SN5440J datasheet by Texas Instruments

SN5440J Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  TI recommends a 4-layer PCB with a solid ground plane, and a separate power plane for the analog and digital supplies. Keep the analog and digital traces separate, and use a common mode choke to filter the power supply.
• How do I ensure reliable operation at high temperatures?
  Use a heat sink with a thermal resistance of less than 10°C/W, and ensure good airflow around the device. Also, derate the output current and voltage according to the thermal derating curve in the datasheet.
• What is the maximum output current capability of the SN5440J?
  The maximum output current is 4A per channel, but it's recommended to limit the current to 3.5A per channel for reliable operation and to prevent overheating.
• How do I configure the device for a specific output voltage?
  Use the VREF pin to set the output voltage. Connect a resistive divider from the output voltage to the VREF pin, and calculate the resistor values according to the desired output voltage and the internal reference voltage (1.25V).
• What is the purpose of the EN pin, and how do I use it?
  The EN (enable) pin is used to turn the device on or off. Connect the EN pin to a logic high (VCC) to enable the device, and connect it to a logic low (GND) to disable the device. Use a pull-up resistor to ensure the EN pin is high during power-up.