RD-134 - LM3404 Driving a Seoul Semi Zpower P4 1A LED
Design Specifications
Inputs Outputs #1
VinMin=8.1 Vout1=3.8
VinMax=9.9 Iout1=1.0

Design Description

This demonstration circuit is designed to drive a single Seoul Semiconductor Z-Power P4 LED at a forward current of 1A ± 10% with a peak-to-peak ripple current of 200 mA or less. The expected forward voltage is 3.8V. The input is a 9V alkaline battery. Switching frequency is 700 kHz ± 20%.		   Design Resources
• RD-134 Reference Design Document
• Design files (schematic, board layout)

Additional Resources

•LM3404 Product Folder
•LM3404 Application Notes

Board Layout

RD-134 Board Layout

   Features

  • Integrated 1.0A NFET
  • VIN Range 9V ±10%
  • 1.2A Output Current Limit Over Temperature
  • Input UVLO
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • Separate PWM Dimming and Low Power Shutdown
  • No Output Capacitor
  • Thermal shudown protection
  • SO-8 Package