UC3525AQTR

UC3525AQTR application field and working principle

UC3525AQTR is a type of DC-DC switching controller designed by Texas Instruments (TI). It is a member of TI’s line of PMIC voltage regulators and DC-DC switching controllers. It is designed for controlling output voltages with low or high power density or enabling power optimization with inrush current or low power consumption.

Application

UC3525AQTR is a controller tailored to applications where power supply optimization is important in providing the most cost-efficient solution. It is used in many occasions such as telecommunications, industrial control, lighting control, motor control and portable electronics. Designed for minimal power consumption, it is used for controlling power supply design in small spaces.

The compact design of UC3525AQTR makes it an ideal choice for applications where minimal board size is an important factor. It supports the lowest power consumption and provides reliable power source monitoring and system reset.

Features

• Wide input voltage range: 4.5V to 40V
• Low quiescent current
• Ability to start-up into pre-bias conditions
• Integrated under-voltage protection and overload protection
• Programmable ramp compensation and slew-rate control
• Compact 4.9s × 3.8s package
• Protection against short-circuit, excess current or reverse voltage
• Grade 2 temperature qualification
• 3-phase full and half tubular motors supported

Working Principle

UC3525AQTR is a monolithic integrated circuit, comprises two stage control loops that together achieve tight output voltage regulation without requiring any external components. An internal oscillator generates a Variable clocking to establish a stator frequency that is lower than the input frequency, enabling each semiconductor switch to handle the high power spikes in the power supply system.

UC3525AQTR has an internal reference voltage that establishes the output voltage. The voltage difference between the input voltage and the reference voltage is compared and when a difference is detected, the oscillator is adjusted to create an output voltage that matches the reference voltage. The output voltage can be adjusted by changing the external capacitor values.

In addition to maintaining the output voltage, UC3525AQTR also provides protection against short-circuit, excess current, and reverse voltage. The device features built-in over-current protection which will shut down the output if too much current is drawn from the output. The short circuit and overload protection circuits can be configured for multiple thresholds for better protection and stability.

Conclusion

UC3525AQTR is a reliable and efficient DC-DC switching controller. It is perfectly tailored for power supply design in small spaces. Its wide input voltage range and integrated protection circuits makes it suitable for applications where reliability and safety are necessary. The compact package and the adjustable output voltage makes it an ideal choice for many industrial and consumer applications.