TPS622312DRYT Integrated Circuits (ICs)

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TPS622312DRYT Application Field and Working Principle

In the field of power management, switching regulators are widely used in analog circuit designs due to the advantages of high efficiency, high power factor and high frequency. This paper briefly introduces the application fields and working principle of TPS622312DRYT, a typical DC/DC switching regulator.

1. Introduction

The TPS622312DRYT, designed by TI, is a synchronous step-down converter. The integrated converter with the main components is a fixed frequency current-mode algorithm, which can perform 1MHz high-frequency switching frequency, making the solution size and cost lower. Its typical operating junction temperature range is -40℃ ~ 125℃. The TPS622312DRYT can efficiently supply a 0.8A output current (<= 1.5A for only few μs) and supports a wide input voltage range from 2.7V to 6.5V.

2. Application Fields

Due to its good performance and excellent adaption to the environment, TPS622312DRYT has a wide range of application fields, including but not limited to the following:

• Voltage source to supply power for small electronic devices, such as portable electronic components like cellphones and PDAs, car radios, and Bluetooth.
• Low noise and low power consumption can be used as a power supply for medical devices or industrial process monitoring system.
• The boost control design of a thermal protection system powered by a single NiMH/NiCD battery.

3. Working Principle

The TPS622312DRYT is a synchronous stepped-down DC-DC switching regulator. When the input voltage is turned on, the built-in startup circuit will start to charge the soft-start capacitor, and the voltage on the capacitor will start to increment. During the soft-start phase, the output defaults to 0v. When the voltage on the capacitor reaches the set threshold, the critical loop of the regulator starts to control.

When the input voltage U_in is higher than the output voltage U_out, the MOS, usually being a P-Channel MOSFET, will be turned on. The current flowing through the MOS will be added to this loop, which is called the switching current carried by the inductor L. When the inductor current reaches a preset current threshold, the MOS will be turned off, and the inductor current will transfer from the MOS to the output capacitor C_out, and the inductor radiate the energy stored in the inductor to the output capacitor. This is the Output Voltage Regulation Cycle.

At the same time, the loop control core will compare the voltage on the output coupling capacitor C_out with a reference voltage, adjust the ON time of MOS, and control the output voltage. The output voltage U_out will keep stable.

Subsequently, the frequency of the output voltage with C_out as the zero point is determined by the frequency of the loop regulation circuit.

Conclusion

The TPS622312DRYT is a synchronous step-down converter with high efficiency and wide input voltage range. It is especially suitable for applications with strict space and energy requirements. It can also be used as a power supply for medical or industrial process monitoring devices with low noise and low power consumption. By understanding its application fields and working principle, designers can make better decisions when choosing DC/DC switching regulators to meet their needs.

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