L4972AD

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L4972AD Application Field and Working Principle

The L4972AD is a DC-DC switching regulator designed for medium power applications. Developed by ST Microelectronics, the L4972AD is an efficient and compact way to provide a stable and reliable power supply. It is a step-down switcher that takes an input voltage of up to 36V and steps down the voltage to the desired output voltage level. The output voltage is adjustable between 1.2V and 36V and the device can deliver up to 3A of output currents. The L4972AD is suitable for applications requiring low and medium power.

Features

• Wide input voltage range of 4.5V to 36V
• Output voltage adjustable from 1.2V to 36V
• High-current output up to 3A
• Thermal protection
• Overvoltage protection
• Overcurrent protection
• Excellent line and load regulations
• Extended temperature range

Applications

• Automotive
• Portable devices
• Digital video
• Industrial and consumer applications
• DC/DC converters and power supplies

Working Principle

The L4972AD is a synchronous step-down DC-DC converter that uses pulse width modulation (PWM) to control an N-channel power MOSFET as the switch element. This power MOSFET is used in a constant on-time configuration meaning it is always on for a predetermined amount of time when the device is operating – regardless of the output voltage. This is known as “constant on-time operation”. The output voltage is then determined by the overall duty cycle of the pulses.

For the feedback circuit, the L4972AD uses a voltage mode PWM control to maintain a stable output voltage. The feedback error signal is generated using an external resistive divider and is sent to the internal error amplifier. The error amplifier corrects the oscillator pulse width and maintains a predetermined output voltage. The L4972AD also incorporates current-limiting circuits to protect the device from excessive loads.

The L4972AD also contains input voltage protection circuitry that senses excessive input voltage and automatically shuts down the device. In addition, it features thermal protection to shut down the device in the event of over-temperature. All of these features allow the L4972AD to operate in extreme temperatures, making it suitable for automotive and industrial applications.

Conclusion

The L4972AD is a step-down DC-DC switching regulator from ST Microelectronics with a very wide input voltage range of 4.5V to 36V and high-current output up to 3A. It is suitable for automotive, consumer and industrial applications and offers overvoltage, overcurrent and thermal protection. The device uses PWM control to maintain a stable output voltage and features a current-limiting circuit to protect it from excessive loads. The L4972AD is an extremely efficient and reliable way to provide a stable and reliable power supply.

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