WS3410 Product Description WS3410 Active PFC Non-isolated Buck LED Driver General Description Features � High Power Factor Correction, Low The WS3410 is designed for active PFC non-isolated buck Total Harmonic Distortion LED driver. It operates at valley switching mode with high � Dynamic Temperature Compensation efficiency, low EMI and High PF. The output current � No Auxiliary Winding For Supplying automatically adapt to the variation of the inductance and the � Valley Switching, High efficiency, Low EMI output voltage. The truly constant current LED is realized. � Automatic Compensate the Inductance Variation The WS3410 using SOT23-6 package,It can achieve � Automatic Adapt to the Change of Output Voltage excellent constant current performance with very few external � LED Short Circuit Protection components. � Over Voltage Protection The WS3410 offers rich protection functions, including over � Over Temperature Protection voltage protection, LED short circuit protection, cycle by � Open Circuit Protection cycle current limiting, dynamic temperature compensation, � Few External Components over temperature protection and soft start. WS3410 consumes very low start current and operation current, driving LED efficiently under universal AC input(85VAC~265VAC). WS3410 is available in SOT23-6 package. Applications � LED Driver Supply Typical Application Circuit 6 FB G AT E 4 CS 5 1 VCC 3 C OM P GND 2 W/T-Y0037-Rev.A/ 0 May.2014 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 0514 WS3410 Product Description Pin Definition and Device Marking WS3410 is available in SOT23-6 package. SOT23- 6 1 VCC FB 6 2 GND CS 5 6 10: WS3410 Y: Year 4=2014， .1 0 Y M F 3 COMP M: Month 1,2…A=10,B=11,C=12 F: Factory No. G AT E 4 Pin Function Description Pin Name Pin NO. Description VCC 1 Power supply GND 2 Ground COMP 3 Loop compensation, with a cap to GND. GATE 4 Driver output pins CS 5 Current sampling end FB 6 Feedback signal input. Block Diagram VCC FB 1 G ND 6 2 8.0V OVP UVLO Inter supply Zero-Current Detect Temperature control L o g ic & driver PFC control OTP 200m V CO M P 3 WIN SEM I M ICROELECTRON ICS WIN SEM I OCP Current sense M ICROELECTRON ICS Tel : +86-755-8250 6288 G AT E 1V EA 1 .5 V low-clamp www.winsemi.com 4 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 5 CS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 2/8 WS3410 Product Description Ordering Information Package 6-Pin SOT23-6, Part Number Marking 10YMF WS3410YP Pb-free Absolute Maximum Ratings symbol parameter Range Units -0.3~Vcc_clamp V VCC The power supply voltage input Gate Drive output -0.3~8 V VCS CS current sampling voltage -0.3~7 V VFB Feedback voltage input -0.3~7 V VCOMP Loop Compensation Pin voltage -0.3~7 V PDMAX Power dissipation 0.5 W TJ Max. Operating junction temperature 150 ℃ TSTG Max./Min. Storage temperature range -55~150 ℃ Note:Limit parameter exceed the stated in the table will cause device damage. Do not recommend conditions the device work in more than the limit, in extreme conditions, may affect device reliability. WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 3/8 WS3410 Product Description Electrical Characteristics (Unless otherwise specified，TA=25℃，VCC=8V) Symbol Parameter Conditions Min Typ Max Units 7.5 8.0 8.5 V 5 mA Supply Voltage Section Vcc_clamp VCC Clamping Voltage Icc_clamp VCC Clamping Current VCC_ST VCC Start Up Voltage Vuvlo_HYS VCC Under Voltage Latch Out Hysteresis Ist Start Up Current Iop Operation Current VCC Rise 7.5 V VCC Falling 1.25 V VCC<VCC_ST-0.5V 70 100 uA 400 uA 1 V Current Sensor Section Vocp Current Sensor Voltage Threshold TLEB Leading Edge Blanking 350 ns Td Turn Off Delay Time 200 ns Loop Compensation Section VREF Internal Reference Voltage 194 200 206 mV Internal Reference Voltage TOFF_MIN Min. Demagnetization Time 3 us TON_MAX Max. On Time 20 us Feedback input Section VFB OVP Threshold Voltage 1.6 V VZCD Zero Crossing Checking Threshold 0.2 V Drive Section VOH Output voltage high VCC=8V，Io=20mA 7 V VOL Output voltage low VCC=8V，Io=-20mA Tr Rising time VCC=8V，Cgate=1nF 200 ns Tf Falling time VCC=8V，Cgate=1nF 80 ns 0.5 V Over Temperature Section TSD Thermal Shut Down Temperature 160 ℃ TSD_HYS Thermal Shut Down Hysteresis 30 ℃ WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 4/8 WS3410 Product Description Function Description Sence Resistor The WS3410 is designed for active PFC non-isolated buck The WS3410 is designed for active PFC non-isolated buck LED driver, using SOT23-6 package, It operates under LED driver. It operates under valley switching mode, automatically adapting to the variation of the inductance and the output voltage. It can achieve excellent constant current performance with very few external components. valley switching mode and can achieve high accuracy constant current performance with very few