UC3845B datasheet by STMicroelectronics

UC3845B Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for UC3845B?
  The recommended operating voltage range for UC3845B is 12V to 28V, with a maximum rating of 30V.
• How do I calculate the output voltage of the UC3845B?
  The output voltage of the UC3845B can be calculated using the formula: Vout = Vref x (1 + R2/R1), where Vref is the internal reference voltage (5V), R1 and R2 are the feedback resistors.
• What is the maximum switching frequency of UC3845B?
  The maximum switching frequency of UC3845B is 500 kHz, but it can be adjusted using an external resistor and capacitor connected to the RT pin.
• How do I ensure stability and prevent oscillations in the UC3845B circuit?
  To ensure stability and prevent oscillations, it's essential to follow proper PCB layout guidelines, use a sufficient decoupling capacitor, and add a compensation network (e.g., a pole-zero compensation network) to the feedback loop.
• Can I use the UC3845B as a boost converter?
  Yes, the UC3845B can be used as a boost converter, but it requires additional components and a different configuration. The datasheet provides a typical application circuit for a boost converter.