UC3872M datasheet by Texas Instruments

UC3872M Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the UC3872M to minimize EMI and noise?
  TI recommends a compact layout with the controller, power FETs, and output filter components placed close together. Keep the high-current paths short and use a solid ground plane to reduce EMI. Place the controller away from the power FETs and output filter to minimize noise coupling.
• How do I ensure the UC3872M is stable and doesn't oscillate?
  Ensure the compensation network is properly designed and implemented. Use the recommended compensation components and values from the datasheet. Also, make sure the output filter is properly damped and the output voltage is within the recommended range.
• What is the maximum allowable voltage on the VCC pin, and how do I protect it from overvoltage?
  The maximum allowable voltage on the VCC pin is 15V. To protect it from overvoltage, use a voltage regulator or a zener diode clamp to limit the voltage to 15V or less. Additionally, ensure the input voltage to the regulator is within the recommended range.
• How do I implement overcurrent protection using the UC3872M?
  The UC3872M has a built-in overcurrent protection feature. Connect a sense resistor in series with the output inductor and connect the sense resistor to the IS pin. Set the overcurrent threshold by selecting the appropriate resistor value and capacitor value for the IS pin.
• What is the recommended operating temperature range for the UC3872M, and how do I ensure reliable operation over temperature?
  The recommended operating temperature range for the UC3872M is -40°C to 85°C. Ensure reliable operation over temperature by using a thermally conductive package, providing adequate heat sinking, and derating the device's performance at high temperatures.