RT8453/RT8453B应用电路（40V的高电压降压型LED驱动器）

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.

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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 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