NCP1255DD65R2G

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NCP1255DD65R2G is an integrated, low-cost and high-efficiency primary-side control for offline switching power supplies. It is designed for AC/DC converters and offline switchers whose current ratings range from 1A to 65A. This device features a user-selectable constant-current (CC) or constant-voltage (CV) operation and limits current peak in CV mode to reduce losses and keep the standby power low. It also has a unique fast load-transient response, enabling higher efficiency and better regulation even at light-load, as well as very high immunity to line-transient and conducted spurious noise.

NCP1255DD65R2G is designed for ease of use, a wide input voltage range, low standby power consumption and ultra-low operating frequencies. It provides an accurate amplitude, high-precision leading edge blanking (LEB) base line detection and heavy-duty protection features which are essential in today\'s offline switchers and AC/DC converters.

The device includes primary-side and secondary-side parameters monitoring to enable secondary-side safety and protection features. The secondary-side fault detection can be used to disable the converter after a certain number of switching cycles. A dedicated Sleep-mode control pin reduces the standby power in some applications.

The main application field of this device is AC/DC converters and offline switchers. NCP1255DD65R2G design provides several modes of operation, based on the user requirements.

• CC & CV Mode: This mode allows the user to adjust the constant-current or constant-voltage operation depending on the application.
• Light Load & Standby Mode: The design of NCP1255DD65R2G enables a quick and precise response to load transients, even at light-load or during standby mode.
• Dynamic Load Transient Capability: This mode is especially useful when the load changes quickly and the converter requires a quick response to regulate the output voltage.
• Fault Detection & Response: NCP1255DD65R2G features several detection parameters and can respond quickly to any fault conditions.
• Sleep Mode Control: This is an added feature that allows the converter to save power in standby mode.

In terms of its working principle, NCP1255DD65R2G is a PWM regulator based on a pulse-width modulation (PWM) topology. This method involves the creation of a square wave whose duty cycle is proportional to the error signal. The physical implementation of this simple technique is as follows.

An error signal comparing the regulator\'s output voltage to the reference input is generated. This signal is then amplified and used as the basis of the Pulse-Width Modulation (PWM). The output of the PWM then produces a square wave that is compared with a triangle wave. The duty cycle of the square wave is proportional to the error signal. This duty cycle is then used to create a varying output voltage. A sense resistor is usually used to sense the output of the power supply and compare it with a user-defined regulation level. The overall efficiency of the system is highest at a certain duty cycle thus integrating NCP1255DD65R2G into the design will increase it further.

In summary, NCP1255DD65R2G is an integrated, low-cost and high-efficiency primary-side control for offline switching power supplies. It provides ease of use, a wide input voltage range, low standby power consumption and accurate amplitude, high-precision load-transient response. It is mainly used in AC/DC converters and offline switchers. Its working principle is based on Pulse-Width Modulation (PWM) and it delivers very high efficiency and better regulation even at light-load.

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