SG7905K

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SG7905K Application Field and Working Principle

SG7905K is a type of voltage regulator from the PMIC - Voltage Regulators - Linear category. It is designed to help generate and maintain a smooth output voltage across varying electrical loads. This type of regulator is well-suited for use in a wide range of applications, such as in motor control circuits and AC/DC power supplies. Knowing how this device works allows designers and engineers to more accurately select and incorporate it into their electrical designs.

Overview of the SG7905K

The SG7905K is a linear voltage regulator in a TO-220 package. It features built-in thermal protection and fast transient response. It also has a wide input voltage range of 8.0V to 28V, output voltage range of 3.3V to 12V, and an output current of up to 2A. It has an operating temperature range of -40°C to +85°C, low temperature coefficient, and good line and load regulation.

The SG7905K is a monolithic integrated circuit. It contains all the necessary components for a voltage regulated system in one small chip, making it very efficient and cost-effective. It is especially suited for use in automotive and industrial applications where reliable and accurate power supply is required.

Pin Descriptions of the SG7905K

The SG7905K has 7 pins. Each of them carries a specific function.

• Pin 1 is the Input voltage (Vin). It is the voltage that needs to be regulated.
• Pin 2 is the GND pin. It is connected to ground.
• Pin 3 is the Output voltage (Vout). This is the regulated voltage.
• Pin 4 is the Enable/Disable pin. This is used to control the functioning of the SG7905K.
• Pin 5 and 6 are the Thermal Protection pins. These detect any excessive heat, and will shut down the device automatically if needed.
• Pin 7 is the Overload pin. This is the point at which the SG7905K will go into overload mode if the load current increases above the safe limits.

Working Principles of the SG7905K

The SG7905K works by regulating an input voltage by comparing it to a reference voltage. The output voltage is then adjusted based on the comparison mathematical calculation. It uses a shunt regulator topology to achieve its regulation capability.

The SG7905K operates by connecting two resistors between the input voltage (Vin) and the output voltage (Vout). A voltage divider is formed by these two resistors, and the output is monitored by the IC. It then adjusts the output voltage by controlling the current flow through the two resistors.

The regulation of the SG7905K is further improved by its Automatic Current Limiting (ACL) function. This function limits the output current and prevents any current-related damage to the device. The Thermal Protection pins also ensure that the SG7905K does not overheat and shut down during operation.

Applications of the SG7905K

The wide input and output voltage range of the SG7905K allow it to be used in a variety of applications. Some of the most common uses for this type of regulator include:

• Motor control circuits
• DC/DC converters
• AC/DC power supplies
• Medical equipment
• Industrial equipment
• Robotics
• Battery management systems

Conclusion

The SG7905K is an widely used and very efficient voltage regulator. It can be used to regulate a wide range of input voltages and output voltages. It has built-in features such as thermal protection and ACL, which help to ensure reliable performance. Due to its small size, low cost, and high efficiency, the SG7905K is an ideal choice for many applications, from motor control to battery management.

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