RT8477A

® RT8477A High Voltage High Current LED Driver General Description The RT8477A is a current mode PWM controller designed to drive an external MOSFET for high current LED applications with wide input voltage (4.5V to 50V) and output voltage (up to 50V) ranges. With internal 380kHz operating frequency, the size of the external PWM inductor and input/output capacitors can be minimized. High efficiency is achieved by a 100mV current sensing control. LED Dimming control can be done by analog. The RT8477A is now available in the SOP-8 (Exposed Pad) package. Ordering Information RT8477A Package Type SP : SOP-8 (Exposed Pad-Option 1) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek 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  Buck Constant Current Converter  High Voltage : VIN up to 50V, VOUT up to 50V  380kHz Fixed Switching Frequency  Analog or PWM Control Signal for LED Dimming  Internal Soft-Start to Avoid Inrush Current  Under-Voltage Lockout  Thermal Shutdown Applications  Desk Lights and Room Lighting  Industrial Display Backlight Pin Configurations (TOP VIEW) VCC ISP ISN VC 8 27 GND 36 9 45 CREG DRV SENS CTL SOP-8 (Exposed Pad) Marking Information RT8477AGSP : Product Number RT8477A GSPYMDNN YMDNN : Date Code Simplified Application Circuit VIN Analog Dimming C1 R5 RT8477A VCC C6 ISP ISN CTL DRV C...