RT8458 PWM Buck LED驱动器应用电路
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
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