NCP1256ASN65T1G

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The NCP1256ASN65T1G is an offline switcher PWM controller integrated circuit from ON Semiconductor. It is a comprehensive, highly integrated, power management solution for any off-line AC to DC converter. The NCP1256ASN65T1G is ideally suited for cost-sensitive applications such as Smart Appliances, LED lighting and adapters for consumer, industrial and automotive off-line applications.

The NCP1256ASN65T1G is a single-channel, high-voltage PWM IC designed to meet the requirements of off-line AC-DC power converters. It integrates many of the essential functions required in the design of an efficient offline power supply, including a high-voltage flyback controller, overcurrent protection, open-loop current mode control, operational amplifier and low standby power consumption. The NCP1256ASN65T1G also offers protection features such as overvoltage, overcurrent, primary current foldback, over temperature shutdown and brown-in/brown-out protection. The device provides a precision enable input that simplifies operation across a wide range of AC input voltages.

The NCP1256ASN65T1G is suitable for flyback topology systems with up to 6-watt output power. It incorporates both a 725V tolerant VCC pin and a 95V PFC pin for improved system efficiency. In addition, it has PFC auto-start and can regulate output voltage without an opto-coupler. The integrated current mode control loop allows for fast and constant switching frequency despite wide load and line variations. The output overvoltage protection feature allows the NCP1256ASN65T1G to continuously monitor and adjust the output voltage to desired levels. The protection circuitry includes both current foldback and over-voltage protection against short-circuits. The NCP1256ASN65T1G also features a power saving mode for increased efficiency at light loads and high ripple reduction for steady output current. Additionally, it has excellent regulation characteristics for small output ripple and load transient response.

The NCP1256ASN65T1G is an excellent choice for applications that require high efficiency power conversion from the AC line to DC. It is well suited for cost-sensitive applications such asSmart Appliances, LED lighting and DC adapters thanks to its low standby power consumption and integrated protection features. It also simplifies the design and operation of an AC to DC converter due to its integrated current mode control loop, overvoltage and overcurrent protection, and precision enable input.

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