L4931ABZ80-AP

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The L4931ABZ80-AP linear voltage regulator is an integrated circuit (IC) compatible with various process nodes and resolutions. It has several features which make it ideal for a variety of applications, including those in automotive, consumer electronics, industrial applications and more. The device is composed of two main blocks: an input-interfacing preconditioner which can be operated in three ways—normal, low distort and unity gain,—and two independently controlled power MosFETs for switching output stage. In this article, the functionality of the L4931ABZ80-AP including its application fields and working principle will be explained.

Application Fields

The product operates as a linear-based power supply suitable for use in a range of applications, such as automotive, consumer electronics, and industrial systems. In automotive applications, the device will operate as a low noise, low voltage rating voltage regulator over a wide temperature range. Its ability to reduce temperature sensitivity of the output voltage will make it suitable for use in audio amplifier, heating, ventilation and air conditioning systems. In the consumer electronics market, the product is suitable for use in smartphones, wearables and other portable electronic devices. The device supports both step-up and step-up/down control and can deliver high efficiency output voltage conversion between two or more voltages. Its overcurrent and overtemperature protection as well as its wide input voltage range of 4.3V to 24V make it suitable for use in industrial systems such as motor drives, power supplies and switches.

Working Principle

The L4931ABZ80-AP consists of two main blocks: an input-interfacing preconditioner and two independently controlled power MosFETs for switching output stage. The input-interfacing preconditioning block allows a microcontroller to control the voltage and current levels of the output stage. With the help of the on-chip register, the user can pre-configure the settings, such as parameter and control (stroke speed, soft start time, enable/disneed and so on). The MosFETs in the switching output stage provides fast transient responses and high-efficiency voltage conversion.

When a low voltage is detected at the output, the L4931ABZ80-AP will initiate a series of actions that adjust the output voltage level to the configured one. First, the voltage comparator will detect the sudden change and activate the pulse-width modulation (PWM) and control loop. The PWM will control the Gate-Source Voltage (VGS) continuously, adjusting the voltage difference. When the voltage difference reaches the wanted level, the voltage is effectively regulated and the system will stay stable.

The controllable output voltage range is from 0.7V to the input voltage range. Short overvoltage or overcurrent protection is provided for improved design robustness. The device supports two different modes according to the application demand. The pulse frequency control mode can reduce the conduction loss and the current mode control mode can reduce the switching noise. Both modes can provide fast transient responses and accuracy of voltage conversion.

The L4931ABZ80-AP linear voltage regulator is a versatile product suitable for a variety of automotive, consumer electronics and industrial applications. With its advanced features, such as a low voltage rating, pulse frequency control mode and current sensing output voltage conversion can be achieved with high efficiency and accuracy. The device is well suited to a range of applications and will provide the necessary power stability and regulation needed for these systems.

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