TPS3780DDBVT datasheet by Texas Instruments

TPS3780DDBVT Frequently Asked Questions (FAQs)

• What is the recommended layout for the TPS3780DDBVT to ensure optimal performance?
  The recommended layout for the TPS3780DDBVT involves placing the device close to the power source, using short and wide traces for power and ground, and separating the analog and digital grounds. Additionally, it is recommended to use a solid ground plane and to avoid routing high-frequency signals near the device.
• How do I choose the correct value for the RSET resistor?
  The value of the RSET resistor depends on the desired reset threshold voltage. The datasheet provides a formula to calculate the RSET value based on the desired reset threshold voltage. Typically, a 1% tolerance resistor is recommended to ensure accurate reset threshold voltage.
• What is the purpose of the DELAY pin, and how do I use it?
  The DELAY pin is used to delay the reset signal output after a power-on event. This allows the power supply to stabilize before the reset signal is released. The delay time is set by an external capacitor connected between the DELAY pin and ground. The datasheet provides a formula to calculate the delay time based on the capacitor value.
• Can I use the TPS3780DDBVT with a power supply that has a slow rise time?
  Yes, the TPS3780DDBVT can be used with a power supply that has a slow rise time. However, the device may not detect the power-on event correctly if the rise time is too slow. In such cases, an external circuit may be required to detect the power-on event and generate a reset signal.
• How do I ensure that the TPS3780DDBVT is reset correctly during a power-on event?
  To ensure that the TPS3780DDBVT is reset correctly during a power-on event, the power supply should rise to the reset threshold voltage within the specified time (typically 1ms to 10ms). Additionally, the power supply should be stable and free of noise during the power-on event.