RT8458 PWM Buck LED驅動器應用電路

The RT8458 is a PWM controller with an integrated high side floating gate driver. It is used for step down converters by well controlling the external MOSFET and regulating a constant output current.

The output duty cycle of the RT8458 can be up to 100% for wider input voltage application, such as E27 and PAR30 off-line LED lighting products.

Features
? Low Cost and Efficient Buck Converter Solution
? Universal Input Voltage Range with Off-Line Topology
? Programmable Constant LED Current
? Dimmable LED Current by ACTL
? Output LED String Open Protection
? Output LED String Short Protection
? Output LED String Over Current Protection
? Built-in Thermal Protection
? TSOT-23-6 Package
? RoHS Compliant and Halogen Free

Application
? E27, PAR30, Offline LED Lights

Pin Configurations

TSOT-23-6

Typical Applications Circuit

Figure 1. For Typical Application

Figure 2. For High PF Application