HLMP-3401 - Avago Technologies

HLMP-3401 Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  A thermal pad on the bottom of the package should be connected to a large copper area on the PCB to dissipate heat. A 2-layer or 4-layer PCB with thermal vias is recommended.
• How do I ensure the LED driver is properly biased for optimal performance?
  The EN pin should be tied to a voltage source (e.g., VCC) through a resistor to ensure the driver is enabled. The VCC pin should be decoupled with a capacitor to reduce noise.
• What is the maximum LED current that can be driven by the HLMP-3401?
  The maximum LED current is 350mA per channel, but this can be increased by paralleling multiple channels. However, thermal considerations should be taken into account to avoid overheating.
• How do I program the internal oscillator frequency?
  The internal oscillator frequency can be programmed using external resistors connected to the ROSC pin. The frequency can be calculated using the formula provided in the datasheet.
• What is the purpose of the FAULT pin, and how should it be used?
  The FAULT pin is an open-drain output that indicates an over-temperature or over-current fault condition. It should be connected to a microcontroller or a reset circuit to take corrective action.