TC105303ECTTR

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TC105303ECTTR Application Field and Working Principle

The TC105303ECTTR is a PMIC (Power Management Integrated Circuit) that is specifically designed to act as a DC DC switching controller. It is used to regulate the voltage of a direct current (DC) circuit by controlling the output voltage of a switching power supply circuit in order to maintain a stable voltage in the event of a load variation.

This device is typically used in a variety of applications with demanding power processing requirements such as Switching Mode Power Supplies (SMPS), Automotive applications, Medical Equipment, Industrial Control, Telecom/Networking and even Computer/Mobile Processing.

Working Principle

The TC105303ECTTR follows the a flyback topology. It utilizes an isolated switching power supply with a pair of synchronous rectifiers to convert AC mains (or DC) into isolated outputs with low ripple. The output voltage is proportional to the turns ratio of the transformer, which can be adjusted accordingly by connecting different transformers or PWM modulations.

The output voltage is then regulated using pulse-width modulation (or PWM) to control the duty cycle of the transformer\'s primary current, while the external control feedback circuit monitors the output voltage. The control feedback circuit will shift the feedback voltage accordingly when the output voltage voltage is not within the device\'s pre-set dwell time for regulating it.

Over-Voltage Protection and Soft Start

The TC105303ECTTR also offers comprehensive over-voltage protection and soft-start functions that protect the power stage from damage due to overvoltage or current-load changes. These functions also prevent inrush current that can cause damage to the output capacitors.

The over-voltage protection protects the device from damage caused by output short circuit or open circuit. It is able to detect the power stage voltage exceed the predetermined value and then force the device to stop the switching operation and turn off the external power Mosfet.

The soft-start function provides a way to gradually increase the output voltage without initial surge current. This function can reduce the output capacitors current and power consumption, which can help to reduce the total system power loss. In addition, it also reduces the start-up time and improves system reliability.

Conclusion

The TC105303ECTTR is a versatile and reliable DC-DC switching controller that is perfect for a variety of demanding power processing applications. It offers complete protection from overvoltage, short circuit and open circuit, and a complete soft-start function for improved output capacitors current and power consumption.

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