L6728

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The L6728 is a one-of-a-kind integrated switching controller from STMicroelectronics, and it is designed to be used in DC-DC regulated power supply systems. The device consists of an internal high voltage Power Control P-FET connected to an input terminal of a Pulse Width Modulator (PWM), which is integrated with a low voltage control signal P-FET. The device supports a wide input voltage range and is fitted with an adjustable output voltage. It is suited for applications where stability, efficiency and robustness are vital.

Application Field & Working Principle

The L6728’s application fields are mainly motor control and DC/DC converters. Its main function is to provide a direct current (DC) voltage to ensure a constant power output. Its different operating modes and a wide input voltage range provide flexibility and great efficiency that is suitable for various applications in motor control, such as mobile robots, DC motor and motor drives.

The working principle of this device is based on the PWM, or pulse width modulation technique, in which the input voltage is chopped into a series of digital pulses with a specific duty cycle in order to obtain a desired average output voltage. This technique is also known as pulse duration modulation (PDM) or pulse frequency modulation (PFM). The average voltage is determined by the duty cycle of the pulses, which is controlled by the power control P-FET in the L6728.

In order to obtain a desired output voltage, the L6728 is equipped with a low voltage control signal P-FET. This P-FET is operated depending on the current input voltage, output voltage and temperature readings taken from the device. The output voltage is then regulated according to the given set of conditions. In summary, the main components of the L6728 are the PWM, the power control P-FET and the low voltage control signal P-FET.

Features and Benefits

The L6728 features an adjustable output voltage range from 0.8V to 20V and is rated for power up to 600W. The device also has an adjustable operating frequency up to 1MHz, an efficiency of 97%, an input voltage of up to 30V and an output voltage ripple of 6mV. Moreover, the device offers a smart Short-Circuit, Thermal or Over-Voltage Protection meaning it can provide maximum safety and reliability. The device also requires very low external components and can be controlled via an SPI, I2C or single-wire interface.

The main benefits of the device are its very low noise level, high efficiency, low external components and good protection against overload, over temperature, short circuit and overload conditions. Its high efficiency helps to minimize power loss and reduce energy cost, while its low noise operation allows for quieter operation. The wide input and output range of the device also makes it suitable for a wide range of applications. The low external components required also helps to minimize circuit size and cost.

Conclusion

The L6728 from STMicroelectronics is a high performance and reliable DC-DC switching controller which is suited for applications such as motor control and DC/DC converters. It is equipped with an adjustable output voltage range, high efficiency and low noise operation with adjustable operating frequencies up to 1MHz. The device’s protection features help to ensure maximum safety and reliability, while its low external components help to minimize circuit size and cost. Therefore, the L6728 is the ideal choice for applications where stability, efficiency and robustness are vital.

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