TPS5431EVM-173

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The Texas Instruments TPS5431EVM-173 is an evaluation module for non-isolated synchronous buck regulator used as an adjustable voltage source. It operates in a wide input voltage range with an adjustable output current of 0-2A. The TPS5431EVM-173 is ideal for dc-dc buck converter applications in wearable devices, consumer/industrial applications, point of load power supply, and so on. This EVM is also suitable for measurement and analysis in research and development. The EVM user guide provides the detailed information about the features, design considerations, and electrical characteristics.

Introduction

The TPS5431EVM-173 is a synchronous buck evaluation module (EVM) designed for adjustable voltage source (AVS) applications. It is a complete package designed to evaluate all the features of the TPS5431 gate driver IC. The module features all necessary components including a VOUT inductor, two capacitors, diode rectification, etc. It has a maximum output current up to 2A, voltage range adjustable from 0.7 V to 5.5V at a maximum input voltage range of 14V-36V. Additionally, the EVM contains thermal diodes, gate drive protection resistor, and evaluation board protection circuit to ensure safety and efficient operations of the board. This evaluation module is ideal for dc-dc buck converter applications used in consumer/industrial and wearable devices. The EVM user guide also provides an overview of the interface and electrical characteristics.

Working Principle

The TPS5431EVM-173 is a non-isolated synchronous buck regulator suitable to be used as adjustable voltage source (AVS) for off-line SMPS designs. Its output voltage is programmable from 0.7V up to 5.5V with maximum output current of 2 Amps. The TPS5431 IC is the heart of this EVM and it features the ability to adjust the output voltage by using a programmable DAC register. The device features a control logic to synchronize the input switch mode with output pulse waveform. The primary switch node (VSW) is referenced to the OUT node, and is controlled by PWM signal coming from the TPS5431 device. The pulse width modulation signal is supplied by the resistor divider voltage reference connected to THRT and HRT pins. The resistor value and duty cycle can be adjusted to make the output voltage higher or lower as desired.

When the input voltage is applied, the voltage at the input is compared with reference voltage Vref. If it is higher than the reference voltage, the PWM will be high, and switch “S” will “ON” and will connect the input to the ground. This causes the current to flow through the inductor and charge the output capacitor. If the input voltage is less than the reference voltage, the PWM will be low, and switch will be “OFF” and the inductor current will decay. The output of the inductor is fed to the output capacitors, which will store the charge and provide the output voltage.

The other components like resistors and capacitors play minor role but are also important for the smooth operation of the board. The resistors limit the inrush current and protect the board from any potential damage against higher voltages. The numerous capacitors are used to reduce voltage/current ripple and help in smooth operations of the board. These components also provide protection against current spikes during the switching process.

Conclusion

The TPS5431EVM-173 is an ideal evaluation board suitable for DC-DC buck converter applications. It operates in a wide input voltage range with adjustable output current of 0-2A. It is an off-line SMPS and is designed to be used as an adjustable voltage source. The EVM manual provides detailed information about the features, design considerations, and electrical characteristics of the TPS5431 gate driver IC and respective components. All these considerations help the user to quickly assess the synchronization process in order to output the desired output voltage.

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