UC2708DW datasheet by Texas Instruments

UC2708DW Frequently Asked Questions (FAQs)

• What is the recommended layout and PCB design for optimal performance?
  TI recommends a 4-layer PCB with a solid ground plane, and a separate power plane for the high-current output stage. Keep the input and output stages separate, and use a Kelvin connection for the output sense resistors. Refer to the TI application note SLUA271 for more details.
• How do I ensure reliable startup and shutdown of the UC2708DW?
  Use a soft-start circuit to limit the inrush current during startup, and a shutdown circuit to discharge the output capacitors. TI recommends a resistive divider network to control the startup and shutdown sequence. Refer to the TI application note SLUA272 for more details.
• What is the maximum output current capability of the UC2708DW?
  The UC2708DW can deliver up to 8A of output current, but this depends on the specific application, PCB design, and thermal management. TI recommends derating the output current based on the ambient temperature and the device's thermal performance.
• How do I compensate for the output voltage droop during high-current operation?
  Use a type-2 compensation network, which includes a zero and a pole, to stabilize the output voltage. TI recommends using a 1kΩ resistor and a 10nF capacitor for the compensation network. Refer to the TI application note SLUA273 for more details.
• What is the recommended input capacitor type and value for the UC2708DW?
  Use a low-ESR, high-frequency ceramic capacitor (e.g., X7R or X5R) with a value of 10uF to 22uF. This helps to filter the input voltage and reduce noise.