WS9226ProductDescription High Precision PSR Constant Current LED Driver Features Description Built-in650V Power MOSFET The WS9226 is a high precision primary-side feedback Constant current control without secondary sense and and regulation controller for LED lighting, it operates in feedback circuit. constant current control mode and is designed to work in No Auxiliary winding for sensing and supplying inductor Ultra low operating current to improve efficiency especially suitable for flyback convertor under universal input. Universal input voltage The output power of system is recommended to less than ±5% LED current accuracy 24W. LED short and open circuit protection VCC under-voltage protection adopting primary sense and feedback control technology, the Over temperature protection secondary sense and feedback circuit is eliminated. The loop Available in DIP-8 package compensation current discontinuous conduction mode and The WS9226integrates 650V power MOSFET. Since maintaining components stability are overall also removed operating conditions. while The operating current is very low, and it doesn’t need the auxiliary Applications winding for sensing the output current and supplying the chip. LED bulb, spot light The low component counts and small system size are Other LED lighting realized. Since using the proprietary high accurate current sense method, theWS9226 realizes ±5% accuracy of LED current along with excellent line and load regulation. The WS9226 offers rich protection functions including LED open/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 WS9226ProductDescription Pin Configuration and Marking Information The WS9226 is available in DIP8 Package，the top marking is shown as below: WS9226D8P A：Product Code X：Internal Code BCY：Internal Code For QC YMX：D/C Pin Definition Name Pin No. Description GND 1 Ground CS 2 NC 3 No connection, must be floated VCC 4 Power supply NC 5 No connection, must be floated DRAIN 6,7,8 Internal high voltage MOSFET Drain 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 2/8 WS9226ProductDescription Ordering Information Package Marking Part Number 8-Pin DIP-8, Pb-free WS9226D8P WS9226D8P Recommended Operation Conditions Part Number Package WS9226D8P DIP8 Input voltage Maximum output power 175VAC-264VAC ≤36W 90VAC-264VAC ≤24W Absolute Maximum Ratings symbol paramete Range unit Icc_max VCC pin maximum sink current 2.5 mA Drain Internal HV MOSFET drain voltage -0.3~650 V CS Current sense pin input voltage -0.3~7 V TJ Operating junction temperature 165 ℃ TSTG Storage temperature range -55~165 ℃ Note 1: 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 3/8 WS9226ProductDescription Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃) Symbol Parameter Conditions Min Typ Max Units 1mA 17.8 18.8 19.8 V Supply Voltage Section VCC_Clamp VCC clamp voltage UVLO_off Turn-off threshold Voltage 14.3 15.3 16.3 V UVLO_on Turn on threshold Voltage 9 9.5 10 V IST VCC startup current VCC= 13V 150 205 250 uA IOP VCC operating current Fop=70KHz 140 uA Current Sense Section VCS_TH TLEB TDELAY Threshold voltage for peak 390 current limit Leading edge blanking time for current sense Switch off delay time 400 410 mV 350 ns 200 ns Internal driver Section Toff_max Maximum Off Time 310 us Toff_min Minimum Off Time 3.5 us Ton_max Maximum On Time 100 us 7 us Tons_OVP Output OVP Threshold Time MOSFET Section RDS_ON BVDSS IDSS Static drain-source 1.55 on-resistance Drain-source breakdown 1.8 650 voltage Ω V Drain-source leakage 10 current uA Over Temperature Protection TREG WINSEMI Thermal Regulation 150 Temperature MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS ℃ WINSEMI MICROELECTRONICS 4/8 WS9226ProductDescription Application Information Operating Switching Frequency The WS9226 is a high performance power switch The WS9226 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 WS9226integrates 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 inWS9226 is designed to as low as limited in WS9226 to ensure the stability of system. 205uA. 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 WS9226 will start to switch. TheWS9226 integrates a 19V 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 WS9226, The WS9226has 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 400mV 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 350ns 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 400 ( mA) RCS consumption is low. After the system enters into fault latch condition, the VCC voltage will fall until it reaches UVLO The current in LED can be calculatedby the equation: I OUT threshold. Then the system will re-start again. If the fault condition is removed, the system will recover to normal I P_PK N P 4 NS operation. PCB Layouts Where, NP: primary winding turns of transformer The following rules should be followed in WS9226 PCB NS: secondary winding turns of transformer layout IP_PK: peak current in MOSFET Bypass Capacitor The bypass capacitor on VCC should be as close as Power MOSFET possible to the VCC pin and GND pin. The WS9226integrates a 650V power N-MOSFET. It Ground Path can minimize the external component count and reduce the BOM cost and PCB size. The power ground path for current sense should be short, and the power ground path should be separated from The WS9226 uses DIP-8 package. The recommended system output power is below 24W in universal input small signal ground path before the negative of the bulk capacitor. (90Vac~265Vac) application. The Area of Power Loop The area of main current loop should be as small as WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 5/8 WS9226ProductDescription 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 increase the 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 6/8 WS9226ProductDescription Package Information DIP8Package Outline Dimensions D2 θ1 C1 C C4 θ2 C2 C3 θ3 A2 A5 A1 D1 A3 D A4 B A Winsemi Dimensions in Millimeters Symbol Min Max Min Max A 9.00 9.50 0.354 0.374 B 6.10 6.60 0.240 0.260 C 3.0 3.4 0.118 0.134 A1 1.474 1.574 0.058 0.062 A2 0.41 0.53 0.016 0.021 A3 2.44 2.64 0.096 0.104 A4 0.51TYP 0.02TYP A5 0.99TYP 0.04TYP C1 6.6 C2 7.30 0.260 0.50TYP 0.287 0.02TYP C3 3.00 3.40 0.118 0.134 C4 1.47 1.65 0.058 0.065 D 7.62 9.3 0.300 0.366 D1 0.24 0.32 0.009 0.013 D2 WINSEMI Dimensions in Inches MICROELECTRONICS 7.62TYP WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI 0.3TYP MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 7/8 WS9226ProductDescription 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 8/8