深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 SM2082B Features Patented constant current control technology Output current adjustable with range 5mA~60mA Inter-chip output current deviation <±4% Over temperature protection Sharing PCB board with LED lamps Excellence EMI performance Simple circuit and low cost Package：ESOP8、TO252-2 General Description SM2082B is a single channel LED constant current driver which integrates patented constant current setting and control technology. The output current designed by external REXT is 5mA~60mA and it is invariant to OUT output voltage change, which has better constant current performance. It is a low cost circuit with simple circuit and less external components. Pin Figure Applications T5/T8 LED tubes； LED street lighting； LED bulb lamp，LED ceiling lamp； Diagram 1. SM2082B Each Package Pin Diagram Pin Pin Function OUT Power input and constant current output GND GND REXT Output current setting port Vin 220V~ 1 OUT LED1 LEDn 2 GND C2 3 REXT SM2082B Typical Schematic Circuit Diagram Rext Diagram 2. SM2082B Typical Application Circuit In diagram 2, the power can be AC or DC. Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -1- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Limiting Values The ambient temperature is 25°C if there is no special instruction. Characteristic Parameters Symbol Range Output voltage VOUT -0.5V ~ +250V Output current IOUT 1mA ~ 60mA Operating current TOPT -40°C ~ +120°C Storage temperature TSTG -50°C ~ +150°C ESD withstand voltage VESD 2KV Thermal Resistance Parameters Symbol Explanation ESOP8 TO252-2 Unit RTHJA Thermal 89.2 74.9 ℃/W resistance (1)* 2 Note(1)*：The chip should be mounted on PCB board with 200mm copper (35um thick) to dissipate heat. Electrical Operating Parameters The ambient temperature is 25°C if there is no special instruction. Parameters Output voltage Output withstand Symbol Conditions Min Typ Max Unit VOUT_MIN IOUT = 30mA - - 6.5 V VOUT_BV IOUT = 0 250 - - V IOUT ----- 5 - 60 mA - 0.16 0.25 mA voltage Output current Static current REXT output voltage IOUT deviation Over-temperature Protection point(2)* IDD VOUT = 10V，REXT no connection VREXT VOUT = 10V - 0.6 - V dIOUT IOUT = 20mA - ±4 - % TSC - - 110 - ℃ Note(2)*:When the junction temperature is over 110 ℃, the output current of SM2082B will be reduced. Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -2- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Output Current Characteristics SM2082B output current formula ： I OUT V REXT 0.6V (A )。 rext rext() Diagram 3. SM2082B The Relationship between Output Current and REXT Diagram 4. SM2082B Constant Current Graph Diagram 4 SM2082B constant current graph represents the lowest output voltage (VOUT_MIN：IOUT = 20mA， VOUT_MIN = 4.1V, IOUT = 30mA，VOUT_MIN = 4.6V；IOUT = 40mA，VOUT_MIN = 5.0V；IOUT = 50mA，VOUT_MIN = 5.5V) in normal temperature. Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -3- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Diagram 5. SM2082B Output Current Temperature Characteristics（IOUT = 20mA 和 40mA） Temperature Compensation High temperature inside the LED lamps will cause serious LED light decay, which deduces LED service life. Temperature compensation of SM2082 helps to decrease output current automatically when the inside temperature is more than 110 ºC. Therefore, temperature inside lamps can be reduced. Supply Vin LED1 LED2 LEDn 1 OUT 2 GND GND 3 REXT SM2082B System Design Rext Diagram 6. 82B Application Circuit Efficiency Design Diagram 6 below shows the application circuit efficiency formula： PLED n * V LED * I LED n * V LED PIN VIN * I LED VIN Vin is system input power voltage. VLED is single LED drop voltage. ILED is LED current. It is can be seen that larger quantities of series LED in system brings higher efficiency. In system design, SM2082B output operating voltage is based on application environment so that it optimizes N value. LED Series Number Design Designing LED series number in the system should consider two aspects below: In diagram 6, output voltage is VOUT = Vin – n*VLED. Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -4- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 (1) To ensure the normal operation, output voltage should be VOUT > VOUT_MIN； (2) Lower output voltage brings higher system efficiency. Basing on the two points above, SM2082 output voltage range is VOUT_MIN ~ VOUT_MAX and LED series number formula is: Vin V OUT _ MIN Vin V OUT _ MAX n V LED V LED Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -5- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Typical Application Circuit AC Power Input Diagram 7 shows AC power application circuit for SM2082B. The LED lights inside LED tubes can be designed into series connection, parallel connection or the combination of the two. C1 is high voltage ceramic capacitors to reduce Vin voltage and C2 electrolytic capacitors to reduce Vin voltage ripple. Rext is designed to C1 220V~ LED1-1 LED1-2 LED1-n LED2-1 LED2-2 LED2-n Vin LED lamp 1 OUT C3 C2 2 GND 3 REXT SM2082B set LED current. Rext Diagram 7. SM2082B Typical Application Circuit – AC Power Input The ceramic capacitor C1 is based on AC power and the number of LED series in tubes (0uF ~ 4.7uF). There is no need to use C1 capacitor when the quantity of LED cascade is enough. The larger capacitance C2 produces smaller voltage ripple to Vin, and keeps small ripple to SM2082 output voltage. C2 capacitance depends on total operating current from LED tubes: the more current generates the more C2 capacitance (usually 4.7uF/400V~22uF/400V). The formula is shown below ： C2 capacitance of filter capacitor ： C 2 I LED * t V In the formula, ILED is the constant current in the circuit, and time “ t” (50Hz) = （1/4）*（1/fAC） = 5ms. ΔV is output voltage ripple. Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -6- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 2） IC Parallel Application Diagram 8. SM2082B Parallel Application Circuit The quantity of chip is based on the amount of parallel connection groups and lights operating current of LED tubes. In the diagram below, resistance of REXT1~REXT2 can be the same or different. In IC parallel application, when Rext value is different, the constant current turn-on voltage in the system is the maximum voltage of parallel SM2082. 3） LED Lamps Circuit Access Diagram 9 SM2082B Series Access to LED light tube SM2082B can be connected to GND, middle of LED light or LED light front-end according to the various application conditions.。 Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -7- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Typical Application Circuit EMI Test: 1A/250V C3 103/1KV Vout LED lamp C2 4.7uF 400V R2 1M 1 OUT 2 GND 3 REXT Discharge resistor Filter capacitor SM2082B 220V~ 85 series DB1 MB6S Vin R1 22R EMI Test: Line N shows the test result EMI Test: Line L shows the test result Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -8- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). -9- Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 Package ESOP8 MILLIMETERS MIN MAX INCHES MIN MAX A 1.350 1.750 0.053 0.069 A1 0.050 0.150 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 D1 3.202 3.402 0.126 0.134 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 E2 2.313 2.513 0.091 0.099 e 1.270(BSC) 0.050(BSC) L 0.400 1.270 0.016 0.050 Θ 0° 8° 0° 8° Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). - 10 - Fax: 0755 -29031113 深圳市钲铭科电子有限公司 GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 TO252-2： Mail : [email protected] Tel: 0755 -27593075 Address: 3F,SSMEC Bldg.,15 South 1st Blvd.,South Area,Shenzhen High tech Industrial Park,Nanshan Dist.,Shenzhen. Note: The latest datasheet is subject to the web(www.dianyuanic.com). - 11 - Fax: 0755 -29031113