深圳叁叶源产品规格书SY1212.pdf

S Y 1 2 1 2 Constant Current LED Driver General Description is a wide input range constant current LED driver provides cost effective solution for advertising light boxes landscape lighting and other LED illumination applications For most setting resistor from SET to GND and one ceramic bypass capacitor from VIN to GND no aluminum capacitor Schottky diode or inductor needed For high current application several high power output resistor connected from LED to SET to reduce chip power dissipation when poor power supply automatically reduce the output current when the die temperature reached 120 this method avoid LED bar blinking Over temperature protection is also be integrated package Ordering Information Order NumberPackage TypeTemp Range DFN 6L 2mm 2mm 40 C to 85 C Features Wide input range from 3 to 40V Simple application circuits Temperature Compensation and Over Temperature Protection function 3 SET voltage accuracy Obtain larger output current by in parallel DFN6L 2mm 2mm package Application Advertising light boxes Landscape lighting The current sense Ideal current source Pin Confi guration DFN 6L 2mm 2mm VIN GND GND 1 6 5 4 3 2 SET LEDVIN Typical Application Circuit SET LED VAS1085B VIN GND 0V VIN GND GND 1 6 5 4 3 2 SET LED Reference HV LDO PWM Control SET LED PWM VIN 200mV Thermal Compensation GND Operational Amplifier VIN SET LEDVIN GND V 12V 0V 1 S Y 1 2 1 2 B S Y 1 2 1 2 B S Y 1 2 1 2 B applications only need one current S Y 1 2 1 2 B can be connected in parallel to obtain S Y 1 2 1 2 B make use of an external power S Y 1 2 1 2 B is used Meanwhile the will S Y 1 2 1 2 B is available with DFN6L 2mm 2mm S Y 1 2 1 2 B 深圳叁叶源电子有限公司 Shenzhen Sunyear Electronic Co LTD S Y 1 2 1 2 Block Diagram Reference HV LDO SET LEDVIN 200mV Thermal Compensation GND Operational Amplifier PIN Description PIN OUT NameDescription 1 2VINPower Supply Input do not over 40V 3 6GNDGround 4SET Current setting pin connect an external resistor ground to set LED current 5LEDConnect to LED cathode EPGND Exposed Pad Connect to a large area ground plane for improved power dissipation Do not use as the only ground connection for the device 2 深圳叁叶源电子有限公司 Shenzhen Sunyear Electronic Co LTD S Y 1 2 1 2 Absolute Maximum Ratings Note1 ParametersMaximum Ratings VIN LED to GND 0 3V to 44V SET 0 3V to 6V Operating temperature range 40 to 85 Junction temperature 40 to 150 Storage temperature range 65 to 150 ESD human body model 2000V Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is functional but do not guarantee specifi c performance limits Electrical Characteristics state DC and AC electrical specifi cations under particular test conditions which guarantee specifi c performance limits This assumes that the device is within the Operating Ratings Specifi cations are not guaranteed for parameters where no limit is given however the typical value is a good indication of device performance Electrical Characteristics Test Condition note 2 VIN 12V TA 25 unless otherwise specifi ed SymbolParameterTest Condition SPEC UnitSymbolParameterTest Condition Min Typ Max Unit VCCInput voltage range340V ICCQuiescent currentNo load200uA VISET ISET pin voltage 200mV IACCU LED current accuracyVLED 0 5V 3 3 VHR LED Minimum head rom voltage to maintain LED current RSET 2 ILED 100mA 0 55V RDSON The conduct resistor between LED to ISET pin 4 TSD Over temperature protection threshold 160 R JA Thermal resistanceDFN 6L 50 W Note 2 Production testing of the device is performed at 25 C Functional operation of the device and parameters specifi ed over other temperature range are guaranteed by design characterization and process control 深圳叁叶源电子有限公司 Shenzhen Sunyear Electronic Co LTD S Y 1 2 1 2 The feature a programmable LED current using a resistor connected between SET and Application Information ground Use the following equation to calculate the sense resistor ILED 0 2V RSET Change the value of RSET can obtain the required constant current The chip power consumption is ILED VD VD is LED cathode voltage In order to get the higher accuracy of the LED output current an 1 or more high precision resistor is commented If the environment temperature changes a lot such as change in 25 C to 85 C use the low temperature coeffi cient resistance to ensure that the resistance value is almost constant 2 Over Heating Issue As the LED power supply rises the LED cathode voltage will follow up this will cause the chip overheating The solve the issue by 1 If the die temperature rise to 120 IC surface temperature is about 80 LED current started to decrease gradually as the temperature reach 160 LED current dropped by half 2 If the temperature continues to increase to 160 When the temperature dropped to 120 work again 3 PCB Layout Careful PCB layout is critical to achieve low switching losses and stable operation Connect a 0 1 F ceramic capacitor between VIN and ground for better noise immunity The SET pin is a high impedance pin do not parallel with any capacitor Minimize the SET pin ground noise by connecting a ground as wide and short as possible Guard Ring and the similar potential signal such as GND line to the surround can prevent RSET interfered 5 The feature a programmable LED current using a resistor connected between SET and S Y 1 2 1 2 B S Y 1 2 1 2 B S Y 1 2 1 2 B enter thermal shutdown mode S Y 1 2 1 2 B re start to S Y 1 2 1 2 B 深圳叁叶源电子有限公司 Shenzhen Sunyear Electronic Co LTD S Y 1 2 1 2 Package Information DFN 6L 6 深圳叁叶源电子有限公司 Shenzhen Sunyear Electronic Co LTD S Y 1 2 1 2 Classification Reflow Profiles Profi le FeaturePb Free Assembly Preheat Soak Temperature min Tsmin Temperature max Tsmax Time Tsmin to Tsmax ts 150 C 200 C 60 120 seconds Average ramp up rate Tsmax to Tp 3 C second max Liquidous temperature TL Time at liquidous tL 217 C 60 150 seconds Peak package body temperature Tp Max 260 C Time tp within 5 C of the specified classification temperature Tc Max 30 seconds Average ramp down rate Tp to Tsmax 6 C secon