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
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