UC3845D8G4 datasheet by Texas Instruments

UC3845D8G4 Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of UC3845D8G4?
  The maximum operating frequency of UC3845D8G4 is 500 kHz, but it can be extended up to 1 MHz with proper design and layout considerations.
• How do I ensure stable operation of UC3845D8G4 in my design?
  To ensure stable operation, make sure to follow the recommended layout guidelines, use a stable voltage supply, and decouple the IC properly. Also, ensure that the feedback loop is properly compensated and the output voltage is within the specified range.
• What is the purpose of the soft-start pin (SS) in UC3845D8G4?
  The soft-start pin (SS) is used to control the output voltage rise time during startup. It helps to reduce the inrush current and prevents output voltage overshoot. A capacitor connected to this pin determines the soft-start time.
• Can I use UC3845D8G4 for isolated flyback converter designs?
  Yes, UC3845D8G4 can be used for isolated flyback converter designs. However, you need to ensure that the feedback loop is properly isolated using an optocoupler or a transformer, and the IC is properly biased and configured for isolated operation.
• How do I calculate the minimum and maximum input voltage for UC3845D8G4?
  The minimum input voltage is typically 8.5V, and the maximum input voltage is 18V. However, the actual input voltage range may vary depending on the specific application and design requirements. Consult the datasheet and application notes for more information.