MAX5974AETE+

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The MAX5974AETE+ is a low-cost, high-performance AC/DC converter and offline switcher controller. It is designed to provide power to high-efficiency offline AC/DC switching regulator systems with simple transitions and low electromagnetic interference (EMI). It combines a low-voltage regulator and an integrated charge pump, which supports true-current sensing and fast-recovery overcurrent protection.

The MAX5974AETE+ integrates the power feedback control features of typical PWM-controlled flyback converters. This makes it well-suited for applications that require high light-load efficiency and high voltage stability. It also features a low-cost diffused-metal-film shunt as a current-sensing element.

To further increase system efficiency, the MAX5974AETE+ can work in open-loop operation, eliminating the need for a voltage reference circuit. It also supports high-efficiency operation in light-load conditions, allowing for a smaller output capacitor and high system performance.

The MAX5974AETE+ is intended for use in a variety of applications including parallel DC/DC converters and offline switching converters for consumer and industrial power supplies. Due to its wide input voltage range and high power density, it is well-suited for applications such as adapters, external power supplies, and LED lighting. It is also suitable for LED drivers, LED controllers, LED ballasts, and half-bridge converters.

The working principle of the MAX5974AETE+ controller is based on a fixed frequency Pulse-Width Modulation (PWM) method. This controller works by comparing the feedback voltage to an internal clock pulse train, which generates the duty cycle switching command. The internal clock frequency is typically set by an external resistor and/or capacitor, eliminating the need for an accurate external oscillator.

In addition, the MAX5974AETE+ features an internal error amplifier and low-power type gate drive circuits to provide quick and accurate current limit protection. This feature eliminates the need for an external current sensing element, thus simplifying the system design. The MAX5974AETE+ also offers an adjustable slope compensation current limit, which achieves fast output overcurrent shutdown response.

The MAX5974AETE+ also has a protection feature that guards against undervoltage, overvoltage, overcurrent, and short-circuit conditions to enhance system reliability. This protection circuit also prevents output oscillation due to a voltage step-down response.

Overall, the MAX5974AETE+ is an ideal AC/DC converter and offline switcher controller for applications requiring low-cost, high efficiency, and wide input-voltage range.

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