IS31LT3135-V1GRLS2-TR
IS31LT3135-V1GRLS2-TR Datasheet
IS31LT3135
| Part | Datasheet |
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IS31LT3135-V1GRLS2-TR |
IS31LT3135-V1GRLS2-TR (pdf) |
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| IS31LT3135 MAIN/SUB DUAL-CHANNEL LED DRIVER IS31LT3135 is a main/sub dual-channel LED driver. When the main channel is a constant current source driving the main LED and the current is set by an external resistor connected to the ISET pin. It needs only 0.1v dropout voltage for 200mA output current. When the sub-channel works, the chip will pull down the sub LED’s cathode to ground. Normally there is only one channel on, the main channel and the sub channel can switch between each other. Sweeping power supply from high voltage to low voltage, main channel switches to sub-channel while UV pin is below the undervoltage threshold 1.17V IS31LT3135-V1 typical or 1.23V IS31LT3135-V2 typical . Sweeping power supply from low voltage to high voltage, the sub-channel switches to the main channel while UV pin is 80mV typical higher than the undervoltage threshold. Additionally, the main channel has short protection function, when the main LED is chip will switch to sub-channel automatically. November 2011 x Power supply undervoltage detect x Main channel short protection x Over-temperature protection x Input voltage range 2.7V~5.5V x Main and sub-channel current set by external resistor x Main channel Vdp=0.1V x Low quiescent current x Assembled in SOP-8 package x Miner lamp x Other LED lighting TYPICAL APPLICATION CIRCUIT IS31LT3135 Figure 1 Integrated Silicon Solution, Inc. IS31LT3135 PIN CONFIGURATIONS Package Pin Configurations Top View SOP-8 PIN DESCRIPTION Name ISET GND MAIN SUB NC 3 6 7 8 Power supply input The pin detects under-voltage. Decouple to ground with 0.1uF capacitor close to device The pin sets the main LED current with external resistor The pin connects to ground. Connect to the cathode of main LED Connect to the cathode of sub LED Not connected ORDERING INFORMATION Industrial Range -40°C to +85°C Order Part No. Package IS31LT3135-V1GRLS2-TR IS31LT3135-V1GRLS2-TR SOP-8, Lead-free SOP-8, Lead-free QTY/Reel 2500 V UV 1.13V~1.21V 1.19V~1.26V Integrated Silicon Solution, Inc. IS31LT3135 ABSOLUTE MAXIMUM RATINGS Supply voltage, VCC UV, Iset, Sub, Main Junction temperature, TJMAX Storage temperature range, Tstg ESD human body mode IMAIN ISUB TA Ambient temperature ~ +6.5V -0.3V to 6.5V +150°C ~ +150°C 4kV 500mA 300mA ~ +85°C Note Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS Test conditions unless otherwise stated Parameter Condition Input voltage Icc Quiescent current Vcc=2.7V~5.5V,no 5.5V>Vuv>1.4V Iratio Ratio of IMAIN to ISET VISET Voltage of ISET pin Iaccuracy Current accuracy of main LED Vcc = 2.7V ~ Main channel current source dropout voltage Rset=47K,Iout=204mA Rsub Sub-channel “ON” resistance Vcc=2.7V~5.5V Switch from main-LED to IS31LT3135-V1 Undervoltage threshold of UV pin sub-LED when VUV sweeps from high voltage to low IS31LT3135-V2 voltage VUVHYS Comparator hysteresis of UV pin Upper threshold Undervoltage threshold |
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