WS3240 ProductDescription High Precision PSR LED Constant Current Driver Features Description Built-in 650V UHV Power MOS LED Constant Current: ±5% Fixed Primary Peak Current: 185mA constant current LED driver, suitable for flyback isolated Without the Secondary winding LED in sub 4W power range at universal AC input. It Start up time less than 100ms operates in discontinuous current mode. High precision constant current regulation due to WS3240 is a high precision primary side feedback WS3240 integrates 650V power MOS. It operates in patented CC control primary side sensing and regulation, without a secondary Built-in line compensation feedback circuit, also need not the auxiliary transformer Ultra low operation current winding detection and power supply, only need few Maximum power 4W peripheral components can realize constant current, LED open/short protection greatly saves the cost and size of the system. Floating pin protection Excellent EMI performance with PFM control universal AC input with the high voltage start technology, Cycle-by-cycle current limit realizing instant bright of the LED lamp. Built-in leading Edge Blanking VDD Under Voltage Lockout（UVLO） with high precision current sampling circuit and line Built-in over temperature protection compensation. With patented constant current controlling The start time of WS3240 is less than 100ms at The current precision is less than ± 5% mode, excellent linear regulation is achieved. WS3240 Applications provides a variety of comprehensive protection mode, including: cycle by cycle current limit LED lighting protection(OCP), LED open/short circuit protection, under voltage protection and clamping, over temperature protection, pin floating protection etc.. WS3240 is offered in TO-92 package. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 1201 WS3240 ProductDescription Typical Application Pin Configuration and Marking Information WS3240 is offered in TO-92 package, as bellows: WS3240NP A：Product Code X：Internal Code BCY：Internal Code For QC YMX：D/C Pin Definition Pin Name Pin No. Pin Type Function Description Drain 1 Drain The drain terminal of Power MOSFET GND 2 Ground Ground. VDD 3 Power Power Supply. 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 WS3240 ProductDescription Internal Block Diagram Ordering Information Package Marking Part Number 3-Pin TO-92, Pb-free WS3240NP WS3240NP Recommended Operation Conditions Part Number Package WS3240NP TO-92 Input voltage Maximum output power 175VAC-264VAC 4 W 90VAC-264VAC 3 W Absolute Maximum Ratings symbol paramete limites unit VDD Power Supply 7 V Ivdd_max VDD Clamping current 10 mA Drain Drain of internal power MOS -0.3~650 V Tj Maximun junction temperature 150 ℃ Tjo Operating temperature range -40~150 ℃ TSTG Minimun/Maximum storage temperature -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 3/8 WS3240 ProductDescription Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃) Symbol Parameter Conditions Min Typ Max Units Supply Voltage Section VDD_C LAMP VDD_re g UVLO_ off VDD Clamping Voltage 10mA 6.3 VDD Power Supply 5.8 VDD Under Voltage Lockout 5.3 I_VDD Quiet Current VDD=6.1V V 6.1 V V 150 250 uA 185 194 mA Current Sense Section Ipp Primary Peak Current TLEB Lead Edge Blanking 500 ns Shutdown Delay 100 ns Maximum Duty Cycle 50 % 255 us 3.6 us 5 us TDELA Y D_max 176 Feedback Input Section Toff_m Maximum Demagnetization ax time Toff_mi Minimum Demagnetization n time Tdem_ Open loop detection reference OVP Demagnetization time Tcc/Tde Cycle time/demagnetization m time 2 @constant current Power MOSFET Rds_on Power On Resistor BVdss Breakdown Voltage Idss Idrain=50mA 30 Ω 650 V Leakage Current of Power 10 MOS uA Over Temperature Protection T_f T_hys WINSEMI Over temperature protection threshold Over temperature protection hysteresis MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI 160 ℃ 30 ℃ MICROELECTRONICS WINSEMI MICROELECTRONICS 4/8 WS3240 ProductDescription Application Information current of primary side constant, also remains the ratio of WS3240 is a constant current driver for LED lighting, the demagnetization time and the cycle time, which can adopted advanced constant current control method.It realize constant output current, but also independent with integrates 650V power switch. Only need a few peripheral the line input voltage and transformer inductance. The ratio components of the demagnetization time and the cycle time is 0.5: can achieve excellent