RT8482應用電路(高電壓高電流LED驅動器控制器)

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.

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.

? High Voltage Capability : V_IN Up to 36V, V_OUT Up 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
? V_IN Under Voltage Lockout and Thermal Shutdown
? 16-Lead WQFN and SOP Packages
? RoHS Compliant and Halogen Free

? General Industrial High Power LED Lighting
? Desk Lights and Room Lighting
? Building and Street Lighting
? Industrial Display Backlight

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更詳細介紹：http://www.qd573.com/soft/39/2010/2010093090874.html

( VIEW)

SOP-16

WQFN-16L 3x3

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