NCP1271D100R2G

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The NCP1271D100R2G is a monolithic integrated circuit and is part of the offline switchers (flyback and forward) as well as AC DC converters, also known as PMICs (Power Management Integrated Circuit) family. It has several features such as output power up to 25W, a fixed frequency current-mode control, primary side regulation, low component count, protection features and the ability to force a system into Eco mode operation.

The NCP1271D100R2G is one of the most power-efficient PMICs out there, combining high performance with low component count and high component/packaging density. It offers low switching and turn-on losses and consumes up to 0.3 watts of power in standby mode. The device has an internal startup sequence that sets the correct primary and secondary side power levels, as well as other protection features, for safe operation. In the case of overload or short-circuit the device reduces maximum output power and goes into a protection mode; recovering after the short circuit has been removed.

The applications of the NCP1271D100R2G are broad and include typical applications like portable power tools, electronic toys, PC peripheral, or industrial applications like smart meters, medical devices, pumps, or motor control systems, to name a few. It can also be used in high power applications such as AC/DC adapters, lighting systems, and home appliances.

The working principle of the NCP1271D100R2G is based on a fixed frequency current mode control topology integrated into a single monolithic IC. This IC includes all the active and passive components necessary to implement a flyback topology and to control the power transferred from the primary side to the secondary side. The IC contains the necessary circuitry for input current sensing, output voltage sensing, output over-current protection, short circuit protection and automatic restart.

The fixed frequency current mode control topology contains two main blocks: the primary control side and the output power section. The primary control side of the NCP1271D100R2G communicates with the output power section via an opto-isolator which reduces any chance of interference from the other components in the system. It also prevents any interference from the external environment that could cause unwanted oscillations.

The main control block of the NCP1271D100R2G is based on a voltage mode PWM (pulse width modulation) with fixed frequency in current mode control. The current limiting and slope compensation are obtained with a dedicated low pass filter and an internal comparator. The output power section consists of a power MOSFET, a voltage divider, a voltage sense circuit, a secondary winding and current sense circuitry.

The IC also includes an error amplifier, a temperature controlled oscillator, a soft start circuitry, as well as an Eco-mode detection and a low power detection circuit. The Eco mode detection circuit senses the output load and sets the operating point of the regulator according to the load. It provides the ability to reduce the device power consumption in Eco mode and provides a cost-effective solution to reduce no-load power when operating in Eco mode.

Overall, the NCP1271D100R2G is a highly advanced monolithic integrated circuit ideal for a wide range of applications. With its high power efficiency, low component count, and high component/packaging density, the NCP1271D100R2G is an ideal solution for any AC/DC applications.

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