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TPS40071EVM-001 Application Field and Working Principle

The TPS40071EVM-001 evaluation module (EVM) demonstrates the device\'s ability to accurately control, protect and monitor the TI TPS40071 fixed-frequency digital PWM controller. This EVM can be used to evaluate dynamic response, provide system protection, test power system design characteristics, measure P/N pin and other power systems parameters.

The TPS40071EVM-001 comprises a 200W board, which is connected to an isolated current source for precise current sense. The board also has a switch for communication with the onboard EEPROM, and encapsulated power rails for easy placement for prototype buildouts.

The integral controller in the TPS40071EVM-001 allows the digital switching power supply (SMPS) to provide a highly regulated output from a nominal 5V or 12V input. The switching frequencies are approximately 250 kHz for 5V and 500 kHz for 12V. With the integrated feedback loop elements, the system maintains precise output voltage over a wide temperature range, line variations and load variations.

As the TPS40071EVM-001 is a fully integrated solution, it offers extremely fast transient response, under-voltage lockout, over-current protection and two adjustable DACs. This module can achieve an efficiency up to 86% when operated at 12V and 90% at 5V.

Working Principle of TPS40071EVM-001

The TPS40071EVM-001 is a digital switching power supply (SMPS). In essence, it is a feedback-controlled switching regulator that will output a regulated voltage, regardless of the source voltage or load variations. The TPS40071EVM-001 contains a low-side N-channel MOSFET switch and a direction control logic that turns the switch on only when the output voltage is below the programmed level. The feedback voltage is monitored using a low-dropout voltage regulator and a voltage divider network.

When the feedback voltage is low, the low-side switch is turned on, and the inductor and the output capacitors are connected in series across the input voltage. The inductor will now draw a large current from the input, storing it as magnetic energy. When the switch is opened, the stored energy is transferred to the output capacitor, providing the required output voltage.

This process occurs at a fixed frequency, which is determined by the TPS40071\'s built-in oscillator. This process is known as pulse-width modulation (PWM), as the duty-cycle of the switch determines the output voltage. The controller monitors the current through the switch using the integrated current-sense resistor and adjusts the duty-cycle accordingly, thus providing the required output voltage.

The TPS40071 also provides system protection, including under-voltage lockout, over-current protection, and two adjustable digital-to-analog converter (DACs). This on-board circuitry ensures that the converter performs safely and accurately over a wide range of input and output conditions.

Conclusion

The TPS40071EVM-001 is an ideal solution for designing digital switching power supplies (SMPSs). Its wide-range of features, flexible control loops and on-board protection provide a reliable platform for creating efficient and accurate power-supply designs. Combined with the easy-to-use EVM, the TPS40071EVM-001 is the perfect tool for prototyping and testing switching power supply components.

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