LNK604DG datasheet by Power Integrations

LNK604DG Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the LNK604DG?
  The maximum operating temperature range for the LNK604DG is -40°C to 150°C, but the device is typically specified for operation up to 125°C.
• How do I ensure the LNK604DG is properly biased for startup?
  To ensure proper biasing for startup, make sure the VCC pin is connected to a stable voltage source (typically 12V to 18V) and the EN/UV pin is pulled high (above 2.5V) to enable the device.
• What is the recommended layout and PCB design considerations for the LNK604DG?
  For optimal performance, follow Power Integrations' recommended layout guidelines, including keeping the high-voltage nodes (e.g., DRAIN, SOURCE) away from low-voltage nodes (e.g., VCC, EN/UV), using a solid ground plane, and minimizing trace lengths and widths.
• How do I select the correct transformer for use with the LNK604DG?
  Choose a transformer with a turns ratio that matches the desired output voltage, and ensure the transformer's primary inductance is within the recommended range (typically 1.5mH to 3.5mH) to achieve optimal performance and efficiency.
• What are the key considerations for EMI filtering and noise reduction when using the LNK604DG?
  To minimize EMI and noise, use a common-mode choke, add a Y-capacitor between the primary and secondary windings, and ensure proper PCB layout and grounding. Additionally, consider using a shielded transformer and adding a snubber circuit to reduce ringing.