external components. The peak current of inductor is continuous detected. CS terminal is connected internal of the chip, and compared with the internal 200mV. Internal Amplifier’s output COMP adjust the on-time, making the average value so CS equal to 200mV after the system is stable. In addition, a 1V cycle-by-cycle over current Start up The start current is very low, Typ. 70uA(Max. 100uA). Under protection is set up inside CS pin. LED output current: the design system of 85VAC, the startup resistor is: I LED = 85 * 2 R= = 1.2 M 100 0.2V RCS FB Voltage Detection Chip Supply After startup, the output voltage should supply the chip, rectifier diodes D6 need to use fast recovery diodes.Current FB voltage determines the working status of the system, when FB is greater then 1.6V(typ.), WS3410 will automatically considered as output over voltage protection. limiting resistor R4 is calculated as: The system will enter extremely energy efficient hiccup V −9 R4 = (1 − D ) * LED 400uA mode. Output over voltage protection voltage as follows: VOVP = 1.6 * Where, D is duty cycle, 400uA is the normal operation R2 + R3 R3 current of the chip, Vled is output load voltage. The consumption of R4 is: PR 4 = R2,R3,please refer to the typical application diagram, in (VLED − 9) 2 R4 which R3=10k(Not over 15 K, not less than 8.2 K). use 1.3 * (1 − D) instead of constant 1.6 in the above formula in the design of system. Assuming Vovp=90V, we got R2=552k from the For example: above formula, choosing 560k for R2 (larger as far as Requirements:180~260V input voltage, 36~80V output, possible).Because VFB2 is between 1.3 and 1.9, choose 1.9 240mA output current. to calculate the withstand voltage of C4, Vovp=1.9*(10+560)/10=108V,The withstand voltage of C4 The R4 design of above program should be met: 1. Supply Problem when Min. input AC voltage 180V and Min. output voltage 36V(which is the weakest power supply): D=36/180/1.414=0.141,R4=(1-0.141)*(36-9)/400uA=58k shoule larger than the above value, 200V capacitor could be used. WS3410 will automatic detect the output voltage when enters hiccup mode; and will re-enter the normal working state when the output voltage is lower than Vovp. 2.Power consumption problem of R4 when Max. input AC voltage 260V and Max. output voltage 80V(which is the Output Open(Short) protection strongest power supply): Output open/short protection is integrated inside WS3410. D=80/260/1.414=0.218 Once output open/short circuit is detected, the system will The power consumption of R4: automatic enter hiccup mode until the protection signal P=(80-9)*(80-9)/58*(1-0.218)=68mW disappear. WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 5/8 WS3410 Product Description Over Temperature Automatic adjustment of output can get high PF value and low THD. current WS3410 has over temperature regulating function, gradually PCB Design reducing the output current when the power is over The following guidelines should be followed in WS3410 PCB temperature, so as to control the output power and the layout: temperature rise, keeping the power temperature in a setting Bypass Capacitor: The bypass capacitor on VCC pin should value in order to improving the reliability of the system. The be as close as possible to the VCC and GND pins. starting regulation temperature is 135℃. Ground Path: The power ground path for current sense should be short, and the power ground path should be Input Filter Capacitor separated from small signal ground path before the negative In order to obtain high PF value, the input capacitor can not be too large. 10-100nF is recommended. node of the bulk capacitor. The Area of Power Loop: The area of power loop should be as small as possible to reduce EMI radiation. Power Factor Correction Active PFC control circuit is integrated in WS3410, which And the controller should be placed away from the heat generator, such as the power diode. WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 6/8 WS3410 Product Description Package Information SOT23-6 Package Outline Dimensions U n it:m m A C2 B1 B θ1 θ B2 A2 R C D R1 θ2 C1 θ3 R2 D2 A1 D1 D3 Winsemi Dimensions in Millimeters Symbol Dimensions in Inches Min Max Min Max A 2.72 3.12 0.107 0.123 B 1.40 1.80 0.055 0.071 C 1.00 1.20 0.039 0.047 A1 0.90 1.00 0.035 0.039 A2 0.30 0.50 0.012 0.020 B1 2.60 3.00 0.102 0.118 B2 0.119 0.135 0.005 0.005 C1 0.03 0.15 0.001 0.006 C2 0.55 0.75 0.022 0.030 D 0.03 0.13 0.001 0.005 D1 0.30 0.60 0.012 0.024 D2 0.25TYP D3 WIN SEM I 0.60 M ICROELECTRON ICS www.winsemi.com WIN SEM I 0.70 M ICROELECTRON ICS Tel : +86-755-8250 6288 0.01TYP WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 0.024 WIN SEM I M ICROELECTRON ICS 0.028 WIN SEM I M ICROELECTRON ICS 7/8 WS3410 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 WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 8/8