DD311 Version : PRE.001 Issue Date : 2004/12/7 File Name : SP-DD311-PRE.001.doc Total Pages : 15 HIGH CONSTANT CURRENT LED DRIVER 新竹市展業一路 9 號 7 樓之 1 SILICON TOUCH TECHNOLOGY INC. 9-7F-1, Prosperity Rd I, Science-Based Industrial Park Hsinchu, Taiwan, R.O.C. Fax：886-3-5645626 Tel：886-3-5645656 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 DD311 HIGH CONSTANT CURRENT LED DRIVER General Description DD311 is a single-channel constant current LED driver, which incorporates current mirror and current switch, designed to drive power LEDs. It can provide a maximum sink current of 1A, adjustable by reference current input. The output current is 100 times the input current value set by an external resistor or bias voltage. The Maximum output voltage of 33V can provide more series power LEDs in a string. The output enable allows dimming control or switching power applications. Features Maximum output current: 1A (determined by input reference current) Minimum output voltage: 1V (Iout = 1A) Maximum output voltage: 33V (output leakage current < 0.1uA) Maximum output enable frequency: 1MHz Excellent output current accuracy Applications LED architectural or entertainment lighting LED general or specialty illumination LED backlighting applications Package Types TO-252 HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Block Diagram VLED Vbias IREF ILED REXT OUT EN 1 : 100 VSS GND 1 2 3 4 5 REXT OUT GND VSS EN Pin Connection Pin Description PIN No. PIN NAME FUNCTION 1 REXT Reference current input terminal. 2 OUT Sink constant current outputs (open-drain). 3 GND Ground terminal. 4 VSS Ground terminal. 5 EN Output current enable terminal: VEN = 0V, output current is turned OFF. VEN > 3.3V, output current is turned ON. HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 2 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Maximum Ratings (Ta=25°C, Tj(max) = 125°C) CHARACTERISTIC SYMBOL RATING UNIT Input Reference Current IREF 10 mA Output Current Iout 1.0 A Output Voltage Vout -0.3 ~ 33 Enable Voltage VEN -0.3 ~ 18 Output Enable Frequency FEN 1 MHz GND Terminal Current IGND 1.01 A Power Dissipation Pd 4.2 (Ta=25°C) W Thermal Resistance (Junction to Air) Rth(j-a) 23.38 Thermal Resistance (Junction to Case) Rth(j-c) 1.77 Operating Temperature Top -40 ~ 85 Storage Temperature Tstg -55 ~ 150 V °C/W °C Recommended Operating Condition CHARACTERISTIC Bias Voltage SYMBOL CONDITION MIN. TYP. MAX. force REXT terminal directly 2.7 with an external resistor 5 36 1 33 1 3.3 18 -0.3 0.0 DC 1 Vbias V *1 Output Voltage Vout Driver On Output Voltage Vout Driver Off Output Current Iout Ven > 3.3V *2 VEN(IH) Input Enable Voltage *1 *2 V A IREF = 1mA ~ 10mA VEN(IL) Input Enable Frequency UNIT FEN Ven > 3.3V V MHz Notice that the power dissipation is limited to its package and ambient temperature. The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (33V). HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 3 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Electrical Characteristics (Ta = 25°C unless otherwise noted) CHARACTERISTIC SYMBOL Input Enable Voltage “H” Level CONDITION VEN(IH) MIN. TYP. MAX. 3.3 18 UNIT IREF = 1mA ~ 10mA Input Enable Voltage “L” Level Output Leakage Current (Chip-to-Chip) VEN(IL) Vout = 33 V Ven = 0V IOL1 Output Current Skew V IOL2 *1 Ambient Temperature Regulation η1 IREF = 1mA ~ 10mA -0.3 0.0 0.1 uA TBD TBD % 0.01 % / °C 0.05 mA / °C 1.5 10 %/V Vout = 1.0 V Ambient Temperature Regulation Output Voltage Regulation η2 % / Vout IREF = 1mA ~ 10mA Vout = 1V ~ 3V Switching Characteristics (Ta = 25°C unless otherwise