NCP1937B3DR2G

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Power Factor Correction (PFC) is an electrical technology utilized primarily in power systems design as a means of improving power quality. It applies to voltage and current waveform phase angle control to correct the degree of phase shifting and phase difference between power supply lines, to reduce the input power factor, to achieve the purpose of power saving and reducing system losses, and meet the requirements of power grid stability and power quality.
NCP1937B3DR2G is a PFC controller IC produced by ON Semiconductor, a global semiconductor supplier. This chip is a controller specifically designed for applications requiring fast transient response and high circuit performance accuracy. It provides an active input current limit, as well as a programmable undervoltage lockout, frequency jittering and minimum duty cycle setting options. The NCP1937B3DR2G is a highly integrated PFC controller, providing a cost-effective solution for offline AC-DC power supplies. It also supports fast recovery diodes, and provides 1.4V to 1.5V fixed voltage with integrated low drop-out (LDO) regulators to drive the PFC gate driver and error amplifiers.

The NCP1937B3DR2G is suitable for several different application fields, such as medical equipment, personal computers, servers, lighting equipment and white goods. This chip offers many features suitable for its use in these appliances, such as wide-input voltage range, low power dissipation and low startup current, which helps to maximize the efficiency of the power system. In addition, it has an integrated overvoltage protection (OVP) and undervoltage lockout (UVLO) to guarantee that the output voltage stays within a predefined range. In addition, the internal soft-start and auto-restart circuit help to reduce the stress on the other components of the system while eliminating the need for external circuitry.

The working principle of NCP1937B3DR2G is quite simple. When AC input voltage is applied, the internal overvoltage protection circuit removes the voltage to protect downstream devices and the output voltage of the chip is maintained between 1.4V to 1.5V. When the AC input voltage is within the pre-programed range, the internal comparator will detect the AC voltage and turn on the MOSFET internally. The internal error amplifier then calculates the voltage and current losses and feeds the corresponding signal to the gate drive circuit. The signal is then amplified to drive the gate of the external power MOSFET switch continuously. This helps to eliminate unnecessary power losses and maintain the input and output voltage at a certain level according to the needs of your system.

The NCP1937B3DR2G is an ideal solution for various PFC applications. Its features, such as wide input voltage range, low power dissipation and low start-up current, make it ideal for medical appliance, lighting equipment, personal computers and servers applications. Additionally, its integrated OVP, UVLO and built-in soft-start and auto-restart circuit enable the chip to provide reliable and efficient power supply with minimum power losses. All in all, the NCP1937B3DR2G is the ideal choice for a wide range of PFC systems.

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