WS3411H ProductDescription Non-isolated Buck APFC Offline LED Driver Features Description Internal 650V Power MOSFET Active PFC for High Power Factor and Low THD Critical Conduction Mode Operation driver with active PFC, specially designed for universal input System Efficiency up to 95% offline constant current LED lighting. The driver with on-chip Without auxiliary winding PFC circuit achieves high power factor and low THD. Excellent Line and Load Regulation Operating in critical conduction mode, the power MOSFET ±3% LED Output Current Accuracy switching loss is reduced and the inductor is fully utilized. Thermal Regulation Function LED Short/Open Protection few external components, the LED output current can be Current Sensing Resistor Open Protection precisely controlled. Auto Fault Recovery Available in SOP7 Package The WS3411H is a high precision non-isolated buck The WS3411H integrates a 650V power MOSFET. With The WS3411H offers rich protection functions to improve the system reliability, including LED open circuit protection, LED short circuit protection, CS resistor open circuit protection and cycle by cycle current limit. All the protection Applications functions are auto-recovery. The system reliability is further E27 LED Bulb, Spot Light improved by the thermal regulation function. The output PAR30, PAR38 Lamp current is reduced when the driver is over temperature. T8/T10 LED String Other LED Lighting The WS3411H has ultra low start up current and ultra low operating current. The WS3411H is available in SOP7 Package. Typical Application WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Copyright@WinsemiMicroelectronics Co.,Ltd.,All rightreserved WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 1030 WS3411H Product Description Pin Configuration and Marking Information The WS3411H is available in SOP7 Package，the top marking is shown as below: WS3411HS7P A：Product Code X：Internal Code BCY：Internal Code For QC YMX：D/C Pin Definition Name Pin No. Description COMP 1 GND 2 Ground. VCC 3 Power Supply Pin. Connect a bypass capacitor from this pin to GND. FB 4 D 5/6 Internal HV Power MOSFET Drain. CS 7 Current Sense Pin. Connect a resistor to GND to sense the inductor current. Loop Compensation Node. This pin connects a capacitor to GND for stabilization of the control loop, achieving accurate LED current, high Power Factor and low THD. Feedback Voltage Input Pin. This pin detects the inductor demagnetization signal and the output voltage. 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 WS3411H Product Description Ordering Information Package 7-Pin SOP-7, Pb-free Marking Part Number WS3411HS7P WS3411HS7P Recommended Operation Conditions Part Number Package WS3411HS7P SOP7 Input voltage Maximum output power 175VAC-264VAC 60V/150mA 90VAC-264VAC 32V/150mA Absolute Maximum Ratings symbol paramete Range unit VCC Vcc pin voltage -0.3~8 V VD Internal HV MOSFET Drain to Source voltage -0.3-650 V VCS Current sense pin input voltage -0.3~7 V VFB Feedback pin input voltage -0.3~7 V VCOMP Compensation pin voltage -0.3~7 V PDMAX Power dissipation 0.5 W TJ Operating junction temperature 165 ℃ TSTG Storage temperature range -55~165 ℃ 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 3/8 WS3411H Product Description Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃) Symbol Parameter Conditions Min Typ Max 7.5 8.0 8.5 Units Supply Voltage Section Vcc_clamp VCC Clamp Voltage Icc_clamp VCC Clamp Current VCC_ST VCC Turn On Threshold VCC Rising Vuvlo_HYS VCC Turn Off hysteresis VCC Falling 1.32 Ist VCC Startup Current VCC<VCC_ST-0.5V 70 Iop VCC Operating Current 5 7.07 V mA 7.57 8.07 V V 100 uA 400 uA 1 V 350 ns 200 ns Current Sense Section Over current Vocp TLEB Protectionthreshold Leading Edge Blanking Time for Current Sense Td Switch off Delay Time Compensation Section VREF Internal Reference Voltage 194 200 206 mV VCL COMP Low Clamp Voltage 1.5 V VCH COMP High Clamp Voltage 4 V Internal driver TOFF_MIN Minimum Off Time 3 us TON_MAX Maximum On Time 20 us 1.6 V 0.2 V Feedback Section VFB FB Over Voltage Protection Threshold FB Falling Edge VZCD Threshold Voltage Power MOSFET RDSON VDS Static Drain-source 12 On-resistance Drain-Source Breakdown 16 650 Voltage Ω V Thermal Regulation Section TREG WINSEMI Thermal Regulation MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 ℃ 150 Temperature WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 4/8 WS3411H Product Description Application Information RFBL 1.6V RFBL RFBH VOVP The WS3411H is a high precision Active PFC driver integrating 650V power MOSFET, specially designed for non-isolated buck offline constant current LED lighting. Where, Operating in critical conduction mode, the driver achieves RFBL: The lower resistor of the feedback network high power factor, low THD and high