LM5642XMHX

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LM5642XMHX application field and working principle

The LM5642XMHX is a voltage/current regulator and DC/DC controller that supports advanced solutions for many applications. It is designed to provide integrated and high-performance features that boost efficiency and reduce system power loss.

Applications

The LM5642XMHX is particularly well-suited for applications in regulated current and voltage supplies where high efficiency, low voltage ripple and excellent transient characteristics are required.

• Optimized for multiphase and single phase buck regulators.
• Power factor correction converters.
• Battery charging applications.
• Closed loop DC/DC converters.
• Cascaded buck regulator architectures.

Working Principle

The LM5642XMHX\'s main job is correcting voltage fluctuations or ripple, which is caused by the power supply switching frequencies or load current changes on a line or bus. An internal error amplifier constantly monitors the input and output voltages, and adjusts the average output voltage of the regulator to match the set point. When the set point is reached, the error amplifier stops the switching cycle.

The AC ripple is generated when the regulator is operated in the Pulse Width Modulation (PWM) regulator mode. This technique uses two switching transistors that instead of operating in steady state generate pulses at a desired frequency maintaining the output voltage closer to the set point.

The duty cycle of the pulses is used to maintain the output voltage at the set point. The pulses rise and fall according to the transitions of the feedback signal and the regulating circuits. As the duty cycle is adjusted, the gate drive signals cause the regulator\'s transistors to turn on and off, in order to modulate the output voltage.

The LM5642XMHX is also equipped with an internal error amplifier and integrated low-side and high-side drivers that make it easier to implement a wide range of PWM switching regulator functions.

Conclusion

The LM5642XMHX is a versatile voltage/current regulator and DC/DC controller that offers advanced features to improve system power efficiency. It is suitable for applications in regulated current and voltage supplies, power factor correction converters, and battery charging applications, among others. The LM5642XMHX features an internal error amplifier, integrated low-side and high-side drivers, and also a PWM switching regulator mode that is used to maintain a desired output voltage.

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