NCP1207DR2

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The NCP1207DR2 is an off-line, high voltage, Pulse-Width Modulation (PWM) Controller specifically designed for flyback converters operating at frequencies up to 150kHz. It provides the necessary features to design low component count and high efficiency isolated switched mode power supply systems with minimal external components.

Application Field

The NCP1207DR2 is suitable for small output power applications such as computer peripherals and consumer electronics, that require high efficiency, like AC/DC converters and switching adaptors. Particularly, it is well-suited for applications such as Switch Mode Power Supplies (SMPS), Switching Adaptors and Battery Chargers, Battery Chargers, Half-Brick Regulators, Isolated DC/DC Converters, High Power DC/DC Industrial Rectifiers, Offline Flyback Converters and Forward Converters.

Features

The main features of the NCP1207DR2 include the following: programmable sawtooth oscillator frequency up to 150kHz, adjustable integrated soft-start, adjustable peak current limit, free-wheel diode simulation, feedback circuitry with programmable slope compensation and programmable average current control. The over current protection prevents excessive stress on the components due to over-current fault conditions. Additionally, the NCP1207DR2 has a power SO-8 package and is flexible in terms of output power range.

Working Principle

The NCP1207DR2 works by using an internal PWM pulse-width modulation controller to control the output voltage. The PWM controller controls the voltage by switching the output voltage on using a Pulse-Width Modulation (PWM) pulse at a certain frequency and with a certain duty cycle. The duty cycle is determined by the internal current sensing circuitry, which senses the amount of current flowing through the load and adjusts the duty cycle as necessary to maintain the output voltage. The output voltage can also be adjusted manually by adjusting the peak current limit and the sawtooth oscillator frequency, or by programming the soft-start parameters.

The NCP1207DR2 also includes an integrated free-wheel diode simulation circuit, which simulates the function of a freewheel diode by clamping the current to the load during the off cycle, thus increasing the efficiency of the switch mode power supplies.

Conclusion

The NCP1207DR2 is a highly integrated and flexible off-line PWM controller with integrated soft-start, programmable current limit and free-wheel diode simulation. Its ability to operate at high switching frequencies and its power efficient design make it well-suited for AC/DC offline converters, switching adaptors and battery chargers. It is an ideal choice for space-constrained applications with tight cost targets, high efficiency and long product lifetime.

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