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High Voltage 8-CH LED Driver

RT8576

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The RT8576 is an 8-CH LED driver capable of delivering 120mA for each channel. The RT8576 is a current mode boost converter with an adjustable switching frequency via the OSC pin from 100kHz to 1MHz and a wide VIN range from 9V to 28V.

The PWM output voltage loop selects and regulates the LED pin with the highest voltage string to 0.6V, hence allowing voltage mismatches between LED strings. The RT8576 automatically detects and disconnects any unconnected and/or broken strings during operation from PWM loop to prevent VOUT from over voltage.

The 3% matched LED currents on all channels are simply programmed with a resistor. A very high contrast ratio true digital PWM dimming can be achieved by driving the PWM pin with a PWM signal.

When an abnormal situation (open/short/thermal) occurs, a state signal will be sent to the system to shut down the IC.

The RT8576 is available in TSSOP-24 (Exposed Pad) and SOP-24 packages.

Applications

  • LCD TV, Monitor Display Backlight
  • LED Driver Application
  • General Purpose Constant Current Source
Key Spec.
RT8576
Status Active
Vin (min) (V) 9
Vin (max) (V) 28
Vout (max) (V) 45
LED Channels 8
Topology Boost
SW Freq (typ) (kHz) 1000
Vcs (typ) (mV) 500
Dimming Control PWM
Features Adjustable Frequency;Adjustable Soft-Start;Enable Input;OCP;OVP;UVP
Package Type SOP-24;PTSSOP-24
Features
  • Wide Input Supply Voltage Range : 9V to 28V
  • Adjustable Boost Controller Switching Frequency from 100kHz to 1MHz
  • Programmable Channel Current
  • Channel Current Matching : ±3%
  • External Dimming Control
  • Boost MOSFET Over Current Protection
  • Automatic LED Open/Short Protection to Avoid Output Over Voltage
  • VIN Under Voltage Lockout
  • Adjustable Over Voltage Protection
  • Under Voltage Protection
  • Thermal Shutdown Protection
  • Abnormal State Indicator for Open/Short/Thermal Condition
  • RoHS Compliant and Halogen Free
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15
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