WS9931 Product Description LED Ripple Current Elimination Controller Description The WS9931 is an adaptive linear current regulator to Features Eliminate ripple current for single stage LED driver Without external COMP capacitor Built-in soft-start Max Output current is up to 300mA Internal intelligent over temperature protection Operating temperature range from -40℃to135℃ eliminate LED low frequency ripple current. It adopts an adaptive control solution without additional circuit design. It can realize the function of LED light non-filtering with very few external components, so the system cost and size are minimized. The WS9931 is mainly applied in bulb lights and tube lights, especially suitable for COB (chip on board) mode. The operating temperature range of the WS9931 is from -40℃to135℃. The WS9931 is available in ESOP8 Package. Applications LED Tube Lights LED Bulb Lights Typical Application Circuit WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 0319 WS9931 Product Description Pin Configuration and Marking Information The WS9931 is available in ESOP-8 Package. The top marking is shown as below: WS9931EP：Product Code A：Product Code X：Internal Code BCY：Internal Code for QC YMX：D/C Pin Definition（Note: the heat sink at the bottom is connected to Pin 5.） Name Pin No. Description VCC 1 Power Supply NC 2/3/4/6 NA LEDN 5 The negative pin of LED series GND 7/8 Ground Pin Internal Block Diagram WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 2/6 WS9931 Product Description Ordering Information Package Marking Part Number 8-Pin ESOP8,Pb-free WS9931EP WS9931EP Suggestion operating range: Symbol parameter value unit TA Operating temperature -50-135 ℃ Absolute Maximum Ratings Parameter Range unit VIN -0.3~6 V LEDN -0.3~60 V Junction Temperature -40~150 ℃ Lead Temperature（Soldering, 10 sec.） 260 ℃ Storage Temperature -55~150 ℃ Note : Stresses above those listed Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, functional operation of the device should not over these or any of these absolute maximum ratings. Operating above the absolute maximum-rated conditions may affect device reliability. Electrical Characteristics VIN=5V and T=25℃, unless otherwise stated. Symbol Parameter Test condition Min Typ Max Unit Supply Voltage Section VIN VIN clamp voltage 4.8 5 5.2 V IOP VIN operation current 400 500 600 uA 50 60 V 240 300 mA The maximum voltage drop VOVP-VO_MIN between OVP voltage and minimum load voltage Io Adaptive output current 100 Thermal Section Thermal Regulation TTC Temperature Thermal Shutdown TSD Temperature Thermal Hysteresis THYS WINSEMI Temperature MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI 120 ℃ 135 ℃ 18 ℃ MICROELECTRONICS WINSEMI MICROELECTRONICS 3/6 WS9931 Product Description Application Information The typical value of the startup current is 500uA, and The WS9931 is an adaptive linear current regulator to the start-up resistor can be calculated by the equation: eliminate LED low frequency ripple current. It adopts adaptive RST control method and integrates MOS and current sense resistor VO VIN _ MAX to eliminate ripple current without additional electrical design. I VIN _ TYP VO 5.2V 500uA Where, The maximum output current of the WS9931 can be up to Vo is the load voltage in practical application; 300mA, and the value of VOVP-VO_MIN should be less than 60V. VIN_MAX is the maximum clamp voltage, about 5.2V; IVIN_TYP is the operating current, about 500uA. Theory of Current Ripple Removing The WS9931 acquires the sense voltage signal through Over Thermal Protection sampling the output currents signal of the load, and makes the The WS9931 has temperature regulator control. When signals filter. Then it magnifies the error between sense voltage the temperature goes to 120 ℃ , the temperature signals and filter voltage signals, and outputs the signal of error compensation is turned on to increase LED current ripple compensation to regulate output current signals. The WS9931 and reduce the maximum voltage of LEDN. When the drives MOSFET to transfer the LED ripple current to voltage temperature goes to 135 ℃ , over temperature protection ripple on MOSFET, and ensures the constant voltage across starts, and the MOSFET will be in On-State all the time LED string and the current flow through LED string, thus without suppresses function. eliminating ripple current. PCB Layouts The following advices should be followed in WS9931 Start Up The WS9931 integrates soft-start function and is supplied by the preceding stage system. When VVIN rises up over 5V, the WS9931 starts to work. At first, it has 350ms blanking time without current filter function to build up stable reference internally. Then the LED ripple current is decreased by WS9931 gradually. WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI PCB layout: IC Layout ： The IC should be away from heating devices, such as driver MOSFET, freewheeling diodes, inductor and so on. LEDN Pin：To increase the copper area of LEDN pin or to connect to other NC pins for better thermal dissipation. MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 4/6 WS9931 Product Description Package Information ESOP8 Package Outline Dimensions Winsemi Dimensions in Millimeters Symbol Dimensions in Inches Min Max 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° WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 5/6 WS9931 Product Description NOTE: 1.We strongly recommend customers check carefully on the trademark when buying our product, if there is any question, please don't be hesitate to contact us. 2.Please do not exceed the absolute maximum ratings of the device when circuit designing. 3.Winsemi Microelectronics Co., Ltd reserved the right to make changes in this specification sheet and is subject to change without prior notice. CONTACT: Winsemi Microelectronics Co., Ltd. ADD: Room 1002, East, Phase 2, HighTech Plaza,Tian-An Cyber Park,Chegongmiao, FuTian, Shenzhen, P.R. China Post Code : 518040 Tel : +86-755-8250 6288 FAX : +86-755-8250 6299 Web Site : www.winsemi.com WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 6/6