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High Voltage 8-CH LED Driver

RT8561D

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The RT8561D is a 40V 8-CH LED driver capable of delivering 30mA to each channel with 10 LEDs (3.6V per diode), for a total of 80 LEDs per driver. The RT8561D is a current-mode Boost converter that operates at 1MHz, with a wide VIN range from 4.5V to 24V and an on chip current switch rated at 2.5A.

The PWM output voltage loop regulates the LED pins to 0.6V with an auto adjustment circuit allowing voltage mismatches between LED strings. The RT8561D automatically detects and disconnects any unconnected and/or broken strings during operation from the PWM loop to prevent VOUT from over-voltage.

The 1.5% matched LED currents on all channels can be simply adjustable with a resistor or a current sink. A very high contrast true digital PWM dimming can be achieved by driving the PWM pin with a PWM signal.

Other protections including adjustable programmable output over-voltage protection, LED current limit, PWM switch current limit and thermal shutdown are provided.

The RT8561D is available in the WQFN-24L 4x4 package.

Applications

  • UMPC and Notebook Computer Backlight
  • GPS, Portable DVD Backlight
  • Desk Lights and Room Lighting
Key Spec.
RT8561D
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 24
Vout (max) (V) 40
LED Channels 8
Topology Boost
SW Freq (typ) (kHz) 1000
Dimming Control Analog;PWM
Features Adjustable Soft-Start;Current Mode Control;Enable Input;OCP;UVP
Package Type WQFN4x4-24
Features
  • High Voltage : VIN up to 24V, VOUT up to 40V
  • Adjustable Channel Current from 10mA to 30mA
  • 1.5% Channel Current Matching
  • Current-Mode PWM 1MHz Boost Converter
  • Easy and High Accuracy Digital Dimming by PWM Signal
  • Adjustable Soft-Start
  • Automatic Detection of Unconnected and/or Broken Channel
  • Adjustable Over-Voltage Protection
  • Disconnect Adjustable LED in Shutdown
  • No Power Sequence Concern
  • VIN Under-Voltage Lockout
  • Over-Temperature Protection
  • Current Limiting
  • Small 24-Lead WQFN Package
  • RoHS Compliant and Halogen Free
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15
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