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YB1303 Dataheets PDF



Part Number YB1303
Manufacturers YOBON TECHNOLOGIES
Logo YOBON TECHNOLOGIES
Description Low Dropout LED Driver
Datasheet YB1303 DatasheetYB1303 Datasheet (PDF)

YB1303 Low Dropout LED Driver Description The YB1303 provides a simple solution for driving three channels of any color LEDs with current matching ability. The ultra low dropout LED driver features higher peak efficiency and very low shutdown current. The LED current can be adjusted by an external resistor or the control voltage. The YB1303 can work independently or combine with any boost converters which need to have current matching function for LED drivers. The YB1303 is available in 6-pin ti.

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YB1303 Low Dropout LED Driver Description The YB1303 provides a simple solution for driving three channels of any color LEDs with current matching ability. The ultra low dropout LED driver features higher peak efficiency and very low shutdown current. The LED current can be adjusted by an external resistor or the control voltage. The YB1303 can work independently or combine with any boost converters which need to have current matching function for LED drivers. The YB1303 is available in 6-pin tiny SC70-6 package. Features „ LED Drivers for Parallel Connected „ „ „ „ „ LEDs Only One External Resistor is Needed PWM and Analog Brightness Control No EMI and Switching Noise Power Saving Shutdown Mode (<0.1μA) Small Footprint SC70-6 Package Applications „ LCD Display Modules „ Keyboard Backlight „ PDA, DSC, MP3 players „ LED Displays „ Handheld Computers „ Cell Phones Typical Application Circuit Figure 1: Typical Application Circuit YB1303 Rev.1.0 www.yobon.com.tw 1 YB1303 Low Dropout LED Driver Pin Configuration CTR LED2 LED1 1 2 3 SC70-6 6 5 4 EN LED3 GND Figure 2: Pin Configuration Pin Assignment &Description Table 1 Pin 1 2 3 4 5 6 Name CTR LED2 LED1 GND LED3 EN Description Connect this pin with a resistor to set the LED current. Connect this pin to LED cathode. Connect this pin to LED cathode. Ground pin. Connect this pin to LED cathode. Connect this pin to logic high to enable this chip, logic low to disable this chip. Ordering Information Table 2 Order Number YB1303SC76A Package Type SC70-6 Supplied As 3000 Units Tape & Reel Package Marking Please contact sales representative YB1303 Rev.1.0 www.yobon.com.tw 2 YB1303 Low Dropout LED Driver Absolute Maximum Ratings LED1, LED2, LED3 to GND ........ -0.3V to 6V EN to GND.................................. -0.3V to 6V CTR to GND ............................... -0.3V to 3V Power Dissipation by SC70-6 TA=85℃ ........133mW Junction Temperature Range...............150℃ Storage Temperature Range .....-55℃ to 150℃ Lead Temperature................................250℃ ESD HBM .......................................... 1.5KV ESD CDM ...........................................750V Recommended Operating Conditions LED Cathode Voltage ................. 0.3V to1V Operating Temperature.........-40℃ to 85℃ Electrical Characteristics Table 3 (VIN=3.3 to 5.5V, VEN=3V, TA=25°C, unless otherwise noted. VF is LED forward voltage.) Description LED Cathode Voltage Output Current Multiplication Factor Shutdown Current LED Current LED to LED Current Matching Efficiency SHDN Logic Low Level SHDN Logic High Level η VIL VIH VIN =3.3V, (VIN – VCATHODE) / VIN ILED < 1μA ISET = 100μA 3 ISD ILED Symbol VCATHODE ISET = 100μA, VLED = 300mV VEN = 0V ISET = 100μA -3 90 0.5 Test Conditions MIN 0.3 140 TYP 0.5 200 0.1 20 +3 MAX 1 260 1 μA mA % % V V Units V YB1303 Rev.1.0 www.yobon.com.tw 3 YB1303 Low Dropout LED Driver Typical Performance Characteristics VIN=3.3 to 5.5V, VEN=3V, TA=25°C, unless otherwise noted. VF is LED forward voltage. Iset vs. Control Voltage (RSET=17.4k, Vcathode=0.3V) 160 140 120 22 20 18 LED Current vs. LED Cathode Voltage (Vcontrol=3V, VEN=3V) Rset=17.4k Iset=100uA LED Current (mA) 16 14 12 10 8 6 4 2 0 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 100 Iset (uA) 80 60 40 20 0 0.0 0.5 1.0 1.5 2.0 Vcontrol (V) 2.5 3.0 3.5 4.0 Cathode Voltage (V) LED Current vs. Enable Voltage (Vcontrol=3V, Vcathode=0.3V, Rset=17.4k) 22 20 18 16 LED Current (mA) LED Current (mA) 45 40 35 30 25 20 15 10 5 0 LED Current vs. Rset (VEN=3V, Vcontrol=3V) 14 12 10 8 6 4 2 0 0 1 2 3 VEN Voltage (V) 4 5 6 Vcathode=0.3 Vcathode=0.5 Vcathode=1 0 10 20 30 40 Rset (kOhms) 50 60 70 80 Control Voltage Transient Response Enable Voltage Transient Response YB1303 Rev.1.0 www.yobon.com.tw 4 YB1303 Low Dropout LED Driver Application Information Analog Dimming Control Table Table 4 VEN=3V, VCONTROL=3V voltage. The lower the VLED voltage, the higher the system efficiency. The system efficiency can be calculated as follows: Efficiency = (VIN-VCATHODE) / VIN Thermal Considerations At any given ambient temperature, the maximum package power dissipation can be determined by the following equation: PD(MAX) = [TJ(MAX)-TA] / θJA Constraints for the YB1303 are maximum junction temperature TJ(MAX)=125 ℃ , and package thermal resistance, θJA=300℃/W. The maximum total LED current for YB1303 depends on package power dissipation and the LED cathode voltage at TJ(MAX). At 85℃, PD(MAX)=133mW. At TA = 25℃, PD(MAX)=333mW. The maximum current is calculated by the following equation: ILED < (PD(MAX) / VLED(MAX)) For example, if ILED = 60mA, and TA = 85℃, VLED(MAX) = 2.2V. If the ambient temperature were to increase, the internal die temperature would increase, and the device would be damaged. ILED (mA) 5 10 15 20 25 RSET (kΩ) 75 34 24 17.4 13 Table 5 VEN=3V, RSET=17.4k ILED (mA) 5 10 15 20 25 VCONTROL (V) 1.5 2.1 2.5 3 3.6 Setting the LED Current The LED .


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