TFS761HG

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TFS761HG application fields and working principles
TFS761HG is a PMIC (Power ManagementIC) AC/DC converter, developed by Toshiba Corporation. It integrates a buck-boost DC/DC converter with high efficiency, low ripple and low noise output, with a wide input voltage range of 4.5V to 26V. This makes it ideal for use in industrial, medical, automotive and other applications, where compact solutions are required. With several features, such as pre-bias startups, hysteretic start-up and smooth transition between buck/boost switching, this IC is designed to maximize system efficiency and reduce power losses. Furthermore, the TFS761HG has built-in protection circuits, such as thermal shutdown, over-current and brown-out detection.

The TFS761HG is a dual-mode buck-boost DC/DC converter that can operate either in buck-boost or in buck-only mode. It uses synchronous rectification with very low output ripple for maximum efficiency and minimum noise. The IC can provide a maximum output current of 5A, with a maximum output voltage of 5.5V. The operating frequency is set by an external resistor, and can range from 50kHz to 400kHz.

When operating in buck/boost mode, the TFS761HG is capable of providing an output voltage that is lower, equal to, or higher than the input voltage. In this mode, the output voltage is determined by the resistance of the external resistor connected between the EN and FB pins, according to the equation RVref = (Vout/Vref)xRV[3]. The FB pin can also be used to adjust the output voltage set point in buck-only mode.

The TFS761HG also has several built-in protection functions. These include thermal shutdown, over-current protection and brown-out detection. The thermal shutdown function can be set by connecting two external resistors to the TS and GND pins. If the chip\'s temperature exceeds the set temperature, the IC will shut down to prevent damage. The over-current protection circuit will reduce the output current in case an over-load situation is detected. Lastly, the brown-out detection will prevent the output voltage from dropping below a certain level in case of a power failure. These functions all contribute to the reliability and safety of the IC, making it an ideal choice for demanding applications.

In conclusion, the TFS761HG is a highly versatile, efficient and reliable PMIC AC/DC converter for a variety of applications. It features low output ripple, wide input voltage range, low noise operation, pre-bias startup, hysteretic start-up and a built-in protection circuit. With these features, the TFS761HG is sure to provide an excellent performance.

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