Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good design practices, such as keeping the input and output traces short and separate, using a solid ground plane, and placing decoupling capacitors close to the device.
The output capacitor selection depends on the output voltage, current, and ripple requirements. A general rule of thumb is to choose a capacitor with a capacitance value of at least 10uF and a voltage rating of 1.5 to 2 times the output voltage. Additionally, consider the capacitor's ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance) to ensure it can handle the output current and frequency.
Although the datasheet specifies a maximum input voltage of 42V, it's recommended to derate the input voltage to 36V to ensure reliable operation and to account for voltage spikes and transients.
The TPSM84338RCJR has built-in OVP and UVP features, but they can be adjusted or customized using external resistors and capacitors. Consult the datasheet and application notes for specific implementation details.
The thermal derating curve is provided in the datasheet, and it shows the maximum output current reduction as a function of temperature. Engineers should consider the operating temperature and adjust the output current accordingly to prevent overheating and ensure reliable operation.
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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.
