a higher voltage, while input and output capacitors help filter voltage ripples, ensuring a smooth output current. A sense resistor may also be included to monitor the current flowing through the LEDs, enabling precise control over brightness.
Overall, the TPS61042 is a robust solution for applications requiring efficient LED driving capabilities, making it suitable for modern handheld devices that demand high performance and energy efficiency.The herein schematic diagrams TPS61042 Current LED driver powering 8 LEDs with 81% efficiency at 3.6V/18.6mA. TPS61042 used to be applied in applications such White LED Supply for Backlight/Sidelight Displays (PDA, Pocket PC, Smart phones, etc)
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