TPS51124RGET

TPS51124RGET Application Field and Working Principle

The TPS51124RGET is a Switching Controller targetted to voltage regulator and DC/DC converter applications. It provides tight current limit and uses bootstrap power to drive highside MOSFETs in Buck, Buck-Boost, and Sepic topologies. The key features of the TPS51124RGET include a designed to drive two single-ended, positive MOSFETs, an Ultra-Low Voltage Detect, wide input voltage range of 1.4V to 23V, an ultra-low quiescent current of 100nA, fixed and adjustable output voltage up to 9V, an Precision enable control and selectable Current sources, Adjustable over-current protection and Thermal regulation, programmable rotation frequency from 100kHz to 1MHz, an PWM voltage mode control and adjustable switching frequency, and an adjustable Soft Start.

Application Field

The TPS51124RGET is particularly well suited for applications such as LED lighting, portable medical, consumer electronics, battery-powered consumer and infrastructure products and other long-term applications. The ease of use and high efficiency of this Switching Controller make it an ideal solution for most of these applications. The device is also highly integrated, as it integrates the current limiting circuitry into the device and only requires three external components to achieve a high performance, no-compromise solution.

Working Principle

The input signal applied to the device is a pulse width modulated (PWM) signal. The TPS51124RGET uses this signal to control the on-off cycles of the MOSFETs. The device can process a continuous signal as well as a single-cycle pulse. The device operates in Single-Cycle Per PWM Control mode, where each cycle of the PWM signal is used to control the on and off states of the MOSFETs. When the signal is low, the device turns off the MOSFETs and when the signal is high, the device turns on the MOSFETs.

The device integrates a number of functions such as over-current protection and thermal regulation. The over-current protection feature provides protection against possible over-current or thermal conditions. This is achieved by monitoring the voltage across the current sense resistor and shutting off the MOSFETs when the voltage exceeds a certain threshold. The thermal shutdown feature activates when the temperature of the device exceeds 170°C. The device will then shut off the MOSFETs, thereby preventing damage due to excessive heat.

The device allows for adjustable switching frequency and output voltage. The switching frequency is adjustable from 100kHz to 1MHz, while the output voltage is adjustable up to 9V. The device also has selectable current sources for a wide output voltage range and higher efficiency. In addition, the device has an adjustable soft-start which helps reduce in-rush current during startup.

Conclusion

In conclusion, the TPS51124RGET Switching Controller from Texas Instruments is an ideal solution for applications such as LED lighting, portable medical, consumer electronics, battery-powered consumer and infrastructure products and other long-term applications. With its wide input voltage range and adjustable switching frequency, output voltage and soft-start, it provides a high performance, no-compromise solution. In addition, with its current limiting and thermal shutdown features, the device provides protection against any over-current or thermal conditions.