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NCP1294EDR2G Application Field and Working Principle

The NCP1294EDR2G is part of ON Semiconductor’s family of standard power management integrated circuits (PMICs). As an offline switcher, it is commonly used for various applications, such as adapter, battery charger, and other low power electronic device. It is also referred to as a synchronous converter, a buck converter, or a step-down converter.

The NCP1294EDR2G features a high efficiency over the entire load range, an ON/OFF control, and a low EMI designed specifically for data communication applications. It also offers several functional features, including output overcurrent protection, short-circuit protection, output overvoltage protection and thermal shutdown protection. The features are designed to comply with safety standards such as IEC 60335-1 and UL60950, making the NCP1294EDR2G suitable for various applications.

Working Principle

The NCP1294EDR2G is an offline buck converter, which can step down the input voltage to the desired output voltage. It works using synchronous rectification to deliver a low voltage output with efficiency and excellent low-output ripple current. It operates in three different modes: continuous conduction mode (CCM), discontinuous conduction mode (DCM), and current mode control (CMC).

In CCM mode, the output current is constant and the inductor is never completely discharged. This mode is most commonly used when the output current is not higher than the current level corresponding to the zero-voltage transition of the output voltage waveform. In DCM mode, the output current is a pulse width modulated rectangular waveform, with the current in each cycle being zero at the beginning and ending of each cycle. This mode is best used when the output current is higher than the load’s peak current. Lastly, in CMC mode, the current waveform is more complex and varies with time.

The NCP1294EDR2G offers a comprehensive set of protection functions to ensure stable operation. It includes a wide input supply range for extended operation, overvoltage protection, undervoltage protection, output overcurrent protection, and thermal protection. The protection functions are designed to be robust and reliable, ensuring that the NCP1294EDR2G performs stable in even the harshest of applications.

Conclusion

The NCP1294EDR2G is a reliable and cost effective offline switcher for application requiring a buck converter, such as battery chargers, adapters, and other low power electronic devices. It offers a wide input supply range and provides several protection functions to ensure stable operation. As part of ON Semiconductor’s family of standard power management integrated circuits, the NCP1294EDR2G is an ideal choice for low power applications requiring high efficiency.

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