LM2576T-12/NOPB

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The LM2576T-12/NOPB is a voltage regulator device from Texas Instruments that is part of their family of PMICs. It is a DC-DC switching regulator, specifically designed for applications requiring high-efficiency, low-noise, and low-dropout performance. This device is ideal for delivering regulated power to various circuit elements such as FPGAs, CPUs, and DSPs.

The LM2576T-12/NOPB has a wide input voltage range from 3V to 40V and can provide an output from 0.8V to 12V with a maximum output current of 1.5A. It operates with a constant switching frequency of 150kHz. In order to reduce EMI (Electromagnetic Interference), the device employs On-Time Control and Slope Compensation techniques. The parts can be configured in either a monolithic buck or boost converter configuration depending upon the application. The onboard FT pin allows the user to program the feedback voltage ratio.

The LM2576T-12/NOPB employs a current mode control scheme, which provides comprehensive protection against short circuit, overload, and thermal overload. It features a wide operating temperature range of -40C to +125C, low quiescent current, and fast transient response that enables switching frequencies up to 1MHz. With an external softstart capacitor, the part is able to maintain the output voltage within 1% from cold start up to steady-state.

The LM2576T-12/NOPB is packed in an industry-standard TSOT-23-6 package that helps to save board area and reduce device costs. It is an excellent choice for applications requiring not only high efficiency but also low output ripple noise and high power density.

Working Principle

The LM2576T-12/NOPB features a efficient current mode control topology that maintains a constant switching frequency and regulates the output voltage with precision. It incorporates an internal high speed oscillator comparator, high power drive and a 0.8V regualtor. In order to generate the regulated output voltage, the device switches the power transistor between the two levels determined by the output voltage.

The device is equipped with a PWM comparator that compares the voltage at the output of an internal error amplifier to the voltage at the reference voltage. If the error amplifier’s output voltage is higher than the reference voltage, a pulse width modulation (PWM) signal is generated and the power switching transistor is switched off. If the error amplifier’s output voltage is lower than the reference voltage, a PWM signal is generated and the power switching transistor is switched on. This pulse width modulation (PWM) signal is used to regulate the output voltage to the desired level.

The LM2576T-12/NOPB uses a bidirectional current sensing scheme to detect the output current. This sensing scheme allows the device to detect the output current and control the on-time of the power switching transistor to ensure that the output current does not exceed the specified limit. The internal oscillator sets the switching frequency with an accuracy of +/- 1%.

In addition, the LM2576T-12/NOPB includes several protection features such as under-voltage lockout, current-limit, thermal-shutdown and over-voltage protection. These protection features prevent malfunctions caused by overload, under-voltage or overtemperature conditions.

Conclusion

The LM2576T-12/NOPB is an efficient DC-DC switching regulator, designed for applications requiring high efficiency, low-noise, and low-dropout performance. With its wide input voltage range, fast transient response, high power drive and comprehensive protection features, it is an excellent choice for applications requiring not only high efficiency but also low output ripple noise and high power density.

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