DIO8241FST3

Rev 1.2 DIO8241F Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Features   Descriptions Regulator for adaptive 100/120Hz current DIO8241F is a regulator for driving internal ripple remove NMOSFET to remove the 100/120Hz LED string Built-in zener diode for input voltage clamping current ripple on AC/DC power. Patented control strategies are optimized for remover current ripple. Nover circuit design  Built-in 100V power MOSFET  Programmable amplitude LED current ripple  Programmable maximum cathode voltage of makes a lower BOM and high cost-effective for flickerless filament. LED  Programmable maximum LED current  Optimized for TRIAC dimming  SOT23-3, SOT23-5 and SOT89-3 packages Applications  LED lighting Ordering Information Order Part Number DIO8241FST3 DIO8241FST5 DIO8241FTC3 www.dioo.com   Top Marking 1013 YWXZ1 1013 YWXZ1 D8241F YWXZ TA Package Green -40 to 125°C SOT23-3 Tape & Reel, 3000 Green -40 to 125°C SOT23-5 Tape & Reel, 3000 Green -40 to 125°C SOT89-3 Tape & Reel,2500 © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev. 1.2   DIO8241F SOT23-5 SOT23-3 SOT89-3 1 VC 2 3 LE D N GND Figure 1 Top View Pin Descriptions Name GND Power Ground NC No Connection VC LED Current Ripple Programming LEDN www.dioo.com   Description Connect to the Cathode of LED string © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Pin Assignment   DIO8241F Stresses beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maxim rating conditions for extended periods may affect device reliability. Parameter Rating Unit 100 V -0.3 to 6 V Junction Temperature 150 °C Lead Temperature 260 °C -65 to 150 °C LEDN VC Storage Temperature Thermal Resistance / θJA Thermal Resistance / θJC SOT23-3 220 SOT23-5 220 SOT89-3 80 SOT23-3 130 SOT23-5 130 SOT89-3 25 °C/W °C/W Recommend Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended Operating conditions are specified to ensure optimal performance to the datasheet specifications. DIOO does not Recommend exceeding them or designing to Absolute Maximum Ratings. Parameter Rating Unit < 100 V 125 °C 0.8~1.2 V SOT23-3 < 250 mW SOT89-3 < 650 mW LEDN Junction Temperature (TJ) Under point VLEDN Power consumption www.dioo.com   © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Absolute Maximum Ratings   DIO8241F Typical value: Vcc=3.6V, TA = 25°C, unless otherwise specified. Symbol Parameter IST Conditions Min. Typ. Max. Unit 1 μA Start-up Current VREF LEDN Compare Voltage ICLMT LED Current Limit RDSON MOS Rdson BV Breakdown Voltage 6 V 60 16 100 mA Ω V Specifications subject to change without notice. Typical Performance Characteristics CVC=1μF, CEC=8.2μF, unless otherwise specified. LED Current Ripple without DIO8241F (VAC=220V,VLED=250V,ILED=15mA) AC Source Power ON (VAC=120V,VLED=125V,ILED=15mA) www.dioo.com   LED Current Ripple with DIO8241F (VAC=220V,VLED=250V,ILED=15mA) AC Source Power OFF (VAC=120V,VLED=125V,ILED=15mA) © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Electrical Characteristics   DIO8241F Function Description DIO8241F is designed for driving one LED string and removing the 100/120Hz LED current ripple. Theory of Operation The LED string and DIO8241F are both supplied by an AC/DC current source. The drain of internal NMOSFET is connected to the cathode of LED string. A sensing resistor Rcs is connected between the source of NMOSFET and GND. DIO8241F drives NMOSFET to transfer the LED current ripple to voltage ripple on NMOSFET, and ensures the constant voltage across LED string and the constant current flow through LED string. The scalable adaptive function of DIO8241F can regulate the cathode voltage of LED string to minimum to improve the efficiency of the system. Current Ripple Removing The capacitor CC between