noted) CHARACTERISTIC Propagation Delay (‘L to ‘H’) Propagation Delay (‘H’ to ‘L’) SYMBOL EN-to-OUT (Driver On) tpLH EN-to-OUT (Driver Off) tpHL Output Current Rise Time CONDITION IREF = 10mA MIN. TYP. MAX. 10 50 UNIT (Iout = 1A) VEN(IH) = 5V VEN(IL) = 0V tor VL = 12V ns 25 50 RL = 10 Ω Output Current Fall Time *1 tof CL = 13 pF Chip-to-Chip skew is defined as the range into which any output current of any IC falls. HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 4 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 VL IREF Optional RL REXT R CLED OUT Optional EN VSS C GND CL Switching Characteristics Test Circuit Transient Characteristics In order to reduce the overshoot or undershoot(Vout) during switching large current, it is recommended adding a large enough capacitor between VLED and GND to keep LED supply voltage(VLED) stable. The longer rise time and fall time of the EN dimming signal, adjustable by RC filter, produce the smooth transient response of output current. The two output waveforms illustrating the EN dimming signal with and without RC filter are given below: without RC filter HIGH CONSTANT CURRENT LED DRIVER with RC filter Version:PRE.001 Page 5 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Constant-Current Output Constant-current value is set by the reference current input. The output current will be 100 times the input current value produced by an external resistor between the REXT pin and the bias voltage or, alternatively, force the low bias voltage to REXT pin. Varying the resistor or the bias voltage value can adjust the current scale ranging up to 1A. Notice that the output current is a little increasing or decreasing until the device temperature and ambient temperature are balance. The output current value is calculated roughly by the following equation: ILED (A) ～ 100 × ( Vbias－ VREXT ) / REXT (ohm) = 100 × IREF (A) VLED ILED Vbias IREF REXT DD311 1 2 VREXT 3 4 5 EN Output Current as a Function of REXT value 1100 1000 Vbias=36V ILED (mA) 900 Vbias=24V 800 Vbias=18V 700 Vbias=12V 600 Vbias=5V 500 400 300 200 100 0 100 1000 10000 100000 REXT (ohm) HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 6 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 VLED DD311 Vbias DD311 ILED 1 2 3 4 5 EN Output Current as a Function of Vbias 1100 ILED (mA) 1000 900 VEN = 5V 800 Vout = 1V 700 600 500 400 300 200 100 0 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Vbias (volt) Output Current as a Function of Output Voltage 1.2 Iout = 1A 1.0 Iout=750m Iout (A) 0.8 Iout=500m 0.6 Iout=350m 0.4 0.2 Iout=100m 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 Vout (volt) HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 7 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Ambient Temperature vs. Output Current 1100 1007.0 Iout=1A 1000 1006.5 900 Iout=750mA 1006.0 700 600 Iout (mA) Iout (mA) 800 Iout=500mA 500 Iout=350mA 400 1005.5 1005.0 1004.5 300 200 Vout = 1V, VEN = 12V Iout=100mA 100 Vout = 1V VEN = 12V 1004.0 0 1003.5 -60 -40 -20 0 20 40 60 80 100 120 140 -60 -40 Ambient Temperature (°C) 0 20 40 60 80 100 120 140 120 140 120 140 Ambient Temperature (°C) 505 762 504 761 503 Iout (mA) 760 Iout (mA) -20 759 758 757 Vout = 1V VEN = 12V 756 502 501 500 Vout = 1V VEN = 12V 499 498 497 755 -60 -40 -20 0 20 40 60 80 100 120 -60 140 -40 -20 0 20 40 60 80 100 Ambient Temperature (°C) Ambient Temperature (°C) 357 102.0 101.8 356 101.6 Iout (mA) Iout (mA) 101.4 355 354 353 101.0 100.8 100.6 100.4 Vout = 1V VEN = 12V 352 101.2 Vout = 1V VEN = 12V 100.2 100.0 351 99.8 -60 -40 -20 0 20 40 60 80 