BH1900NUX-TR - ROHM Semiconductor

BH1900NUX-TR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  ROHM recommends a thermal pad size of at least 2mm x 2mm, with multiple vias connecting to a solid ground plane to ensure efficient heat dissipation. A thermal resistance of 10°C/W or less is achievable with proper layout design.
• How do I ensure stable operation with a high-impedance output load?
  To ensure stable operation with high-impedance output loads, add a 10nF to 100nF capacitor in parallel with the output to reduce ringing and oscillation. Additionally, consider adding a series resistor (e.g., 10Ω to 100Ω) to the output to improve stability.
• What is the maximum allowed voltage on the EN pin?
  Although the datasheet doesn't specify a maximum voltage for the EN pin, ROHM recommends limiting the voltage to VCC + 0.3V to prevent damage to the internal ESD protection diodes.
• Can I use the BH1900NUX-TR in a high-temperature environment?
  While the BH1900NUX-TR is rated for operation up to 125°C, ROHM recommends derating the output current and voltage to ensure reliable operation. Consult ROHM's application notes for high-temperature operation guidelines.
• How do I troubleshoot output voltage instability or oscillation issues?
  To troubleshoot output voltage instability or oscillation issues, check the PCB layout for proper thermal design, ensure the input voltage is within the recommended range, and verify that the output capacitor is properly sized and placed. Also, check for any noise or ripple on the input voltage and ensure the EN pin is properly driven.