L5973D

The L5973D is a monolithic step-down switching regulator designed for easy use in medium power applications. It is a medium voltage device with a maximum output current of 8A and a maximum voltage rating of 30V. It uses power MOSFETs for switching and provides high efficiency and wide range of operating frequencies. It is designed for applications from low to medium power, such as computer power supplies, internet of things (IoT) devices, automotive, and so on. This article looks at the application fields and working principle of the L5973D.Application Field of the L5973D
The L5973D is a monolithic switching regulator that is suitable for medium-power applications. Its main advantages are its high efficiency, wide operating frequency range, and low standby power. It can be used in devices such as:

• Computer power supplies,
• Industrial control systems,
• Networks,
• IoT (Internet of Things) devices,
• Automotive systems.

Working Principle of the L5973D
The L5973D is a voltage-mode, step-down switching regulator. It works by using power MOSFETs to switch a controlled voltage to the output. The MOSFETs are pulsed at a constant frequency to generate a regulated output voltage.The L5973D uses an internal error amplifier to control the voltage at its output. The feedback voltage is compared with the reference voltage, and the error amplifier adjusts the duty cycle of the MOSFETs to achieve the desired output voltage. The operating frequency of the L5973D is adjustable from 200kHz to 1MHz, allowing designers to optimize efficiency and performance.The L5973D also contains several protection features to guard against over-current, over-voltage, under-voltage, and thermal shutdown conditions. It features internal soft-start and external synchronization capabilities, as well as an adjustable current limit.Conclusion
The L5973D from STMicroelectronics is a monolithic, step-down switching regulator designed for medium-power applications. It uses power MOSFETs for switching and offers high efficiency, wide operating frequency range, and several protective features. The L5973D can be used in many applications, including computer power supplies, networks, industrial control systems, IoT devices, and automotive systems.