BL8312—Non-isolated Constant Current Linear LED Non-isolated Constant Current Linear LED Driver BL8312 FEATURES DESCRIPTIONS Low standby current No need inductor ±3% current accuracy Thermal shutdown protection Thermal compensation Clamp internal voltage of 12V SOT23-5 package Accord the standard of RoHS, totally nonlead and green The BL8312 is a Non-isolated constant current linear LED driver for driving dimmable LED string. The current flow the LED string is charge by the RCS. By Using the company's unique intelligent temperature control technology ,the BL8312 can reduce the LED current when the temperature rises to 100 ℃ and shutdown when the temperature rises to 150 ℃ . BL8312 uses the SOT23-5 package and can be widely used in LED lighting field. APPLICATIONS LED MR16 and general lighting LED E17, E26, E27 lighting LED lighting PACKAGE SOT23-5 Fig1. PIN DESCRIPTIONS Pin Name I/O Description 1 GATE O External Powermos’ Driver 2 GND 3/4 VDD I Input Supply Voltage 5 CS I LED current setting http://www.belling.com.cn Ground 1 Total 7 Page BL8312—Non-isolated Constant Current Linear LED TYPICAL APPLICATION CIRCUIT Fig2. PERIPHERAL DEVICES No. Parameter Typ unit CIN Select Pin Input Capacitance 2.2 uF C1 LED Regulator Capacitor 10 uF R1 Input Current Limiting Resistor 510 KΩ RCS Current Sample Resistor 500mV/ILED(mA) Ω SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM Fig3. http://www.belling.com.cn 2 Total 7 Page BL8312—Non-isolated Constant Current Linear LED MAXIMUM RATINGS Symbol Rating Value Unit VDD Positive DC Supply Voltage 0 to 24 V VCS Sense voltage 0 to 5 V VGATE Output voltage of GATE 0 to 24 V IIN Maximum Input current 3 mA LGATE Peak Current from GATE to external MOS ±300 uA Note : * Power dissipation values are based on conditions: Operating junction temperature TJ and the difference between ambient temperature TA 100 ℃. *Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. * Absolute Maximum Ratings are limits which damage to the device may occur. The maximum rating is just a number, so that the device is not recommended work in this situation. the device work long hours in this situation will affect the reliability of the period. RECOMMENDED OPERATING CONDITIONS Symbol Rating Min Max Unit VDD Positive DC Supply Voltage 10 16 V VCS Sense voltage 0.485 0.515 V VGATE Output voltage of GATE 0 16 V IIN Maximum Input current 500 uA LGATE Peak Current from GATE to external MOS 250 uA 100 ELECTRICAL CHARACTERISTICS Symbol Parameter Test Conditions VDD Input Voltage VIN Rising to 20V IQ Operating Current VCS CS Voltage Gain OP +POWERMOS Gain Tr GATE Rising Time Tf IGATE TTST TTSH TTCT See Fig1 VDD from 0V to 13 See Fig1 ,VIN=20V See Fig2 ,VIN=20V, TA = +25℃ Unit Min Typ Max 10 12 16 V 50 500 uA 0.485 0.515 V 60 dB See Fig4 ,VIN=20V 20 us GATE Falling Time See Fig3 ,VIN=20V 20 us GATE Source Current See Fig4 ,VIN=20V 150 uA GATE See Fig3 ,VIN=20V 150 uA See Fig1 ,VIN=20V 150 ℃ See Fig1 ,VIN=20V 50 ℃ See Fig1 ,VIN=20V 100 ℃ Sink Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Compensation temperature http://www.belling.com.cn VCS_DC=0.5V 3 Total 7 Page BL8312—Non-isolated Constant Current Linear LED TYPICAL PERFORMANCE CHARACTERISTICS PACKAGE DESCRIPTIONS：SOT23-5 E1 0.2500 L1 b L C D E L2 e θ e1 A3 http://www.belling.com.cn A2 A A1 4 Total 7 Page BL8312—Non-isolated Constant Current Linear LED Symbols Dimensions in millimeters Min Typ Max A 1.00 1.10 1.40 A1 0.00 --- 0.10 A2 1.00 1.10 1.30 A3 0.70 0.80 0.90 b 0.35 0.40 0.50 C 0.12 0.125 0.225 D 2.70 2.90 3.10 E1 1.40 1.60 1.80 e1 --- 1.90(typ) --- E 2.60 2.80 3.00 L 0.37 --- --- θ 1° 5° 9° e --- 0.95(typ) --- L1 --- 0.60(typ) --- L1-L2 --- --- 0.12 REFLOW SOLDERING CONDITIONS (I / R convection or VPR Reflow) http://www.belling.com.cn 5 Total 7 Page BL8312—Non-isolated Constant Current Linear LED CLASSIFICATION REFLOW CONFIGURATION INFORMATIONS Profile Feature Lead / Green configuration Average ramp-up rate（from TL to TP） 3℃/s max Preheat -Min temperature（TSmin） 150℃ -Max temperature（TSmax） 200℃ Time（from Min to Max）（tS） 60-180s Holding time： -Temperature （TL） 217℃ -Time(tL) 60-180s Peak / Classification temperature（TP） See table 1 Time of 5℃ peak temperature（tP） 20-40s Ramp-down rate 3℃/s max Time from 25℃ to peak temperature 8min max Tab.1 Lead / Green technology ---Package Classification Reflow Temperatures http://www.belling.com.cn 6 Total 7 Page BL8312—Non-isolated Constant Current Linear LED Volume （mm3） Volume （mm3） Volume （mm3） ＜350 350-2000 ≥2000 ＜2.5mm 260+0℃* 260+0℃* 260+0℃* 1.6-2.5mm 260+0℃* 250+0℃* 245+0℃* ≥2.5mm 250+0℃* 245+0℃* 245+0℃* Package Thickness Note： * Tolerance: The device manufacturer / supplier shall ensure the compatibility of the process, and the status classification temperature should be at the MSL level (this means the peak reflow temperature +0 ℃, for example 260 +0 ℃) http://www.belling.com.cn 7 Total 7 Page