SU3C20AC

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The SU3C20AC chip is a voltage regulator developed by Shanghai Jingya Semi-conductor Co., Ltd. It is a synchronous step-down converter with high-efficiency, high-precision, low-cost and small size, which is widely used in various fields. The chip uses open-loop voltage control Topology, switched at the PWM Controller, and uses synchronous rectifier to reduce component count and increase power efficiency.

Application Field

The SU3C20AC chip is suitable for various applications such as mobile phones, digital products, computers, electronic toys, LED lighting, automotive products, etc. It is widely used in audio-visual systems, automotive electronics, uninterruptible power supplies, portable power supply systems, and other forms of portable high-efficiency applications.

Working Principle

The SU3C20AC chip is based on open-loop voltage regulation. Its working principle can be divided into two parts: the constant voltage regulation and the constant current limiting. The chip adopts the internal PWM control signal generated by the clock oscillation circuit, and the output voltage is controlled by the internal voltage reference. In the constant current limiting mode, the output current is limited to about 1/2 of the maximum output current set by the system design.

The chip adopts synchronous rectification technology, which can decrease the power consumption of the switching loss and reduce the power consumption. At the same time, it has a current limitation function to ensure the load current won\'t exceed the maximum current.

The chip also has a built-in soft start circuit, which can make the output voltage gradually rises when the device is started. This process makes sure that the output power can reach the setting value in time. In addition, the chip has an undervoltage lockout circuit, which can prevent the device from start-up when the input voltage is too low.

Conclusion

The SU3C20AC chip is a synchronous step-down converter with high-efficiency, high-precision, low-cost and small size. It uses open-loop voltage control and synchronous rectifier technology, and has a current limitation and soft start function. It has a wide range of applications and is used in mobile phones, digital products, computers, electronic toys, LED lighting, automotive products, etc.

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