RT8482应用电路(高电压高电流LED驱动器控制器)

The RT8482 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. With a current sense amplifier threshold of 190mV, the LED current is programmable with one external current sense resistor. With a maximum operating input voltage of 36V and output voltage up to 48V, the RT8482 is ideal for buck, boost or buck-boost operation. With 350kHz operating frequency, the external inductor and capacitors can be small while maintaining high efficiency. Dimming can be either analog or PWM digital. The unique built-in clamping comparator and filter allow easy low noise analog dimming conversion from PWM signal with only one external capacitor. The RT8482 is available in WQFN-16L 3x3 and SOP-16 packages.

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

• High Voltage Capability : VINUp to 36V, VOUTUp to 48V • Buck, Boost or Buck Boost Operation • Current Mode PWM with 350kHz Switching Frequency • Easy Dimming : Analog, PWM Digital or PWM Converting to Analog with One External Capacitor • Programmable Soft Start to Avoid Inrush Current • Programmable Over Voltage Protection • VINUnder Voltage Lockout and Thermal Shutdown • 16-Lead WQFN and SOP Packages • RoHS Compliant and Halogen Free

Application

• General Industrial High Power LED Lighting • Desk Lights and Room Lighting • Building and Street Lighting • Industrial Display Backlight 更详细介绍：http:///soft/39/2010/2010093090874.html

Pin Configurations

( VIEW) SOP-16 WQFN-16L 3x3

Typical Applications Circuit

Figure 1. Analog Dimming in Boost Configuration Figure 2. PWM to Analog Dimming in Boost Configuration Figure 3. Analog Dimming in Buck-Boost Configuration Figure 4. Analog Dimming in Buck Configuration