NCP81109HMNTXG

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The NCP81109HMNTXG is a Monolithic, integrated controller designed for use with synchronous step-down power supplies. This controller combines a high level of integration reducing the number of components needed and a comprehensive protection scheme that ensures robust operation. The NCP81109HMNTXG has been designed to efficiently control modern synchronous step-down regulators based on both voltage mode and current mode architectures.

The NCP81109HMNTXG can be used as a DC/DC switching controller for applications such as point of load (POL) converters, notebook and desktop computer supplies, graphic card supplies, LCD panel supplies and low to intermediate power level DC/DC switch mode converters. Low output voltage ranges from 0.6 V to 5 V, and adjustable frequencies from 100 kHz to 2.2 MHz.

Application Field: The NCP81109HMNTXG\'s application field includes a wide range of products such as point of load (POL) converters, notebook and desktop computer power supplies, graphic card power supplies, LCD panel power supplies, and low to intermediate power level DC/DC switch mode converters.

Working Principle: The NCP81109HMNTXG uses a voltage mode and current mode synchronous rectification to control the output voltage of the power supply. A voltage error signal is generated between the output and the reference voltage. This error signal is then applied to the error amplifier which then compensates for variation in the output voltage by controlling the current in the synchronous rectifiers. This process is repeated in a feedback loop to maintain a steady output voltage.

The NCP81109HMNTXG provides a comprehensive protection scheme which ensures robust operation and smooth startup. It houses multiple protection features such as over-voltage, under-voltage and over-current protection, thermal shutdown and brown-out protection. This protection mechanism helps the power supply operate safely and helps protect the device from damage.

The NCP81109HMNTXG also features a low power sleep mode which can improve system-level efficiency by reducing power consumption to an absolute minimum. This allows the system to maintain very low power levels while in standby and eliminates wasted power.

The NCP81109HMNTXG is an excellent choice for synchronous step-down power supplies because of its high level of integration, robust protection scheme and low power sleep mode. It can be used in a variety of applications such as point of load (POL) converters, notebook and desktop computer power supplies, graphic card power supplies, LCD panel supplies and low to intermediate power level DC/DC switch mode converters.

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