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RT8458,LED,驱动相关技术文章RT8458 PWM Buck LED驱动器应用电路driverled驱动器_led驱动器_【richtek/立錡】 rt8458

RT8458,LED,驱动相关技术文章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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