S-1155B34-U5T1U

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The S-1155B34-U5T1U is a three-terminal linear voltage regulator which can provide up to 3A of output current and operates with an input voltage range of 2.1V through 18V. The subtractive outputs can also be used to provide an adjustable output voltage, allowing the S-1155B34-U5T1U to be used in a variety of applications. This article will discuss the application field and working principles of the S-1155B34-U5T1U.

Application field

The S-1155B34-U5T1U serves as a general low-dropout (LDO) linear voltage regulator in consumer, industrial and automotive applications. It can provide power to devices that require lower voltage, such as I2C/SPI bus drivers and sensors. The subtractive outputs also makes this device suitable for applications wherein an adjustable output voltage is desired, such as adjustable DC/DC converters in automotive electronics. In addition, the S-1155B34-U5T1U offers features that make it suitable for load-side and load-dump protection, over-temperature protection, and short-circuit protection purposes.

Working Principle

The S-1155B34-U5T1U operates through a simplified voltage regulation scheme. This scheme consists of two stages: the error amplifier stage and the output stage.

The error amplifier stage is responsible for sensing the drop across the output and adjusting the output voltage to the desired level by varying the current in the pass transistor. The pass transistor includes a voltage divider that monitors the output voltage, a current mirror and an error amplifier. The error amplifier compares the output voltage to the reference voltage which sets the output voltage. Whenever the actual output voltage is different than the reference voltage, the error amplifier takes corrective actions by adjusting the gate voltage of the pass transistor, which in turn will adjust the output voltage.

The output stage is responsible for providing the current to the load. The output stage utilizes a Programmable Gate Drive (PGD) technology that improves the line and load transient response. Additionally, it includes the output pass transistor and the current limit circuit. For small load currents, the pass transistor provides constant current to the load. If the load current reaches the set current limit, the current limit circuit will take corrective actions to protect the device.

Overall, the S-1155B34-U5T1U is a versatile device that can be used for low voltage applications in a variety of areas. Its simple working principle makes it suitable for a wide range of applications.

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