SM91509AL-E - Bourns

SM91509AL-E Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  Bourns recommends a symmetrical PCB layout with a solid ground plane, and keeping the input and output traces as short as possible to minimize parasitic inductance and capacitance. A 4-layer PCB with a dedicated power plane is also recommended.
• How do I ensure the device operates within the specified temperature range?
  The SM91509AL-E is rated for operation from -40°C to 125°C. Ensure proper thermal management by providing adequate heat sinking, and avoiding high-power dissipation or high-temperature environments that may exceed the rated temperature range.
• What is the recommended input capacitor value and type?
  Bourns recommends using a low-ESR ceramic capacitor with a value of 10uF to 22uF, and a voltage rating of at least 25V. The capacitor should be placed as close as possible to the VIN pin to minimize parasitic inductance.
• How do I handle the device's enable pin (EN) during power-up and power-down sequences?
  The EN pin should be pulled high during normal operation and pulled low during shutdown. Ensure a clean power-up and power-down sequence by using a slow-rising clock signal or a power-up reset circuit to prevent unwanted switching.
• What is the maximum allowed output capacitance for stable operation?
  The maximum allowed output capacitance is 47uF. Exceeding this value may cause instability or oscillations in the output voltage. It's recommended to use a low-ESR ceramic capacitor with a value of 10uF to 22uF for optimal performance.