Texas Instruments provides a recommended PCB layout in the TPS65198RUYT evaluation module documentation, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize noise.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. TI recommends using a low-ESR capacitor with a value between 10uF to 22uF, and a voltage rating of at least 2x the output voltage. Additionally, consider the capacitor's temperature rating and derating factors.
Although the datasheet specifies a maximum input voltage of 5.5V, it's recommended to limit the input voltage to 5V to ensure reliable operation and prevent damage to the device. Exceeding 5V may cause internal voltage regulators to malfunction or fail.
The TPS65198RUYT does not have built-in OVP. To implement OVP, you can add an external voltage supervisor or a dedicated OVP IC, such as the TLV7031, to monitor the output voltage and shut down the device in case of an overvoltage event.
The thermal derating for the TPS65198RUYT is specified in the datasheet. To calculate the derating, use the formula: Derating = (TJ(max) - TA) / (RθJA * Pd), where TJ(max) is the maximum junction temperature, TA is the ambient temperature, RθJA is the thermal resistance, and Pd is the power dissipation. Consult the datasheet for specific values and calculations.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
