L6398D - STMicroelectronics

L6398D Frequently Asked Questions (FAQs)

• What is the maximum voltage that can be applied to the bootstrap capacitor?
  The maximum voltage that can be applied to the bootstrap capacitor is 35V, as specified in the datasheet. However, it's recommended to keep it below 30V to ensure reliable operation.
• How do I choose the right value for the bootstrap capacitor?
  The bootstrap capacitor value depends on the switching frequency, output current, and voltage. A general rule of thumb is to use a capacitor with a value between 100nF to 1uF, with a voltage rating of at least 25V. A larger capacitor value can be used for higher output currents or lower switching frequencies.
• What is the purpose of the EN pin, and how do I use it?
  The EN (enable) pin is used to enable or disable the device. When the EN pin is high, the device is enabled, and when it's low, the device is disabled. This pin can be used to implement a shutdown function or to synchronize the device with other circuits.
• How do I calculate the output voltage of the L6398D?
  The output voltage of the L6398D is determined by the input voltage, the voltage divider ratio, and the internal reference voltage. The output voltage can be calculated using the formula: Vout = (Vin * R2) / (R1 + R2) + Vref, where Vin is the input voltage, R1 and R2 are the resistors in the voltage divider, and Vref is the internal reference voltage (typically 2.5V).
• What is the maximum output current that the L6398D can deliver?
  The maximum output current that the L6398D can deliver depends on the input voltage, output voltage, and the package type. For the L6398D in a SO8 package, the maximum output current is 2A. However, this value can be limited by the thermal performance of the package and the PCB design.