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RT8489

Richtek
Part Number RT8489
Manufacturer Richtek
Description High Voltage 4-CH LED Driver Controller
Published May 27, 2016
Detailed Description ® RT8489 High Voltage 4-CH LED Driver Controller General Description The RT8489 is a 4-CH LED driver controller that d...
Datasheet PDF File RT8489 PDF File

RT8489
RT8489

Overview
® RT8489 High Voltage 4-CH LED Driver Controller General Description The RT8489 is a 4-CH LED driver controller that delivers well matched LED current to each channel of LED string.
With external current sources, the number of LEDs per string is only limited by the current source and the VIN/ VOUT conditions.
The current mode PWM Boost type controller operates at an adjustable switching frequency of up to 1MHz, with a wide VIN range covering from 7V to 28V.
The switch driver is designed to drive industrial grade high power MOSFETs.
The PWM loop selects and regulates the LED string with the highest voltage string to 0.
7V, thus allowing voltage mismatches between the LED strings.
The RT8489 automatically detects and excludes any open and/or broken strings during operation from the PWM loop to prevent VOUT from over voltage.
The LED currents on all channels are simply adjustable with a resistor on each channel.
Three convenient dimming methods are provided : 1.
Analog dimming is linearly controlled by an external voltage.
2.
True digitally controlled PWM dimming can regulate the duty cycle of the LED current.
3.
For noise free PWM dimming, use an on board output clamping amplifier as a low pass filter to convert PWM dimming signals into analog dimming signals.
Other protection features include adjustable output over voltage protection, PWM switch current limit and thermal shutdown.
Features z Wide Operation Voltage Range : 7V to 28V z Programmable Channel Current z 3% Current Matching Accuracy between Channels z Adjustable Switching Frequency z Easy Analog and Digital Dimming Control z Adjustable Soft-Start z Adjustable Output Over Voltage Protection z Under Voltage Lockout and Thermal Shutdown z SOP-24 package z RoHS Compliant and Halogen Free Applications z Building and Street Lighting z LED TV Backlight z LED Monitor Backlight z Industrial Display Backlight Simplified Application Circuit VIN VCC R3 L1 CIN CVCC RT8489 VCC GATE RSET ISENSE RVC CVC RSET ...


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