constant current characteristic. With the primary side feedback technology, Tdem 0.5 Ts WS3240 do not need optocoupler and TL431, also need not the auxiliary winding for power supply and detection. Thus achieve the low system cost. Single Chip Built-in 650V High Voltage Power Supply, Start time less than 100ms Low operation current Fig.1 shows the internal high voltage power supply The operating current of WS3240 is very low. The typical value is 150uA. The low operating current improves the efficiency of the system, while reducing the VDD module. When the system access AC power, VDD capacitor is charged by the internal 650V high voltage MOS. It will not reset and start working until the VDD voltage reaches 5.8V. capacitor requirements. The start time is less than 100ms, which means that the light achieves instant bright. In normal operation, VDD is Primary Feedback PSR Technology Assume that the system works in DCM flyback mode, supply auxiliary Winding. the power transmission equations can be expressed P 2 dynamically charged by Drain, which can save the power 2 Lm I pk f s Vo I o Where, P is the output power, Vo and Io is the system output voltage and current, η is the system power conversion efficiency, Ipk is the primary side peak current, fixed 185mA. In DCM mode, Demagnetization time Tdem can be expressed as: Vo N Tdem s I pk Lm Np Where, Np and Ns is the transformer primary and secondary turns, respectively. Combination of the above two formula, the average output current can be expressed as: Io 2 Io I pk 2 Np Ns I pk WS3240 detects the demagnetization time through the f s Tdem Np Ns drainterminal waveform, which can save auxiliary winding. Cycle by Cycle Current Protection and Lead Tdem Ts Edge Blanking Where Ts is the switch cycle. WS3240 adopts PFM mode to realize constant current, making the peak inductor WINSEMI MICROELECTRONICS Demagnetization Detection WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI Cycle-by-cycle current limiting is offered in WS3240. An internal leading edge blanking circuit chops off the sense MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 5/8 WS3240 ProductDescription voltage spike on the current sense resistor at initial Pin Floating Protection MOSFET on state. The typical value of lead edge blanking is 500ns. The current limit comparator is disabled and thus In WS3240, pin floating phenomenon will not cause damage to the system. cannot turn off the internal MOSFET. Automatic restart protection PFM Control improves the EMI performance In WS3240, protection is locked when a certain WS3240 uses the PFM control method, which can protection is triggered, while the switching stops, intering improve the system performance. Because PFM belongs to restart delay mode. Here the VDD voltage is oscillates frequency conversion control, built-in spread spectrum between 5.3V and 5.8V, and entering into normal start mode function. after 64 cycles. After start up, it works and confirms whether the protection is removed. If the protection is not removed, Over Voltage Protection the chip will enter into protection latch state, and repeat WS3240 has a built-in over voltage protection circuit. delay to restart, until the protection is released. When the LED open, the output voltage increased cycle by cycle, secondary demagnetization time induced. When the Soft Driver of Internal Power MOSFET secondary demagnetization time is less than 5us, the over voltage protection will be triggered. WS3240 has a built-in soft driver, improving the EMI performance, realizing a balance between the efficiency, the reliability and the EMI. Minimum off time WS3240 integrates the minimum off time control, the typical value is 3.6us. It prevents the interference on the chip operation voltage caused by the burrs of the switch off, especially when larger leakage inductance of the transformer and lower output voltage. 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 WS3240 ProductDescription Package Information TO-92 Package Outline Dimensions D E Q1 b L c e 1 2 3 A e Winsemi Dimensions in Millimeters Symbol Dimensions in Inches Min Max Min Max A 3.30 3.90 0.130 0.154 b 0.35 0.55 0.014 0.022 c 0.31 0.51 0.012 0.020 D 4.30 4.90 0.169 0.193 E 4.30 4.90 0.169 0.193 e 1.17 1.37 0.046 0.054 L 12.5 15.5 0.492 0.610 Q1 0.74 0.89 0.029 0.035 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 7/8 WS3240 ProductDescription 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