VC and GND is an integral capacitor. DIO8241F transform the voltage on Cc to a reference voltage. The current regulator regulates LED current via negative feedback control. CC should be large enough in order to remove the current ripple of the LED string. However, too large capacitor may slow down the dynamic response. www.dioo.com   © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Block Diagram   DIO8241F DIO8241F controlsthe voltage on CC by monitoring the operation state of built-in N-MOSFET. The efficiency of system is relatively low when N-MOSFET always works in the saturation region. DIO8241F detects it and charges CC to raise the VVC and ILED, then the output voltage of power supply is reduced, and the voltage drop on N-MOSFET decreases. Conversely, when N-MOSFET is working in the linear region, LED current regulation loop is open. DIO8241F detects it and discharges CC to reduce the VVC and ILED, then the output voltage of power supply is raised, and the LED current regulation loop is closed. PCB Design Guideline 1. DIO8241F should be placed far away from the power devices for better thermal performance. 2. The area of LED current loop should be as small as possible. Application Information DIO8241F design guide: IN+ LEDN DIO8241F VC GND IN- 1. The value of the capacitor between VC and GND can determine the final amplitude of the current ripple. It should be large enough in order to remove the current ripple of the LED string. However, too large capacitor may low down the dynamic response. www.dioo.com   © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Adaptive Regulation   DIO8241F COMMON DIMENSIONS (UNITS OF MEASURE=MILLIMETER) Symbol MIN NOM MAX A 1.25 A1 0 0.15 A2 1.00 1.10 1.20 A3 0.60 0.65 0.70 b 0.36 0.50 b1 0.36 0.38 0.45 c 0.14 0.20 c1 0.14 0.15 0.16 D 2.826 2.926 3.026 E 2.60 2.80 3.00 E1 1.526 1.626 1.726 e 0.90 0.95 1.00 e1 1.80 1.90 2.00 L 0.35 0.45 0.60 L1 0.59REF L2 0.25BSC R 0.05 R1 0.05 0.20 Θ 0° 8° Θ1 3° 5° 7° Θ2 6° 14° www.dioo.com   © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Physical Dimensions: SOT23-3   DIO8241F COMMON DIMENSIONS (UNITS OF MEASURE=MILLIMETER) Symbol MIN NOM MAX A 1.25 A1 0 0.15 A2 1.00 1.10 1.20 A3 0.60 0.65 0.70 b 0.36 0.50 b1 0.36 0.38 0.45 c 0.14 0.20 c1 0.14 0.15 0.16 D 2.826 2.926 3.026 E 2.60 2.80 3.00 E1 1.526 1.626 1.726 e 0.90 0.95 1.00 e1 1.80 1.90 2.00 L 0.35 0.45 0.60 L1 0.59REF L2 0.25BSC R 0.10 R1 0.10 0.20 Θ 0° 8° Θ1 3° 5° 7° Θ2 6° 14° www.dioo.com   © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Physical Dimensions: SOT23-5   DIO8241F www.dioo.com   Symbol Min. NOM. Max. A 1.40 1.50 1.60 b 1.68 ‐ 1.77 b1 1.67 1.70 1.73 b2 0.38 ‐ 0.47 b3 0.37 0.40 0.43 b4 0.46 ‐ 0.55 b5 0.45 0.48 0.51 c 0.40 ‐ 0.44 c1 0.39 0.40 0.41 D 4.40 4.50 4.60 D1 4.35 4.45 4.55 D2 1.60 1.75 1.90 D3 0.75 0.90 1.05 D4 1.60 1.70 1.80 E 2.40 2.50 2.60 E1 2.13 ‐ 2.19 e 1.50BSC e1 3.00BSC H 4.05 ‐ 4.25 H1 2.70 ‐ 3.00 H2 0 ‐ 0.10 L 0.89 ‐ 1.20 θ1 6° 8° 10° θ2 3° 5° 7° θ3 85° 90° 95° © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA Physical Dimensions: SOT89-3   DIO8241F Dioo is a professional design and sales corporation for high-quality and performance analog semiconductors. The company focuses on industry markets, such as, cell phone, handheld products, laptop, and medical equipment and so on. Dioo’s product families include analog signal processing and amplifying, LED drivers and charger IC. Go to http://www.dioo.com for a complete list of Dioo product families. For additional product information, or full datasheet, please contact with our Sales Department or Representatives. www.dioo.com   © 2018 DIOO MICROCIRCUITS CO., LTD DIO8241F• Rev.1.2 Adaptive 100/120Hz Current Ripple Remover Max Input Current ≤ 60mA CONTACT US