NCP1571D

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NCP1571D is a DC-DC switching controller, specially designed for power factor correction (PFC) circuit application, used to internally generate a PWM signal to drive an N-channel MOSFET switch used in boost, buck, buck-boost, and other topologies. It can also provide inrush current protection, adjustable soft-start, short circuit protection, thermal shutdown, under-voltage lockout protections, and other functions. The NCP1571D is a very cost-effective device and suitable for a wide range of applications.

Application Field

The NCP1571D can be used in a wide range of applications, from small to medium power platform applications. With its wide input-output voltage range and low quiescent current, this DC-DC converter can be used as an active power factor correction (PFC) regulator to achieve high power factor and improve system efficiency. Due to its input voltage range, the NCP1571D is suitable to replace discrete TL431 in many end-user applications, like LED lighting, LCD displays, industrial equipment, gaming equipment, renewable energy, and many other applications. Moreover, it is also an ideal controller for 25W~100W DC-DC converters.

Working Principle

The NCP1571D provides an internal PWM comparator, which creates a pulse width modulated (PWM) signal to drive an external N-channel MOSFET switch. It requires an external voltage divider to set up the desired operating frequency. The NCP1571D can support a wide range of input voltages and output voltages, as well as a wide range of power levels. It works with a fixed frequency, with a wide range of adjustment. It can be set up from 100kHz to 500kHz, according to user\'s requirements. Additionally, the NCP1571D has the ability to automatically select the pulse frequency in proportional to the input voltage, which increases the power factor and simplifies the design.

The NCP1571D includes an accurate current limit circuit with fold-back characteristic protection, as well as an under-voltage lockout (UVLO) circuit. It is a cost-effective solution to improve system performances and reduce time-to-market.

Conclusion

The NCP1571D is a cost-effective DC-DC switching controller, designed to soot the voltage range of the applications, with excellent performances and protections. It is suitable for a wide range of applications, from 15W to 100W. With its wide input-output voltage range, it can be used as an active power factor correction regulator and also as a direct replacement for traditional TL431 devices. It can be used in LED lighting, LCD displays, industrial equipment, and gaming equipment, as well as in many other applications.

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