TPS92074DR

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LED drivers are a key component of the power management chain in LED systems. In order to achieve the desired performance, they must offer features such as high efficiency and low power dissipation.The TPS92074 DR from Texas Instruments is a high-efficiency LED driver designed to drive a single LED or multiple LED strings. This driver provides a high LED current accuracy of ± 5%, a wide switching frequency range from 300 kHz to 1.2 MHz and adjustable current limit. It supports a wide operating voltage range and is industry\'s first synchronous rectifier-based, constant on-time, step-down DC-DC converter.The TPS92074 DR offers excellent dimmer compatibility and supports forward, reverse, and RSD/LDE dimming. It is also designed to meet EMI (electromagnetic interference) stringent requirements and supports a wide range of protection features such as over-current protection (OVP), over-temperature protection (OTP) and under-voltage lockout (UVLO).The TPS92074 DR is ideal for applications such as automotive, industrial, and general lighting. It provides high efficiency and low power dissipation for LED lighting applications in a very small footprint. It is also well suited for applications such as decorative and architectural lighting, where long-term reliability and low cost are key design parameters.The TPS92074 DR has an input voltage range of 4.5-20V and an output current range of 10-240mA. It features an adjustable switching frequency to achieve an optimal LED dimming experience even at high LED loading. It also includes an enable control input (EN) and an adjustable current limit setting that allows the user to dial in the current limit to the desired level.The TPS92074 DR operates as a constant on-time, synchronous rectifier based step-down converter. Its operating principle is based on the assumption that the current through the LEDs is constant and equal to the current limit set point. At the start of the switching cycle, the inductor current ramps up until it reaches the current limit set point. Once the current limit set point is reached, the switch is shut off and the current in the inductor starts to decay. During the off time, the inductor stores the energy and when the switch opens, its energy is transferred to the load (LEDs).The synchronous operation of the TPS92074 DR ensures low duty cycle operation, resulting in low power dissipation and high efficiency. The device also has a low output impedance, which leads to less voltage drop-out when driving high currents.Overall, the TPS92074 DR is a high-efficiency, synchronous rectifier-based, constant on-time, step-down DC-DC converter ideal for driving single or multiple strings of LEDs. It supports a wide range of protection features, adjustable switching frequency and adjustable current limit. It is also well-suited for applications where long-term reliability and low cost are key design parameters.

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