LM5122ZAPWPR datasheet by Texas Instruments

LM5122ZAPWPR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  A 2-layer or 4-layer PCB with a solid ground plane and thermal vias under the IC is recommended. Ensure a low-impedance path for the input and output capacitors.
• How do I ensure stability and prevent oscillations in the output voltage?
  Use a minimum output capacitance of 10uF, ensure the output capacitor's ESR is within the recommended range, and add a 1-2nF capacitor in parallel with the output capacitor to improve stability.
• What is the maximum input voltage that can be applied to the LM5122ZAPWPR?
  The maximum input voltage is 42V, but it's recommended to keep it below 36V to ensure reliable operation and prevent damage to the IC.
• How do I calculate the output voltage ripple and noise?
  Use the formula: ΔVout = (Iout * ESR) / (fsw * Cout), where Iout is the output current, ESR is the output capacitor's equivalent series resistance, fsw is the switching frequency, and Cout is the output capacitance.
• What is the recommended input capacitor value and type for the LM5122ZAPWPR?
  A 10uF to 22uF ceramic or film capacitor with a voltage rating of 50V or higher is recommended. The capacitor should be placed as close to the VIN pin as possible.