WS9221ProductDescription High Precision PSR Constant Current LED Driver Features Description Built-in650V Power MOSFET Constant current control without secondary sense and The WS9221 is a high precision primary-side feedback feedback circuit. and regulation controller for LED lighting, it operates in No Auxiliary winding for sensing and supplying constant current control mode and is designed to work in Ultra low operating current to improve efficiency inductor Universal input voltage especially suitable for flyback convertor under universal input. ±5% LED current accuracy The output power of system is recommended to less than 5W. LED short and open circuit protection CS resistor short circuit protection adopting primary sense and feedback control technology, the VCC under-voltage protection secondary sense and feedback circuit is eliminated. The loop Over temperature protection compensation Available in SOP-7 package maintaining current discontinuous conduction mode and The WS9221integrates 650V power MOSFET. Since components stability are overall also removed operating conditions. while The operating current is very low, and it doesn’t need the auxiliary winding for sensing the output current and supplying the chip. Applications The GU10/E27 LED bulb, spot light Other LED lighting low component counts and small system size arerealized. Since using the proprietary high accurate current sense method, theWS9221 realizes ±5% accuracy of LED current along with excellent line and load regulation. The WS9221 offers rich protection functions including LED open/short circuit protection, CS resistor short circuit protection, over-temperature protection, VCC under voltage protection. Typical Application WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Copyright@WinsemiMicroelectronics Co.,Ltd.,All rightreserved WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 1117 WS9221ProductDescription Pin Configuration and Marking Information The WS9221 is available in SOP7 Package，the top marking is shown as below: Pin Definition Name Pin No. Description CS 1 GND 2 Ground VCC 3 Power supply NC 4 No connection, must be floated DRAIN 5/6 Internal high voltage MOSFET Drain NC 7 No connection, must be floated Current sense. This pin connects a current sense resistor to GND to detect the primary current of transformer. Internal Block Diagram WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 2/4 WS9221ProductDescription Ordering Information Package 7-Pin SOP-7, Pb-free Marking Part Number WS9221S7P WS9221S7P Recommended Operation Conditions Part Number Package WS9221S7P SOP7 Input voltage Maximum output power 175VAC-264VAC ≤7W 90VAC-264VAC ≤5W Absolute Maximum Ratings symbol paramete Range unit Icc_max VCC pin maximum sink current 5 mA Drain Internal HV MOSFET drain voltage -0.3~650 V CS Current sense pin input voltage -0.3~7 V OUT Internal HV MOSFET Source voltage -0.3~8 V TJ Operating junction temperature -40~150 ℃ TSTG Storage temperature range -55~150 ℃ Note : Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/9 WS9221ProductDescription Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃) Symbol Parameter Conditions Min Typ Max Units Supply Voltage Section VCC_Clamp VCC clamp voltage 1mA 7.3 7.9 8.5 V VCC_ON Turn on threshold voltage VCC rising 6.7 7.4 8.0 V V CC_UVLO Turn off threshold voltage VCC falling 5.1 IST VCC startup current VCC= VCC_ON - 1V 45 100 uA IOP VCCoperating current Fop=50kHz 105 250 uA 500 515 mV V Current Sense Section VCS_TH TLEB TDELAY Threshold voltage for peak 485 current limit Leading edge blanking time for current sense Switch off delay time 500 ns 100 ns Switching Frequency Fmax Maximum working frequency 100 kHz Max duty Maximum duty cycle 42 % Fmin Minimum working frequency 3 kHz Mininum OFF time 4 us Output OVP Threshold Time 5.1 us Tons_mi n Tons_O VP MOSFET Section RDS_ON BVDSS IDSS Static drain-source on-resistance Drain-source breakdown voltage Drain-source leakage current Vgs=14V/Ids=0.5A Vgs=0V/Ids=250uA 13 16 650 Ω V Vgs=0V/Vds=650V 10 uA Over Temperature Protection T_comp WINSEMI Thermal Regulation 140 Temperature MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS ℃ WINSEMI MICROELECTRONICS 3/9 WS9221ProductDescription Application Information Operating Switching Frequency The WS9221 is a high performance power switch The WS9221 is designed to work in discontinuous specially designed for LED lighting, with patent constant conduction mode and no external loop compensation current control technology. The WS9221integrates a 650V component is required while maintaining stability. The power MOSFET. The accurate LED current can be realized maximum duty cycle is limited to 42%. The maximum without opto-coupler, TL431 feedback circuit and auxiliary switching frequency at normal operation is suggested to set winding while minimizing the external component count, around 65KHz~70KHz. If the maximum frequency is set too lowering the total bill of material cost. high, it will affect the number of maximum series LED lamps. If set too low, the LED open circuit voltage will be too high. Start Up The maximum and minimum switching frequency is The start-up current in WS9221 is designed to as low as limited in WS9221 to ensure the stability of system. 