NCP1399AGDR2G

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The NCP1399AGDR2G is a high efficiency current mode controller and is an important component of the PMIC AC DC converters. It is applicable for offline switching power supply, direct off-line battery charger, high efficiency AC DC and DC DC converters and resonant mode applications. It has many features such as soft switching and low power dissipation. The NCP1399AGDR2G enables superior performance and improved efficiency by providing a very low duty cycle PWM control at no load, allowing for higher power output at any load.

The NCP1399AGDR2G also offers a complete protection suite for the power conversion, such as over and under current protection, under voltage lockout, over voltage protection and short circuit protection. The accurate control and protection features results in robust, yet cost effective designs.

In terms of the working principle, the NCP1399AGDR2G controller uses pulse width modulation (PWM) to precisely control the power delivered to a load. The basic switching cycle includes a sawtooth ramp and a matching PWM signal to determine the amount of power required. The sawtooth ramp is a voltage waveform that repeats, with the voltage increasing and decreasing in a stair-like shape. The sawtooth ramp determines the overall frequency, while the duty cycle determines the ratio of peak voltage to average voltage.

The PWM signal is determined by the voltage on the sawtooth ramp. At the point the ramp reaches each peak, a comparison is made between the sawtooth voltage and an external voltage reference. The external reference voltage is provided either by an analog-to-digital converter connected to the system power supply or by a digital logic circuit. If the sawtooth voltage is higher than the reference voltage, the PWM signal is HIGH and the load transistor is enabled. If the sawtooth voltage is lower than the reference voltage, the PWM signal is LOW and the load transistor is disabled. By modulating the PWM signal with varying duty cycles, the actual output voltage and current are controlled.

The NCP1399AGDR2G controller has many features that features that optimize its performance and operation, as well as advanced protection features for reliable protection and operation. One of the features is current mode control with peak current mode control, which allows for accurate and stable control of the load even at high input or output ripple current or high Duty Cycle. This feature also helps to reduce the power dissipation in the controller. Another feature is PFC support, which provides high-efficiency performance to the system by accounting for input power factor correction.

In addition, the NCP1399AGDR2G has burst mode operation, which is a power saving mode in which the output voltage is reduced when the load is light. This feature reduces power consumption and improves system efficiency. Another feature is an on-chip temperature sensor, which allows for monitoring and control of the power supply temperature. The on-chip temperature sensor also helps to maintain safe operating temperature conditions.

The NCP1399AGDR2G is an important component for PMIC AC DC converters, offline switchers, and other power supply related applications. Its high efficiency current mode control, accurate control and protection, PFC support, and advanced protection features are added benefits that can offer significant cost savings and increased performance. With its wide variety of feature, the NCP1399AGDR2G is the ideal solution for any AC DC power supply design.

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