Texas Instruments provides a recommended PCB layout for the TPS7B91120DBVR in the datasheet, but it's also recommended to follow general guidelines for thermal management, such as placing thermal vias under the device, using a solid ground plane, and keeping the device away from heat sources.
To ensure stability and prevent oscillations, it's essential to follow the recommended component values and layout guidelines in the datasheet. Additionally, consider using a compensation network, such as a capacitor and resistor in series, to stabilize the output voltage. You can also use simulation tools, such as SPICE, to model and analyze your design.
While the datasheet specifies a maximum input voltage of 18V, it's recommended to derate the input voltage to 16V to ensure reliable operation and prevent damage to the device. Exceeding the maximum input voltage can cause permanent damage to the device.
The TPS7B91120DBVR has built-in overcurrent protection, but it's still important to implement additional fault detection and protection mechanisms in your design. Consider using external components, such as fuses or current-sensing resistors, to detect and respond to fault conditions. You can also use the device's enable pin to shut down the device in case of a fault.
The recommended input capacitor value and type depend on the specific application and operating conditions. As a general guideline, use a low-ESR ceramic capacitor with a value of 10uF to 22uF. The capacitor should be placed as close to the device as possible to minimize noise and ensure stable 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.
