NCP1012ST130T3

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NCP1012ST130T3 Application Field and Working Principle

NCP1012ST130T3 is a widely used offline AC/DC converter chip produced by ON Semiconductor. It is widely used in AC/DC medical equipment applications, specifically for medical appliances, home appliances and other household applications.

NCP1012ST130T3 is a monolithic offline DC/DC converter integrated circuit with the ability to run up to 130V and 0.2A. This device has soft start operation and can operate over a wide input voltage range, making it suitable for a wide range of applications. It has a peak current mode control (PСMC) topology that helps in reducing the component count and simplifies the intermediate power conversion functions.

The NCP1012ST130T3 application is primarily suited for medical and home appliance applications, such as medical equipment, Lighting, HVAC, Fans and pumps, Motors, telecom power supplies, and consumer appliances, as well as some industrial applications.

The working principle behind the NCP1012ST130T3 is the peak current mode control (PCMC) which is a combination of pulse width modulation (PWM) and average current control (ACC). PWM modulates the current in a switching regulator, and the ACC regulates the average current. By combining the two, it is possible to obtain excellent dynamic performance.

The pulse width modulation (PWM) is the technique used to switch the AC input voltage into a DC output voltage. This is done by switching the AC voltage on and off at a specific frequency. In the PCMC mode, the PWM is used to drive a pair of transistors Q1 and Q2. The transistors are used as current switches which are controlled by the PCMC. The PCMC is responsible for regulating the load current by providing a feedback voltage of the load current, which is used to adjust the duty cycle of the transistors.

The average current control (ACC) works in conjunction with the PWM. The ACC ensures that the load current is kept within the specified limits. The ACC works by providing a feedback voltage of the load current, which is then compared to a reference voltage, and if the current is higher than the reference, the duty cycle of the transistors is decreased, and if it is lower than the reference, the duty cycle is increased.

To sum it up, the NCP1012ST130T3 is a monolithic DC/DC converter integrated circuit with the ability to run up to 130V and 0.2A. It is primarily suited for applications such as medical equipment, Lighting, HVAC, Fans and pumps, Motors, telecom power supplies, and consumer appliances. It uses a peak current mode control (PCMC) topology that helps in reducing the component count and simplifies the intermediate power conversion functions.

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