NCP1207PG

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The NCP1207PG application field is in PMIC - AC/DC converters, Offline Switchers. It is an integrated power IC for fixed-frequency current mode PWM controller applications. It is an application specific integrated circuit (ASIC) that gives lower system cost in comparison with discrete designs. It is designed for synchronous buck regulator applications that require low component count and minimal board space.

The NCP1207PG is optimized for a synchronous buck regulator and is intended for primary side control applications with low side MOSFET switching. It is suitable for any type of offline converter or adaptor applications. It supports current mode control and PWM operation up to 300 kHz. The NCP1207PG also provides full protection features such as over current protection, short circuit protection, over voltage protectionand thermal shutdown. It is available in a 20-pin PDIP package.

The NCP1207PG working principle is based on a fixed-frequency current-mode PWM controller. It consists of a voltage reference, an error amplifier, a ramp generator, a sense amplifier and an over current protection (OCP) circuit. The voltage reference produces an internal reference voltage, which sets the control loop regulation threshold. The error amplifier senses the output voltage of the power supply and compares it to the reference voltage. When the power supply is out of regulation, the error amplifier produces an error signal, which is amplified and used to drive the oscillator. The oscillator then outputs a triangle wave, which is compared to the error signal. This comparison results in either a zero (off) or a pulse-width-modulated (PWM) signal, which drives the switch transistor. As a result, the output voltage of the power supply is regulated.

The current-mode control technique used in NCP1207PG helps to reduce output voltage ripple. The OCP circuit ensures that the maximum current is not exceeded in the power supply. An external resistor is used to limit the current. The maximum duty cycle is set by software. The PWM frequency can be programmed in a range going from 50KHz up to 300KHz.

The NCP1207PG is an integrated circuit for fixed frequency current mode PWM controller applications for AC/DC converters and Offline Switchers. Its low component count and minimal board space requirements reduce system cost in comparison with discrete designs. Its over current protection and temperature shutdown features ensure an efficient and safe operating environment, while its adjustable current limit provides flexibility to the user. Its adjustable frequency range and high speed PWM operation make it ideal for a variety of offline power supply applications.

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