NCP1937B1DR2G Integrated Circuits (ICs)

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Power Factor Correction (PFC) is a power management technology that helps maintain the desired power factor of a system by regulating the line voltage and current parameters. PFC enables a system to draw more current without exceeding the rating of the thermal and voltage ratings of the system components. PFC makes use of efficient semiconductor topologies to maintain the required power factor across the input voltage range.

NCP1937B1DR2G is a highly integrated High Efficiency (HE) PFC+Buck Controller device providing complete PFC and buck stage for power system applications up to 20V, 200W. This Controller provides precise control and high accuracy over the entire load range. NCP1937B1DR2G is capable of achieving a high power factor (PF) including light load efficiency and harmonic distortion to meet EN61000-3-2 and EN61000-3-3 standards while achieving high standby efficiency, robust safety features and high EMI performance.

The NCP1937B1DR2G PFC+Buck Controller is specifically designed for telecom and server power supply applications that require precise voltage and current control, high power efficiency and tight regulation over the entire load range. The device offers a wide range of features designed to improve system performance, reduce component costs and reduce system size.

The working principle of NCP1937B1DR2G is relatively simple. The device consists of a PFC stage, a Buck stage and a control block. The device operates in closed loop control based on input voltage, output voltage and current feedback signals. The PFC stage operates in Critical Conduction Mode (CCM) to provide high power factor performance and low switching loss. The Buck stage is composed of an MOSFET, current sensing resistor and an internal PWM controller. The PWM voltage is compared to the reference voltage to generate an error signal. The error signal is then used to generate the PWM duty cycle. The Control Block provides the device with power-good signal, current-limit protection and accuracy compensation for both voltage and current loop.

In summary, the NCP1937B1DR2G PFC+Buck Controller provides a highly integrated solution with precise voltage and current control, high power efficiency, tight regulation over the entire load range and robust safety features, making it an excellent choice for a wide range of telecom and server power supply applications. The device is capable of achieving a high PF value and EMI performance, while maintaining the desired safety level according to various standards.

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