L6717A

L6717A application field and working principle

L6717A is a high voltage integrated voltage regulator specifically designed for automotive applications. It is classified as a special purpose power management integrated circuit (PMIC). It has a maximum working voltage of up to 40V and output currents up to 1.5A.

The L6717A is capable of providing a very precise output voltage accuracy even with large input voltage fluctuations. It is used in automotive applications such as powertrain, engine control systems, lighting, and infotainment systems, etc. By combining high performance with automotive grade robustness, the L6717A makes it ideal for such applications.

Working principle

The L6717A integrates several digital and analog components and contains a voltage detection, regulation and over-voltage protection system. The device is designed to maintain an output voltage, while regulating it in response to changed load conditions and input voltage changes.

The device regulates an output voltage via a comparison between the output voltage and an internal reference voltage. An error amplifier creates a comparison between the sensed output voltage and an internal reference voltage. If the sensed voltage is higher than the reference voltage, the error amplifier reduces the duty cycle of the Output MOSFET. This reduces the output voltage until it is equal to the reference voltage. Conversely, if the sensed voltage is lower than the reference voltage, the error amplifier increases the duty cycle of the Output MOSFET. This increases the output voltage until it is equal to the internal reference voltage.

The device is also equipped with an over-voltage protection (OVP) system to limit the voltage in the event of abnormal situations. The OVP system is based on a current sensing circuit that limits the output voltage in the event of an over-voltage situation. The current sensing circuit will shut off the MOSFET when the output voltage is higher than the predetermined OVP threshold.

Conclusion

The L6717A is a special purpose PMIC designed specifically for automotive applications. It has a high voltage range and a high current output capability and provides a very precise output voltage accuracy. It regulates an output voltage via a comparison between the output voltage and an internal reference voltage and is equipped with an OVP system to limit the voltage in the event of abnormal situations. By combining high performance with automotive grade robustness, the L6717A makes it ideal for such applications.