Linear LED Driver (Preliminary Version) EC4219 Description： EC4219 是一顆 Single channel Linear LED Constant current driver。可由外接電阻調整輸出電流，恒定電流精 度高；輸出電流不隨輸出電壓變化而變化。 Feature： ●可調式輸出電流 5mA-60mA ●恒定電流精度±3% ●過溫保護 ●晶片可與 LED 共用 PCB 板 ● SOP-8(EP) 和 TO252 封裝 Application ● LED 球泡燈 ● LED 燈管、吸頂燈 ABSOLUTE MAXIMUM RATINGS ● Out vs GND：-0.3V~+450V ● Cs vs GND：-0.3V~+9V ● Operating Temperature Range：-20℃~+125℃ ● Junction Temperature Range：-40℃~+150℃ ● Storage Temperature Range：-60℃~+150℃ ● E.S.D(Human Body Mode)：2KV ● E.S.D(Machine Mode)：200V Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional Operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. PIN CONFIGURATION Top View(SOP 8 EP) Top View(TO252) Pin Name Gnd Out Cs NC E-CMOS Corp. (www.ecmos.com.tw) Function Gnd Output Current Current Sensor Not Connect Page 1 of 6 5D09N Rev. F001 Linear LED Driver (Preliminary Version) EC4219 Ordering Information Application Circuit Fig 1. Typical Application Circuit Fig 2. Parallel Application Circuit E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 6 5D09N Rev. F001 Linear LED Driver (Preliminary Version) EC4219 ELECTRICAL CHARACTERISTICS TA = 25°C unless otherwise specified Parameter Output Voltage Output input Voltage Output Current Static Current Cs Voltage Current Compensation Temperature Condition Iout=0mA Iout=30mA -Vout=110V,Cs floating Vout=10V Min -6.5 5 ---- Typ ---0.16 0.6 110 Max 450 --60 0.25 --- Unit V V mA mA V ℃ Output Current Character Output 端輸出電流計算公式為：Iout = Vcs / Rcs ( A ) Fig 3 Output Current vs. Cs Resistance Fig 4. Output constant current curve. E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 6 5D09N Rev. F001 Linear LED Driver (Preliminary Version) EC4219 Fig 5. Output current temperature character 當 LED 燈具內部溫度過高，會引起 LED 燈出現嚴重的光衰，縮短了 LED 燈的使用壽命。如 圖 5 所示，當溫度過高時，晶片內部會使得輸出電流自動減小，以降低燈具溫度。 系統方案設計 Fig. 6 Output efficiency 圖 6 所示應用電路的工作效率如下： PLED / PIN N * VLED * ILED / VIN * ILED N * VLED / VIN 可以看出，系統串聯的 LED 數量越多，系統工作效率越高。亦即 Out 端承受的壓降越低，效 率越高，但同時也必須滿足圖 4 所示的 Output 所需的最低電壓。 E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 6 5D09N Rev. F001 Linear LED Driver (Preliminary Version) EC4219 OUTLINE DIMENSIONS SOP-8L(Exposed PAD) E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 6 5D09N Rev. F001 Linear LED Driver (Preliminary Version) EC4219 OUTLINE DIMENSIONS OUTLINE DRAWING TO252-3L E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 6 5D09N Rev. F001