efficiency. RFBH: The upper resistor of the feedback network VOVP: Output over voltage setting point Start Up The minimum VOVP should be set about 1.3Vo.It is After system powered up, the VCC pin capacitor is charged up by the start up resistor. When the VCC pin voltage recommended that the FB lower resistor is set to 3.3KΩ—5.1KΩparalleled with a 22pF ceramic capacitor. reaches the turn on threshold, the internal circuits start working. The COMP pin voltage is pulled up to 1.5V quickly, then the WS3411Hstarts switching. The system works at 10k Hz frequency at the beginning, the COMP voltage rises up Protection Functions The WS3411H offers rich protection functions to improve the system reliability. gradually, and the inductor peak current also rises up. The When the LED is open circuit, the output voltage will LED current hence achieves a soft start without overshoot. gradually rise up. The output voltage is sensed by the FB pin After the output voltage is built up, the VCC power is supplied when power MOSFET is turned off. When FB voltage reaches by the output voltage through a diode. the OVP threshold, it will trigger fault logic and the system The maximum value of the startup current is 100uA. For the application of 85VAC —264VAC, the startup resistor can be calculated by the equation: Rst Vin _ min I st _ max stops switching. When the LED is shorted circuit, the system will work under 10k Hz switching frequency. Meanwhile, the output voltage is low and the VCC pin cannot be charged up by the 85V 850 KΩ 100uA output voltage, so the VCC pin voltage will gradually decrease and finally reaches the UVLO threshold. After the system enters into fault condition, the VCC voltage will decrease until it reaches UVLO threshold. Then Constant Current Control The WS3411H utilizes floating ground structure. The inductor current is sensed during the whole switching cycle, thus it achieves high precision output current control and also the system will re-start again. If the fault condition is removed, the system will resume normal operation. When the output is short circuit or the inductor is saturated, the CS peak voltage will be relatively high. When excellent line and load regulation. CS voltage reaches the internal limitation (1V), the power The current in LED can be calculated by the equation: MOSFET will be turned off instantaneously. This cycle by V 200mV I O CS RCS Rcs cycle current limitation can help protecting the power MOSFET, the inductor and the output diode. Rcs is the current sensing resistor. Thermal Regulation The WS3411H integrates thermal regulation function. Feedback Network When the system is over temperature, the output current is The WS3411H senses the output current zero crossing information through the feedback network, the FB falling threshold voltage is set to 0.2V with 0.15V hysteresis. The FB pin is also used to detect output OVP, the threshold voltage is gradually reduced; the output power and thermal dissipation are also reduced. The system temperature is regulated and the system reliability is improved. The thermal regulation temperature is set to 150℃ internally. 1.6V. The ratio of FB upper resistor to lower resistor can be set as: PCB Layouts The following guidelines should be followed in WS3411H PCB layout: 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 WS3411H Product Description Bypass Capacitor FB Pin The bypass capacitor on VCC pin should be as close as possible to the VCC and GND pins. The feedback resistor divider should be as close as possible to the FB pin, and the trace must keeps away from Ground Path dynamic node of the inductor (DRAIN pin trace、the positive The power ground path for current sense resistor should pin and the negative pin of Vo trace), otherwise the FB pin be short and wide, and it should be as close as possible to the OVP function might have risk to be mis-triggered by the IC ground (pin 2), otherwise the LED output current accuracy system noise. maybe affected. The IC signal ground for COMP and FB DRAIN Pin components should be connected to the IC GND pin with To increase the copper area of DRAIN pin for better short traces and should be away from the power ground path. thermal dissipation. However, too large copper area may The Area of Power Loop compromise EMI performance. The area of main current loop should be as small as possible to reduce EMI radiation. The material of PCB Avoid choosing the material that is easy to absorb the moisture, just like paper copper-clad laminates. 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 WS3411H Product Description 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 6.20 B2 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 7/8 WS3411H 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: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