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| DC/DC WHITE LIGHT LED DRIVER General Description EC4006 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 SOP-8 Temperature Range -40 to 85 Part Number EC4006M Marking ID EC4006M Packing Type 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 Pin Configuration EC4006 P / M Package (SOP-8) OH OL CT GND 1 2 3 4 8 7 6 5 DH CS VCC FB Top View Figure 2. Pin Configuration of EC4006 Functional Block Diagram DH 8 Output Buffer 1 OH CS 7 Frequency CKT Control & 2 OL 6 VCC + - 3 Reference CKT CT FB 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 Pin Description Pin Number 1 2 3 4 5 6 7 8 EC4006 Pin Name OH OL CT GND FB Vcc CS 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 Power Supply Voltage Driver Collector Current (Note 2) Switch Current Power Dissipation and Thermal Characteristics Plastic Package, Power Dissipation (TA= 25 Thermal Resistance SOIC Package, Power Dissipation (TA= 25 Thermal Resistance Operating Junction Temperature Storage Temperature Range ESD (Human body model) ) ) PD RJ PD RJA TJ TSTG 1.25 100 625 160 +150 -65 to +150 2000 V W /W mW /W Symbol VCC IC(driver) ISW Value 40 100 0.8 Unit V mA A 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 VCC TA Min 3 -40 Max 36 85 Unit V P3/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 DC/DC WHITE LIGHT LED DRIVER Electrical Characteristics (VCC = 5.0 V, TA =-40 EC4006 Parameter OSCILLATOR Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage OUTPUT BUFFER (Note 3) Saturation Voltage Saturation Voltage DC Current Gain Output Buffer Off-State Current COMPARATOR Threshold Voltage Threshold Regulation Voltage Line Symbol Conditions Vpin 5 =0V TA= 25 to 85 , unless otherwise specified.) Min Typ Max Unit 24 50 24 140 5.2 250 35 65 35 220 6.5 300 42 80 42 260 7.5 350 mV KHz KHz A A FOSC ICHG IDISCHG IDISCHG/ICHG VIPK(sense) CT=1.0nF CT=330pF VCC = 5.0 V to 36 V, TA= 25 VCC = 5.0 V to 36 V, TA= 25 Pin 7 to VCC, TA= 25 ICHG= IDISCHG, TA= 25 IOB= 0.6 A, Pins 1, 8 connected IOB= 0.6 A, RPin 8 = 82 to VCC, Forced = 20 IOB= 0.6 A, VCE = 5.0 V TA= 25 VHL(sat) VHL(sat) hFE 1.0 0.45 50 75 1.3 0.8 V V IOB(off) VTH REGLINE IIB ICC VCE= 36 V 1.225 1.21 0.01 1.250 1.4 -20 100 1.275 1.29 5 -400 A V mV nA TA= 25 TA= -40 to 85 VCC = 3.0 V to 36 V VIN= 0 V VCC= 5.0 V to 36 V, CT = 1.0 nF, Pin 7 = VCC, Vpin 5 > VTH, Pin 2 = GND, other pins open Input Bias Current TOTAL DEVICE Supply Current 4.0 mA 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 Typical Performance Characteristics EC4006 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 Mechanical Dimensions EC4006 P8/8 DR18EC4006-Ver1.0 Dec. 2004 Rev. 1. 0 |
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