45uA. The VCC capacitor will be charged through the The switching frequency can be set by the formula: start-up resistor when the system is powered on. Once the f VCC voltage reaches the start-up threshold, the WS9221 will start to switch. The WS9221 integrates a 8V zener for VCC clamping. Due to the ultra-low operating current, the Np 2 VLED 8 Ns 2 Lp I LED Where, LP is the primary winding inductance of auxiliary winding is not needed to supply the IC. transformer. Constant Current Control Protection Function Cycle-by-Cycle current sense is adopted in WS9221, The WS9221 has integrated rich protection functions, the CS is connected to the current sense comparator, and LED open/short protection, CS resistor short circuit the voltage on CS will be compared with the internal 500mV protection, VCC under voltage protection, over temperature reference voltage, the MOSFET will be switched off when protection, and so on. When the LED is open circuit, it will the voltage on CS reaches the threshold. The output of the trigger over-voltage protection logic and latch, the system comparator includes a 500ns leading edge blanking time. stops switching immediately. The primary peak current is given by: I P_PK When the LED short circuit is detected, the system works at low frequency (Fop=3KHz), so the power 500 ( mA) RCS consumption is low. At some catastrophic fault condition, such as shorted CS resistor or flyback transformer The current in LED can be calculatedby the equation: I OUT saturation, the internal fast fault detection circuit will trigger and latch, the system stops switching immediately. I P_PK N P 4 NS After the system enters into fault latch condition, the VCC voltage will fall until it reaches UVLO threshold. Then Where, the system will re-start again. If the fault condition is NP: primary winding turns of transformer removed, the system will recover to normal operation. NS: secondary winding turns of transformer PCB Layouts IP_PK: peak current in MOSFET The following rules should be followed in WS9221 PCB layout: Power MOSFET Bypass Capacitor The WS9221 integrates a 650V power N-MOSFET. It can minimize the external component count and reduce the BOM cost and PCB size. The bypass capacitor on VCC should be as close as possible to the VCC pin and GND pin. Ground Path The WS9221 uses SOP-7 package. The recommended system output power is below 5W in universal input (90Vac~265Vac) application. WINSEMI MICROELECTRONICS The power ground path for current sense should be short, and the power ground path should be separated from small signal ground path before the negative of the bulk WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 5/9 WS9221ProductDescription capacitor. The Area of Power Loop The area of main current loop should be as small as possible to reduce EMI radiation, such as the primary current loop, the snubber circuit and the secondary rectifying loop. NC Pin The NC pin must be left floating to satisfy the requirement of creepage distance. Drain pin To increasethe copper area of drain for thermal consideration. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 6/9 WS9221ProductDescription Package Information SOP7Package Outline Dimensions B2 0.5*0.125±0 . 05 球形标记 A1 A2 D D1 B B1 A C4 A3 R2 θ4 C C1 C2 θ2 C3 θ1 θ3 R1 Winsemi Symbol Dimensions in Millimeters Dimensions in Inches Min Max Min Max A 4.70 5.10 0.185 0.201 B 3.70 4.10 0.146 0.161 C 1.30 1.50 0.051 0.059 A1 0.35 0.48 0.014 0.019 A2 1.27TYP 0.05TYP A3 0.345TYP 0.014TYP B1 5.80 B2 6.20 0.228 5.00TYP 0.244 0.197TYP C1 0.55 0.70 0.022 0.028 C2 0.55 0.70 0.022 0.028 C3 0.05 0.225 0.002 0.009 C4 0.203TYP 0.008TYP D 1.05TYP 0.041TYP D1 WINSEMI 0.40 MICROELECTRONICS WINSEMI 0.80 MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI 0.016 MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS 0.031 WINSEMI MICROELECTRONICS 7/9 WS9221ProductDescription 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:Futian District, ShenZhen Tian An Cyber Tech Plaza two East Wing 1002 Post Code : 518040 Tel : +86-755-8250 6288 FAX : +86-755-8250 6299 Web Site : www.winsemi.com WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 8/9