NCP1239KD65R2G

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NCP1239KD65R2G Application Field and Working Principle

The NCP1239KD65R2G by On Semiconductor is a current mode high voltage flyback controller IC intended for use in medium power switching supplies (power levels from 10 W to approximately 250 W). It is part of PMIC (Power Management IC) family and belong to AC DC Converters and Offline Switchers category.

NCP1239KD65R2G is an advanced monolithic control circuit that achieves high reliability and simple power supply design with few components. It can be also used in pulse by pulse current limit. The device features integrated high voltage switch, which works over current protection, cycle by cycle current limiter and thermal shutdown protection. It is suitable for many different off-line applications such as adapters, appliances and open frame supplies.

The device’s operating principle is based on the classic flyback topology with auxiliary winding and isolated secondary-side rectification. The primary-side PWM controller performs the regulation of the switching cycle by controlling the output voltage through a secondary-side optocoupler or other feedback mechanism. By using the few external components, the NCP1239KD65R2G can be operated with several different configurations including open loop flyback, regulator flyback and forward converter autonomous systems.

The device features several externally-programmable operating modes including burst mode, skip cycle mode, frequency shift keying, over temperature protection, soft start, and over voltage protection. Low standby power consumption and quick transient response are also important features of this device. It also has a built-in low-side gate driver for driving MOSFETs, making it a straightforward solution for power supply design.

NCP1239KD65R2G is available in a small SOP-6L package, which offers a compact design, power savings and high reliability for small- to medium-power applications. Its wide range of operating temperature (-25°C to 100°C), low thermal resistance and current monitoring (programmable from 28 mA to 150 mA) complement the wide range of benefits the device can offer.

In summary, NCP1239KD65R2G is a highly reliable, high voltage flyback controller IC suitable for medium power switching supplies with power levels from 10 W to 250 W. It is part of AC/DC converters and offline switchers PMIC family and offers high flexibility with adjustable voltage, frequency and current regulation in a wide range of temperatures.

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