WS3240 Product Description High Precision PSR LED Constant Current Driver Feature General description Built-in 650V UHV Power MOS WS3240 is a high precision primary side feedback LED Constant Current: ±5% constant current LED driver, suitable for flyback isolated Fixed Primary Peak Current: 185mA Without the Secondary winding Start up time less than 100ms High precision constant current regulation LED in sub 4W power range at universal AC input. It operates in discontinuous current mode. WS3240 integrates 650V power MOS. It operates in primary side sensing and regulation, without a secondary due feedback circuit, also need not the auxiliary transformer to patented CC control winding detection and power supply, only need few Built-in line compensation peripheral components can realize constant current, Ultra low operation current greatly saves the cost and size of the system. Maximum power 4W The start time of WS3240 is less than 100ms at universal LED open/short protection Floating pin protection Excellent EMI performance with PFM control Cycle-by-cycle current limit With patented constant current controlling mode, excellent Built-in leading Edge Blanking linear regulation is achieved. VDD Under Voltage Lockout（UVLO） WS3240 provides a variety of comprehensive protection Built-in over temperature protection mode, AC input with the high voltage start technology, realizing instant bright of the LED lamp. The current precision is less than ± 5% with high precision current sampling circuit and line compensation. including: cycle by cycle current limit 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. Applications LED lighting WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. 1/9 MICROELECTRONICS WT-N051-Rev.A0 Mar.2015 WS3240_EN WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WS3240 Product Description Typical Application Pin Definition and Device Marking WS3240 is offered in TO-92 package, as bellows: WS3240NP：Product name A:product code X:internal code B: area code YM：year code，month code Pin Function Description Pin Name Pin No. Pin Type Drain 1 Drain GND 2 Ground Ground. VDD 3 Power Power Supply. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Function Description The drain terminal of Power MOSFET WINSEMI Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. 2/9 MICROELECTRONICS WT-N051-Rev.A0 Mar.2015 WS3240_EN WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WS3240 Product Description Block Diagram VDD DRAIN 3 1 VCC generator VDD Inter supply UVLO Zero-Current Detect Logic & driver 500mV Line compensation OCP LED Short LED OPEN OTP Peak current detect 2.7Ω 2 GND Ordering Information Package Type IC Marking Information Purchasing Device Name 3-Pin TO-92, Pb-free WS3240NP WS3240NP（TO-92） Recommended Operating Condition symbol parameter value unit Pmax Max Power @Iomax=300mA 4 W TA Operating Temperature -20~85 ℃ WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/9 WS3240 Product Description Absolute Maximum Ratings symbol parameter 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 -40~85 ℃ TSTG Minimun/Maximum storage temperature -55~150 ℃ Note：Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating condition” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 4/9 WS3240 Product Description Electrical Characteristics （TA=25℃, if not otherwise noted） symbol parameter Test condition Min Typ VDD_CLAMP VDD Clamping Voltage 10mA VDD_reg VDD Power Supply 5.8 UVLO_off VDD Under Voltage Lockout 5.3 I_VDD Quiet Current Max Unit Supply Voltage 6.3 VDD=6.1V V 6.1 V V 150 250 uA 185 194 mA Current Sense Ipp Primary Peak Current 176 TLEB Lead Edge Blanking 500 ns TDELAY Shutdown Delay 100 ns D_max Maximum Duty Cycle 50 % 255 us 3.6 us 5 us Feedback Input Maximum Demagnetization Toff_max time Minimum Demagnetization Toff_min time Open loop detection reference Tdem_OVP Demagnetization time Cycle time/ demagnetization Tcc/Tdem 2 time @ constant current Power MOS Rds_on Power On Resistor BVdss Breakdown Voltage Leakage Idrain=50mA 32 650 Current 40 700 Ω V of Idss 10 uA PowerMOS Over Temperature Protection Over temperature protection T_f 160 ℃ 30 ℃ threshold Over temperature protection T_hys hysteresis WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 5/9 WS3240 Product Description Function Description Where Ts is the switch cycle. WS3240 adopts PFM mode to WS3240 is a constant current driver for LED lighting, realize constant current, making the peak inductor current of adopted advanced constant current control method. It primary side constant, also remains the ratio of the integrates 650V power switch. Only need a few peripheral demagnetization time and the cycle time, which can realize components current constant output current, but also independent with the line characteristic. With the primary side feedback technology, input voltage and transformer inductance. The ratio of the WS3240 do not need optocoupler and TL431, also need not demagnetization time and the cycle time is 0.5: can achieve excellent constant Tdem 0.5 Ts the auxiliary winding for power supply and detection. Thus achieve the low system cost. Low operation current Single Chip Built-in 650V High Voltage Power Supply, Start time less than 100ms 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 capacitor requirements. Fig.1 shows the internal high voltage power supply 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. The start Primary Feedback PSR Technology time is less than 100ms, which means that the light achieves instant bright. In normal operation, VDD is dynamically Assume that the system works in DCM flyback mode, the power transmission equations can be expressed as: P charged by Drain, which can save the power supply auxiliary winding. Lm I pk f s Vo I o 2 2 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 Io 2 2 I pk I pk Np Ns Np Ns f s Tdem Fig.1 Demagnetization Detection Tdem Ts WS3240 detects the demagnetization time through the drain WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. 6/9 MICROELECTRONICS WT-N051-Rev.A0 Mar.2015 WS3240_EN WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WS3240 Product Description terminal waveform, which can save auxiliary winding. Minimum off time Cycle by Cycle Current Protection and Lead Edge WS3240 integrates the minimum off time control, the typical Blanking value is 3.6us 。 It prevents the interference on the chip operation voltage caused by the burrs of the switch off, Cycle-by-cycle current limiting is offered in WS3240. An especially when larger leakage inductance of the transformer internal leading edge blanking circuit chops off the sense and lower output voltage. voltage spike on the current sense resistor at initial MOSFET on state. The typical value of lead edge blanking is 500ns. Pin Floating Protection The current limit comparator is disabled and thus cannot turn In WS3240, pin floating phenomenon will not cause damage off the internal MOSFET. to the system. PFM Control improves the EMI performance Automatic restart protection WS3240 uses the PFM control method, which can improve In WS3240, protection is locked when a certain protection is the system performance. Because PFM belongs to triggered, while the switching stops, intering restart delay frequency conversion control, built-in spread spectrum mode. Here the VDD voltage is oscillates between 5.3V and function. 5.8V, and entering into normal start mode after 64 cycles. After start up, it works and confirms whether the protection is removed. If the protection is not removed, the chip will enter Over Voltage Protection into protection latch state, and repeat delay to restart, until the WS3240 has a built-in over voltage protection circuit. When protection is released. 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 WS3240 has a built-in soft driver, improving the EMI voltage protection will be triggered. performance, realizing a balance between the efficiency, the reliability and the EMI. WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 7/9 WS3240 Product Description TO-92 Package Information 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 WINSEMI Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. 8/9 MICROELECTRONICS WT-N051-Rev.A0 Mar.2015 WS3240_EN WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WS3240 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 www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 9/9