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L6711TR Application Field and Working Principle

The L6711TR is a DC-DC switching controller specifically designed for automotive applications. It is a highly integrated device allowing the designer to manage advanced safety mechanisms and other features in a very economical space and cost. This makes the L6711TR an ideal choice for a variety of automotive system applications, such as body electronics and powertrain applications.

Features of the L6711TR

The L6711TR integrates a number of features to provide a robust and cost effective solution for automotive applications, these include:

• Input current and voltage sensing
• Autonomous voltage control
• Precise control over the output voltage and current overflow limits
• Maximum power point control
• Load dump protection
• Over-voltage and short circuit protection
• Latch-off feature in case of over-temperature
• Adaptive frequency control

Application Field

The L6711TR is suitable for applications where high efficiency, minimum stand-by power consent and system cost are essential. Suitable applications include:

• DC/DC converters for automotive systems
• Battery chargers
• Power management modules
• DC/DC switch mode chargers
• DC/DC buck converters
• DC/DC boost converters
• DC/DC flyback converters

Working Principle

The L6711TR uses an adaptive on-time control technique to regulate the output voltage in a closed-loop. The device integrates a voltage reference of ±0.5%, a current sensing comparator, a slope compensation generator, an adaptive on-time controller and a driver stage. The current sensing comparator senses the input current that flows out to the load and compares it to the provided reference voltage. It then generates a voltage proportional to the difference between the sensed current and the reference. As the sensed current increases, this voltage also increases. The current sensing comparator then communicates this voltage to the adaptive on time controller which is responsible for adjusting the duty cycle in order to maintain the output voltage within a desired range.

The on time controller receives the current sensing signal from the error amplifier and uses it to adjust the width of the output pulse. By adjusting this output pulse width, the current flowing through the load is effectively regulated, thus resulting in a regulated output voltage. Additionally, the L6711TR integrates an overload detection feature which helps to protect the system by latching off the output when it detects an over current condition.

Conclusion

The L6711TR is a high-performance DC/DC switching controller suitable for a variety of automotive system applications. It integrates a number of features to provide robust and cost effective solutions. The device uses an adaptive on-time control technique to regulate the output voltage in a closed-loop, protecting the system in cases of overload or short-circuit.

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