NCP1603D100R2

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NCP1603D100R2 is a power factor controller (PFC) specifically designed to improve the quality of current supplied by the source and reduce system power loss. It offers an economical mean to support today’s low system power topologies, highlighted by an extremely low switching current limit and quiescent current.

The main application fields of this part are lighting control, low standby power systems, and other industrial applications where high power factor and low power dissipation is required. This device can be used with both isolated & non-isolated single output offline converters.

Working Principle of NCP1603D100R2

This part uses a unique combination of direct control loops and frequency modulated average current control, a feature not found in other PFC controllers. In addition to the direct control loops, it also includes a current droop control loop. This feature continuously adapts the duty cycle of the converter to the amount of load, ensuring optimum system efficiency.

The direct control loops of this PFC controller have different objectives. One loop monitors and controls the output voltage of the system. Another monitors the input current and ensures it meets the requirements of the power factor correction. The third loop regulates the output current sense reference voltage. This voltage is used by the average current control loop to set the average output current.

A distributed loop architecture is employed by this device, which helps to achieve a fast settling time and superior EMI performance. The distributed loops have independent switching frequency and phase compensation, providing excellent load and line regulation.

The PFC controller uses a hysteretic peak current control to ensure minimum switch transitions by maintaining the switch current at a constant peak level. This helps to reduce energy losses. It also makes use of synchronous rectification for improved efficiency.

The NCP1603D100R2 is protected from overvoltage, undervoltage, over-current, short circuit, and thermal shutdown situations. It offers robust operation even in harsh environmental conditions.

In conclusion, the NCP1603D100R2 is a compact and cost-effective PFC controller, which is specifically designed to improve the power factor and reduce power loss in low power applications. The combination of direct control loops and frequency modulated average current control helps to achieve fast settling time, superior EMI performance, and improved system efficiency.

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