100 120 Ambient Temperature (°C) HIGH CONSTANT CURRENT LED DRIVER 140 -60 -40 -20 0 20 40 60 80 100 Ambient Temperature (°C) Version:PRE.001 Page 8 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Enable Voltage vs. Output Current 1100 1020 Iout=1A 1000 900 700 600 Iout (mA) Iout (mA) 1010 Iout=750mA 800 Iout=500mA 500 Iout=350mA 400 1000 990 300 200 Vout = 1V 980 Vout = 1V, Ta = 25°C Ta = 25°C Iout=100mA 100 0 970 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 VEN (volt) 10 12 14 16 18 20 18 20 VEN (volt) 509 764 762 508 Iout (mA) Iout (mA) 760 758 756 754 Vout = 1V 752 Ta = 25°C 507 Vout = 1V 506 Ta = 25°C 750 505 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 353.5 100.80 353.0 100.75 352.5 Vout = 1V 352.0 8 10 12 14 16 V EN (volt) Iout (mA) Iout (mA) VEN (volt) 100.70 Vout = 1V 100.65 Ta = 25°C Ta = 25°C 351.5 100.60 0 2 4 6 8 10 12 14 16 18 VEN (volt) HIGH CONSTANT CURRENT LED DRIVER 20 0 2 4 6 8 10 12 14 16 18 20 VEN (volt) Version:PRE.001 Page 9 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Power Dissipation Notice that the power dissipation of a semiconductor chip is limited to its package and ambient temperature, in which the device requires the maximum output current calculated for given operating conditions. The maximum allowable power consumption can be calculated by the following equation: Pd(max)(Watt) = Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C) Rth(junction-to-air thermal resistance)(°C/Watt) The relationship between power dissipation and operating temperature can be refer to the figure below: Power Dissipation Pd(W) 5.0 4.5 Tj(max)=125 °C 4.0 Rth=23.38 °C/Watt 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 20 40 60 80 100 120 140 Ambient Temperature Ta(°C) Based on the Pd(max), the maximum allowable voltage of output terminal can be calculated as follows: Vout(max)(Volt) = HIGH CONSTANT CURRENT LED DRIVER Pd(max)(Watt)– VREXT(Volt) × IREF(A) Iout(A) × Dimming Duty Version:PRE.001 Page 10 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Typical Application VLED DD311 REXT ILED 1 2 3 4 5 EN Series String (Suggested) VLED Optional In I2 I1 DD311 REXT 1 2 3 4 5 EN ILED = I1+ I2+ … + In Paralleled Strings VLED Optional In I2 I1 REXT Optional DD311 1 2 3 4 5 EN ILED = I1+ I2+ … + In Cross Connected Paralleled Strings HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 11 ILED HIGH CONSTANT CURRENT LED DRIVER 1 2 3 4 DD311 5 ILED REXT VCC 1 2 Version:PRE.001 grayscale control and color manipulation. of DD311 and DM413 offers an ideal solution for high end grayscale signal to control a set of three DD311. The combination input, DM413 can generate maximum of 14 bits RGB PWM configured to act as PWM signal generator. Through serial data typical application, a PWM enabled RGB driver DM413 is system will adapt to precise dimming control. In this display of a capability. By connecting ENABLE pin to a PWM signal output, switching signal (1Mhz max) while providing high current driving 3 4 DD311 DD311 is specifically designed to withstand high frequency REXT VCC 5 11 10 9 6 7 8 12 13 5 14 4 16 15 3 3 2 2 1 1 4 5 GND VCC DD311 DM413 VCC REXT Pull-High Resistance ILED VLED 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Typical Application Page 12 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 Package Outline Dimension TO-252 HIGH CONSTANT CURRENT LED DRIVER Unit: inch Version:PRE.001 Page 13 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 DD311 The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. HIGH CONSTANT CURRENT LED DRIVER Version:PRE.001 Page 14