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RT8477

Richtek
Part Number RT8477
Manufacturer Richtek
Description High Voltage High Current LED Driver
Published Mar 1, 2015
Detailed Description ® RT8477 High Voltage High Current LED Driver General Description The RT8477 is a current mode PWM controller designed...
Datasheet PDF File RT8477 PDF File

RT8477
RT8477

Overview
® RT8477 High Voltage High Current LED Driver General Description The RT8477 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 RT8477 is now available in the SOP-8 package.
Ordering Information RT8477 Package Type S : SOP-8 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, Boost 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  RoHS Compliant and Halogen Free Applications  Desk Lights and Room Lighting  Industrial Display Backlight Pin Configurations (TOP VIEW) VCC ISP ISN CTL 2 3 4 8 CREG 7 DRV 6 GND 5 SENS SOP-8 Marking Information RT8477 GSYMDNN RT8477GS : Product Number YMDNN : Date Code Simplified Application Circuit VIN R4 10 C1 Analog Dimming C5 1µF C2 RT8477 VCC ISP CTL CREG GND ISN DRV SENS R1 LEDs R3 C3 .
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D1 C4 L1 M1 R2 Copyright ©2014 Richtek Technology Corporation.
All rights reserved.
DS8477-02 December 2014 is a registered trademark of Richtek Technology Corporation.
www.
richtek.
com 1 RT8477 Functional Pin Description Pin No.
Pin Name Pin Function 1 VCC Supply Voltage Input.
For good bypass, a low ESR capacitor is required.
2 ISP Positive Input Current Sense.
3 ISN Negative Input Current Sense.
Voltage threshold between ISP and ISN is 100mV.
4 CTL Analog Dimmi...


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