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RT8577 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8577 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 12 page  1 DS8577-00 November 2011 www.richtek.com RT8577 High Voltage 4-CH LED Driver General Description The RT8577 is an 4-CH LED driver capable of delivering 200mA for each channel. The RT8577 is a current mode boost converter with an adjustable switching frequency via the RT 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 RT8577 automatically 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. 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 status signal will be sent to the system to shut down the IC. Ordering Information Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Features Wide Input Supply Voltage Range : 9V to 28V Adjustable Boost Controller Switching Frequency from 100kHz to 1MHz Programmable Channel Current Channel Current Matching : ±±±±±1.5% External Dimming Control Boost MOSFET Over Current Protection Automatic LED Open/Short Protection to Avoid Output Over Voltage VCC Under Voltage Lockout Adjustable Over Voltage Protection Under Voltage Protection Thermal Shutdown Protection Abnormal Status Indicator for Open/Short/Thermal Condition RoHS Compliant and Halogen Free Applications LCD TV, Monitor Display Backlight LEDDriver Application General Purpose Constant Current Source Pin Configurations (TOP VIEW) WQFN-20L 5x5 Marking Information RT8577ZQW : Product Number YMDNN : Date Code Package Type QW : WQFN-20L 5x5 (W-Type) RT8577 Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free) RT8577 ZQW YMDNN 21 GND LED2 OVP/UVP GND LED1 CREG SEN PGND DRV RISET EN 15 14 13 12 1 2 3 4 11 5 7 8910 19 18 17 16 6 20 |
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