UCC3817AN datasheet by Texas Instruments

UCC3817AN Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the UCC3817AN to minimize EMI and noise?
  Texas Instruments recommends a compact layout with short traces, and placing the UCC3817AN close to the power stage. Additionally, a solid ground plane and a separate analog ground plane can help reduce noise and EMI.
• How do I choose the right value for the VCC bypass capacitor?
  The recommended value for the VCC bypass capacitor is 1-10uF, with a voltage rating of at least 10V. The capacitor should be placed as close as possible to the VCC pin and ground pin to minimize inductance.
• What is the maximum allowed voltage on the VREF pin?
  The maximum allowed voltage on the VREF pin is 5.5V. Exceeding this voltage can damage the device.
• Can I use the UCC3817AN with a switching frequency above 100kHz?
  While the UCC3817AN can operate at frequencies above 100kHz, it is not recommended as it may lead to increased power losses and reduced efficiency. The device is optimized for operation at frequencies up to 100kHz.
• How do I ensure the UCC3817AN is properly biased during startup?
  To ensure proper biasing during startup, the VCC pin should be ramped up slowly (typically 1-10ms) to allow the internal bias circuitry to stabilize. A soft-start circuit can be used to achieve this.