LM2575T-15/NOPB

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LM2575T-15/NOPB Application Field and Working Principle

The LM2575T-15/NOPB voltage regulator is a step-down switching regulator device. It falls under the category of Power Management Integrated Circuits (PMIC), designed for DC DC switching regulator applications. This voltage regulator device is designed for a maximum input voltage of 35V and output voltage of 15V. It features very low quiescent current, low operating frequency and high efficiency, in addition to having excellent thermal performance.

Features of LM2575T-15/NOPB

• Input voltage range: 8V to 35V
• Maximum output current: 3A
• Output voltage range: 1.2V to 15V
• No load operating current: ≤100mA
• Load regulation: (1.2V to 15V) ≤0.2%
• Switch frequency: 37kHz to 500kHz
• Control mode: Pulse width modulation (PWM)

Application field

The LM2575T-15/NOPB voltage regulator is frequently used in distributed power systems and DC applications such as battery powered devices, automotive systems, power supplies for PC peripheral cards, DC motor drives and modem power supplies. Since it is designed for 5V and 12V battery-powered systems, it can also be easily used in distributed power systems that require a long output voltage range.

Working principle

The LM2575T-15/NOPB is an adjustable fixed-frequency pulse width modulation (PWM) step-down regulator. The device features a high peak current capability for driving large capacitive loads, and an internal current limit, thermal shutdown, and overvoltage protection (OVP) circuitry. Its high efficiency operation is achieved due to low dropout voltage and low quiescent current.

The transistor switch within the LM2575 is turned on, which draws current from the input source. This current is then filtered through an inductor and converted into an output voltage. As output voltage rises, the internal comparator detects the difference between the actual output voltage and the reference voltage. When this difference exceeds the error voltage, the transistor is automatically turned off and prevents further current flow. Thus, the output voltage is accurately maintained at the desired level.

For current limiting protection, the LM2575T-15/NOPB utilizes pulse-by-pulse current limiting, in which the current limit is triggered by monitoring the voltage across a sense resistor in the feedback loop. The current limit is initiated if the voltage across the resistor exceeds a specified threshold. This feature ensures that the output load current is maintained at a safe and steady level.

To protect the device from thermal runaway and overcurrent, the LM2575T-15/NOPB also incorporates a thermal shutdown and overvoltage protection (OVP) circuitry. In the case of thermal runaway, the device shuts down and the output will remain open until the temperature is reduced and the thermal protection latch is reset. If the output voltage exceeds the OVP limit, the output is disabled until the OVP limit is reduced.

Conclusion

The LM2575T-15/NOPB is a highly efficient and reliable DC/DC switching regulator device. The device features excellent thermal performance, low quiescent current, wide input voltage range and low operating frequency, making it ideal for distributed power systems. In addition, the current limiting protection, thermal shutdown, and overvoltage protection (OVP) circuitry provide enhanced safety. This device is widely used in the automotive industry, PC peripheral cards, DC motor drives, modem power supplies and other applications.

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