RT8453/RT8453B应用电路（40V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. 更多详细介绍：http:///soft/39/2010/2010093090875.html

Ordering 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 Free

Application

• General Illumination • Desk Lights and Room Lighting • Industrial Backlight/Lighting • Constant Current Source

Pin Configurations

( VIEW) SOP-8 (Exposed Pad)

Typical Applications Circuit