DC/DC WHITE LIGHT LED DRIVER EC4006 General Description The EC4006 is a monolithic constant current white light LED driver using PWM control method. This device consists of internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. This device is specifically designed be used in Step-Down and Step-Up applications with a few external components. The EC4006 package is SOP-8. Features * Operation input voltage from 3.0V to 36V * Low Standby Current * Current Limiting * Output Switch Current to 0.8A * Constant output current * Operation Frequency up to 65KHz (CT=330pF) Applications * White light LED driver SOP-8 Figure 1. Package Types of EC4006 Ordering Information Package Temperature Range Part Number Marking ID Packing Type SOP-8 -40 to 85 EC4006M EC4006M Tape/Reel EC4006M is a standard tin-lead product, EC4006M-F means a Lead Free product. P1/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 Pin Configuration P / M Package (SOP-8) OH 1 8 DH OL 2 7 CS CT 3 6 VCC GND 4 5 FB Top View Figure 2. Pin Configuration of EC4006 Functional Block Diagram DH 8 1 Control & CS Output Buffer 7 Frequency 2 CKT 6 3 VCC OL CT Reference CKT + - FB OH 5 4 GND Figure 3. Functional Block Diagram of EC4006 P2/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 Pin Description Pin Number Pin Name 1 2 3 4 5 6 OH OL CT GND FB Vcc 7 CS 8 DH Function Output buffer high voltage pin Output buffer low voltage pin Timing capacitor to control the switching frequency Ground pin for all internal circuits Feedback pin Voltage supply Peck current sense Input by monitoring the voltage drop across an external I sense resistor to limit the peak current through the switch Voltage driver output buffer Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit VCC 40 V IC(driver) 100 mA ISW 0.8 A Power Dissipation (TA= 25 ) PD 1.25 W Thermal Resistance RJ 100 /W SOIC Package, Power Dissipation (TA= 25) Thermal Resistance PD RJA 625 160 mW /W Power Supply Voltage Driver Collector Current (Note 2) Switch Current Power Dissipation and Thermal Characteristics Plastic Package, Operating Junction Temperature Storage Temperature Range TJ +150 TSTG -65 to +150 2000 V ESD (Human body model) Note1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to thedevice. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Note 2: Maximum package power dissipation limits must be observed. Recommended Operating Conditions Parameter Supply Voltage Ambient Temperature Symbol Min Max Unit VCC 3 36 V TA -40 85 P3/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 Electrical Characteristics (VCC = 5.0 V, TA =-40 to 85, unless otherwise specified.) Parameter Symbol Conditions Min Typ Max Unit 24 50 35 65 42 80 KHz KHz 24 35 42 A 140 220 260 A OSCILLATOR Frequency FOSC Charge Current ICHG Discharge Current IDISCHG Discharge to Charge Current Ratio Current Limit Sense Voltage Vpin 5 =0V TA= 25 CT=1.0nF CT=330pF VCC = 5.0 V to 36 V, TA= 25 VCC = 5.0 V to 36 V, TA= 25 IDISCHG/ICHG Pin 7 to VCC, TA= 25 5.2 6.5 7.5 VIPK(sense) ICHG= IDISCHG, TA= 25 250 300 350 mV OUTPUT BUFFER (Note 3) Saturation Voltage VHL(sat) IOB= 0.6 A, Pins 1, 8 connected 1.0 1.3 V Saturation Voltage VHL(sat) IOB= 0.6 A, RPin 8 = 82 to VCC, Forced = 20 0.45 0.8 V 0.01 100 A 1.250 1.275 1.29 V 1.4 5 mV -20 -400 nA 4.0 mA DC Current Gain hFE IOB= 0.6 A, VCE = 5.0 V 50 75 TA= 25 Output Buffer Off-State Current COMPARATOR IOB(off) VTH Threshold Voltage Threshold Regulation Voltage Input Bias Current Line REGLINE VCE= 36 V TA= 25 TA= -40 to 85 VCC = 3.0 V to 36 V IIB VIN= 0 V ICC VCC= 5.0 V to 36 V, CT = 1.0 nF, Pin 7 = VCC, Vpin 5 > VTH, Pin 2 = GND, other pins open 1.225 1.21 TOTAL DEVICE Supply Current Note 3. Low duty cycle pulse technique is used during test to maintain junction temperature as close to ambient temperature as possible. P4/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 Typical Performance Characteristics P5/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 Typical Applications (A) Step-Up type Figure 9. Step-Up type P6/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 (B) Step-Down type Figure 10. Step-Down type P7/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER EC4006 Mechanical Dimensions P8/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0