RT8453/RT8453B应用电路（40V的高电压降压型LED驱动器）

RT8453/RT8453B应用电路（V的高电压降压型LED驱动器）
  
  The RT8453B is a buck current mode PWM regulator for LED driving applications. It provides an integrated 1.5A switch and can be operated with a wide input voltage range from 4.5V to 40V. With a 500kHz operating frequency, the RT8453B allows all external inductor and input/output capacitors to be small. High efficiency is achieved with its 190mV current sensing capability. Dimming can be either analog or PWM digital signal driven. The RT8453B is available in a small SOP-8 (Exposed pad) package.
  更多具体介绍：http:///soft/39/2010/2010093090875.htmlOrdering Info
  
  Note :
  Richtek Green products are :
  ? RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
  ? Suitable for use in SnPb or Pb-free soldering processes.Features? Input Operating Range 4.5 to 40V
  ? 1.5A Switching Current Limitation
  ? 10% Constant Current Output Accuracy
  ? Current Mode PWM with 500kHz Switching Frequency
  ? Analog or PWM Control Signal for LED Dimming
  ? Programmable Soft Start
  ? Input Under Voltage Lockout
  ? Over Temperature Protection
  ? RoHS Compliant and Halogen FreeApplication? General Illumination
  ? Desk Lights and Room Lighting
  ? Industrial Backlight/Lighting
  ? Constant Current SourcePin Configurations
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  SOP-8 (Exposed Pad)Typical Applications Circuit