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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RT8560 датащи(PDF) 1 Page - Richtek Technology Corporation |
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RT8560 датащи(HTML) 1 Page - Richtek Technology Corporation |
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1 / 15 page  RT8560 1 DS8560-01 April 2011 www.richtek.com High Voltage 4 Channel LED Driver Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Applications UMPC and Notebook Computer Backlight GPS, Portable DVD Backlight Desk Lights and Room Lighting General Description The RT8560 is a 60V 4-channel LED driver capable of delivering 30mA to each channel with 15 LEDs (3.6V per diode) total 60 LEDs with one driver. The RT8560 is a current mode boost converter opearated at 1MHz switching frequency, wide VIN range covers from 7V to 40V and the on-chip current switch is rated at 1.5A. The PWM output voltage loop selects and regulates the LED pin with the highest voltage string to 0.9V allowing voltage mismatches between LED strings. The RT8560 automatically detects and disconnects any unconnected and/or broken strings during operation from PWM loop to prevent VOUT from over voltage. The 3% 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 RT8560. Analog dimming is linearly controlled by an external voltage. With an on-chip output clampping amplifier and a 200k Ω 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 EN pin to PWM shutdown the chip or by driving ACTL pin. Other protecting features include programmable PWM output over voltage protection, LED curren limit, PWM switch current limit and thermal shutdown. The RT8560 is packaged with a tiny footprint package of WQFN-20L 4x4 packages. Features High Voltage : VIN up to 40V, VOUT up to 60V, Driving up to 60 x 3.6V LEDs (15 each channel) Channel Current Programmabe 4mA to 30mA and Matched to 3% Accuracy 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 Digital Dimming : Providing High Accuracy Digital Dimming by PWM at ACTL Pin or EN Pin VIN Under Voltage Lockout Over Temperature Protection Current Limiting Protection Small 20-Lead WQFN Package RoHS Compliant and Halogen Free Pin Configurations (TOP VIEW) WQFN-20L 4x4 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. 1 2 3 4 5 15 14 13 12 11 6 7 89 10 20 19 18 16 17 LED4 GND GND GND GND SW SW EN OVP SS VC 21 Package Type QW : WQFN-20L 4x4 (W-Type) RT8560 Lead Plating System G : Green (Halogen Free and Pb Free) |
Аналогичный номер детали - RT8560 |
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Аналогичное описание - RT8560 |
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