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LD7889A Datasheet(PDF) 1 Page - Leadtrend Technology |
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LD7889A Datasheet(HTML) 1 Page - Leadtrend Technology |
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1 / 17 page  LD7889A 3/29/2012 1 Leadtrend Technology Corporation www.leadtrend.com.tw LD7889A-DS-00 March 2012 4-Channel LED Backlight Driver REV: 00 General Description The LD7889A is a 4-channel linear current controller which combines with a boost switching controller. It’s an ideal solution for driving high power LED backlights. The LD7889A can deliver high accuracy of constant current to 4 LED strings with 4 internal MOSFET. For each LED string, the current is adjustable to drive up to 240mA. The LD7889A incorporates 4 individual current regulator channels to give accurate driving current for each LED string. The string-to-string tolerance is set within 2%. PWM input pin controls LED brightness from PWM control signals. The other features include LED short and open protection, cycle by cycle current limit, and thermal shutdown. Features Input Voltage range: 4.5V to 36V Drives up to 4 strings in parallel, up to 240mA per string Time-shift PWM dimming control External PWM dimming control LED short circuit protection LED open string protection MOSFET over-current protection Over-temperature protection Status output Applications UMPC and Notebook Computer Backlight Backlight for GPS, Portable DVD LED Backlight for LCD Monitor/ TV Typical Application Fig.1 Typical Circuit for 4 Strings of LED Line Bar |
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