代理產線

RT8561

 2013-02-27

【基本資料】

【產品特性】

‧High Voltage : VIN up to 24V, VOUT up to 40V
‧Programmable Channel Current from 10mA to 30mA and Matched to 1.5%
‧Current Mode PWM 1MHz Boost Converter
‧Easy and High Accuracy Digital Dimming by PWM Signal
‧Programmable Soft-Start
‧Automatic Detection of Unconnected and/or Broken Channel
‧Programmable Over Voltage Protection
‧Disconnects LED in Shutdown
‧No Power Sequence Concern
‧VIN Under Voltage Lockout
‧Over Temperature Protection
‧Current Limiting Protection


High Voltage 8-CH LED Driver


【產品應用】

‧UMPC and Notebook Computer Backlight
‧GPS, Portable DVD Backlight
‧Desk Lights and Room Lighting

【文字介紹】

The RT8561C 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 with one driver. The RT8561C 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 RT8561C automati cally 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 programmed with a resistor or a current sink. A very high contrast ratio true digital PWM dimming can be achieved by driving the PWM pin with a PWM signal. Other protection features include programmable output over voltage protection, LED current limit, PWM switch current limit and thermal shutdown.

The RT8561C is available in a WQFN-24L 4x4 package.