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The RT8561A is a 40V 8-CH LED driver capable of delivering 30mA to each channel with 10 LEDs (3.6V per diode), total of 80 LEDs with one driver. The RT8561A is a current mode boost converter operated at 1MHz, wide VIN range covers from 6V to 24V and the on-chip current switch is 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 RT8561A automati-cally detects and disconnects any unconnected and/or broken strings during operation from PWM loop to prevent VOUT from over voltage. The 1.5% matched LED currents on all channels are simply programmed with a resistor or a current sink. Both analog dimming and digitally controlled PWM dimming are supported by the RT8561A. Analog dimming is linearly controlled by an external voltage. With an on-chip output clamping amplifier and a 300kΩ resistor, PWM dimming signal is easily low-pass filtered to an analog dimming signal with one external capacitor for noise-free PWM dimming. A very high contrast ratio true digital PWM dimming can be achieved by driving ACTL pin with a PWM signal.Other protecting features include programmable output over voltage protection, LED current limit, PWM switch current limit and thermal shutdown.The RT8561A is packaged with a tiny footprint package of WQFN-24L 4x4 packages.
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  • High Voltage : VIN up to 24V, VOUT up to 40V, Driving up to 80 x 3.6V LEDs (10 each channel) - Channel Current Programmable 10mA to 30mA and Matched to 1.5%- - Current Mode PWM 1MHz Boost Converter- - Easy Analog and Digital Dimming Control- - Programmable Soft Start- - Automatic Detecting Unconnected and/or Broken Channel- - Programmable Over Voltage Protection- - Disconnects LED in Shutdown- - Providing High Accuracy Digital Dimming by PWM at ACTL Pin- - VIN Under Voltage Lockout- - Over Temperature Protection- Current Limiting Protection - Small 24-Lead WQFN Package - RoHS Compliant and Halogen Free
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UMPC and Notebook Computer Backlight<br />GPS, Portable DVD Backlight<br />Desk Lights and Room Lighting
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