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High Voltage 6-CH LED Driver Controller

RT8488

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The RT8488 is a 6-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 a programmable 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 RT8488 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 programmed 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 programmable output over voltage protection, PWM switch current limit and thermal shutdown.

Applications

  • Building and Street Lighting
  • LED TV Backlight
  • LED Monitor Backlight
  • Industrial Display Backlight
Key Spec.
RT8488
Status Obsolete
Recommended Alternative  RT8491
Vin (min) (V) 7
Vin (max) (V) 28
LED Channels 6
Topology Boost + Current Source
SW Freq (typ) (kHz) 280
Vcs (typ) (mV) 225
Dimming Control Analog;PWM;PWM-to-Analog
Features Adjustable Frequency;Adjustable Soft-Start;Enable Input;OCP;OVP
Package Type WQFN5x5-32
Features
  • Wide Operation Voltage Range : 7V to 28V
  • Programmable Channel Current
  • 3% Current Matching Accuracy between Channels
  • Programmable Switching Frequency
  • Easy Analog and Digital Dimming Control
  • Programmable Soft-Start
  • Automatic Open Channel Detection
  • Programmable Output Over Voltage Protection
  • Under Voltage Lockout and Thermal Shutdown
  • 32-Lead WQFN Package
Reliability
Title Last Update ShareDownload
High Voltage 6-CH LED Driver Controller 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15
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