LM5122ZPWPR datasheet by Texas Instruments

LM5122ZPWPR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the input and output capacitors close to the IC, and use short, wide traces for the power lines.
• How do I ensure stability and prevent oscillations?
  Ensure that the output capacitor has a low ESR, and the input capacitor is at least 10uF. Also, add a 10nF capacitor between the VIN and GND pins to filter out high-frequency noise.
• What is the maximum input voltage that can be applied to the VIN pin?
  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 and current capabilities?
  The output voltage is determined by the resistor divider network (R1 and R2) connected to the FB pin. The output current capability depends on the input voltage, output voltage, and the inductor value. Refer to the datasheet for the calculation formulas.
• 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 or off. Connect it to a logic signal (e.g., from a microcontroller) to enable or disable the converter. When EN is low, the converter is in shutdown mode, and the input current is reduced to <1uA.