TPS8268090SIPT

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TPS8268090SIPT Application Field and Working Principle

The TPS8268090SIPT is a DC-DC converter developed by Texas Instruments designed for applications requiring high voltage, low power conversion. The TPS8268090SIPT is a synchronous buck converter that operates from an input voltage of 8V to 26V and has an output voltage of 0.9V and an output current of 6A. It is ideal for applications such as high precision ADCs, FPGAs, microcontrollers, ASICs, and power amplifiers. The TPS8268090SIPT uses a switching frequency of 1.2MHz and has a switching ripple of 30 mV.

The device combines a low RDS(ON) internal synchronous buck MOSFET with a fast transconductance error amplifier and a voltage loop compensation network for use in applications requiring fast transient response and high accuracy voltage regulation. The output voltage is adjustable from 0.7V to 1.3V and the device contains an over-temperature protection circuit. The device is packaged in a thermally enhanced 9x6x2.5mm TSOP package.

Working Principle

The TPS8268090SIPT is a synchronous DC-DC buck converter and utilizes a buck topology to convert a DC input voltage to a lower DC output voltage with a high efficiency. The device consists of an internal high-side synchronous buck MOSFET switch and a synchronous rectifier on the low-side. The device has the ability to constructively and destructively increase the current throughout the device based on the changes in output voltage. When the output voltage increases, the duty cycle of the synchronous MOSFET increases, allowing more current to flow through the device, resulting in higher output voltage and corresponding power. Conversely, when the output voltage decreases, the duty cycle is decreased, resulting in less current flow, therefore decreasing the output voltage.

The device employs voltage loop control which is an open-loop control system. The voltage loop control system monitors the output voltage of the device and adjusts the duty cycle accordingly to maintain the desired output voltage. The control circuit consists of an error amplifier, a voltage reference, and a feedback network. The error amplifier is responsible for comparing the actual output voltage to the reference voltage and generating an error signal. The error signal is then passed through the feedback network which consists of an operational amplifier and a current source, and is used to adjust the duty cycle of the PWM driver. The output voltage is regulated by the coincidence of the actual output voltage signal and the voltage reference.

Conclusion

The TPS8268090SIPT is a DC-DC converter developed by Texas Instruments designed for applications requiring high voltage, low power conversion. The TPS8268090SIPT employs a synchronous buck topology to convert an input voltage to a lower output voltage. The device has an adjustable output voltage from 0.7V to 1.3V and contains an over-temperature protection circuit. The device utilizes a voltage loop control system to regulate the output voltage, consisting of an error amplifier, a voltage reference, and a feedback network. The TPS8268090SIPT is ideal for applications such as high precision ADCs, FPGAs, microcontrollers, ASICs, and power amplifiers.

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