UC2854DWTR datasheet by Texas Instruments

UC2854DWTR Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the UC2854DWTR to minimize EMI and ensure reliable operation?
  TI recommends a 4-layer PCB with a solid ground plane, and placing the IC close to the input capacitors. Keep the input and output traces short and away from each other to minimize EMI.
• How do I ensure the UC2854DWTR is stable and doesn't oscillate?
  Ensure the output voltage is within the recommended range, and the output capacitor is of sufficient value and type. Also, add a small capacitor (e.g., 10nF) between the COMP pin and GND to improve stability.
• What is the maximum input voltage that the UC2854DWTR can handle?
  The UC2854DWTR can handle up to 18V input voltage, but it's recommended to keep it below 15V for reliable operation and to prevent overheating.
• How do I calculate the output voltage of the UC2854DWTR?
  The output voltage is determined by the resistive divider network connected to the FB pin. Use the formula: Vout = (R1 / R2) * (1.25V) + Vref, where R1 and R2 are the resistors in the divider network.
• What is the purpose of the EN pin, and how do I use it?
  The EN (Enable) pin is used to turn the converter on and off. Connect it to a logic high (e.g., VCC) to enable the converter, and to a logic low (e.g., GND) to disable it.