WS3240 ProductDescription

Transcription

1 High Preciion PSR LED Contant Current Driver Feature Built-in 650V UHV Power MOS LED Contant Current: ±5% Fixed Primary Peak Current: 185mA Without the Secondary winding Start up time le than 100m High preciion contant current regulation due to patented CC control Built-in line compenation Ultra low operation current Maximum power 4W LED open/hort protection Floating pin protection Excellent EMI performance with PFM control Cycle-by-cycle current limit Built-in leading Edge Blanking VDD Under Voltage Lockout(UVLO) Built-in over temperature protection Application LED lighting Decription WS3240 i a high preciion primary ide feedback contant current LED driver, uitable for flyback iolated LED in ub 4W power range at univeral AC input. It operate in dicontinuou current mode. WS3240 integrate 650V power MOS. It operate in primary ide ening and regulation, without a econdary feedback circuit, alo need not the auxiliary tranformer winding detection and power upply, only need few peripheral component can realize contant current, greatly ave the cot and ize of the ytem. The tart time of WS3240 i le than 100m at univeral AC input with the high voltage tart technology, realizing intant bright of the LED lamp. The current preciion i le than ± 5% with high preciion current ampling circuit and line compenation. With patented contant current controlling mode, excellent linear regulation i achieved. WS3240 provide a variety of comprehenive protection mode, including: cycle by cycle current limit protection(ocp), LED open/hort circuit protection, under voltage protection and clamping, over temperature protection, pin floating protection etc.. WS3240 i offered in TO-92 package. Copyright@Winemi Microelectronic Co., Ltd., All right reerved. 1201

2 Typical Application Pin Configuration and Marking Information WS3240 i offered in TO-92 package, a bellow: WS3240P A:Product Code X:Internal Code BCY:Internal Code For QC YMX:D/C Pin Definition Pin ame Pin o. Pin Type Function Decription Drain 1 Drain The drain terminal of Power MOSFET GD 2 Ground Ground. VDD 3 Power Power Supply. Tel : Fax : /8

3 Internal Block Diagram Ordering Information Package Marking Part umber 3-Pin TO-92, Pb-free WS3240P WS3240P Recommended Operation Condition Part umber Package Input voltage Maximum output power WS3240P TO VAC-264VAC 4 W 90VAC-264VAC 3 W Abolute Maximum Rating ymbol paramete limite 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 torage temperature -55~150 ote : Stree beyond thoe lited under abolute maximum rating may caue permanent damage to the device. Tel : Fax : /8

4 Electrical Characteritic (Unle otherwie pecified, VCC=8V and TA =25 ) Symbol Parameter Condition Min Typ Max Unit Supply Voltage Section VDD_C LAMP VDD Clamping Voltage 10mA 6.3 V VDD_re g VDD Power Supply V UVLO_ off VDD Under Voltage Lockout 5.3 V I_VDD Quiet Current VDD=6.1V ua Current Sene Section Ipp Primary Peak Current ma TLEB Lead Edge Blanking 500 n TDELA Y Shutdown Delay 100 n D_max Maximum Duty Cycle 50 % Feedback Input Section Toff_m Maximum Demagnetization 255 u ax time Toff_mi Minimum Demagnetization 3.6 u n time 5 u Tcc/Tde Cycle time/demagnetization 2 m current Power MOSFET Rd_on Power On Reitor Idrain=50mA 30 Ω BVd Breakdown Voltage 650 V Tdem_ Open loop detection reference OVP Demagnetization time Id Leakage Current of Power MOS Over Temperature Protection T_f Over temperature protection threhold T_hy Over temperature protection hyterei 10 ua Tel : Fax : /8

5 Application Information WS3240 i a contant current driver for LED lighting, adopted advanced contant current control method.it integrate 650V power witch. Only need a few peripheral component can achieve excellent contant current characteritic. With the primary ide feedback technology, WS3240 do not need optocoupler and TL431, alo need not the auxiliary winding for power upply and detection. Thu achieve the low ytemcot. Low operation current The operating current of WS3240 i very low. The typical value i 150uA. The low operating current improve the efficiency of the ytem, while reducing the VDD capacitor requirement. Primary Feedback PSR Technology Aume that the ytem work in DCM flyback mode, the power tranmiion equation can be expreed 2 P Lm I pk f Vo I o 2 Where, P i the output power, Vo and Io i the ytem current of primary ide contant, alo remain the ratio of the demagnetization time and the cycle time, which can realize contant output current, but alo independent with the line input voltage and tranformer inductance. The ratio of the demagnetization time and the cycle time i 0.5: T dem T 0.5 Single Chip Built-in 650V High Voltage Power Supply, Start time le than 100m Fig.1 how the internal high voltage power upply module. When the ytem acce AC power, VDD capacitor i charged by the internal 650V high voltage MOS. It will not reet and tart working until the VDD voltage reache 5.8V. The tart time i le than 100m, which mean that the light achieve intant bright. In normal operation, VDD i dynamically charged by Drain, which can ave the power upply auxiliary Winding. output voltage and current, η i the ytem power converion efficiency, Ipk i the primary ide peak current, fixed 185mA. In DCM mode, Demagnetization time Tdem can be expreed a: V L o m T dem p I pk Where, p and i the tranformer primary and econdary turn, repectively. Combination of the above two formula, the average output current can be expreed a: I o I I 2 o pk I 2 pk p f p T T T Where T i the witch cycle. WS3240 adopt PFM mode to realize contant current, making the peak inductor dem dem Demagnetization Detection WS3240 detect the demagnetization time through the drainterminal waveform, which can ave auxiliary winding. Cycle by Cycle Current Protection and Lead Edge Blanking Cycle-by-cycle current limiting i offered in WS3240. An internal leading edge blanking circuit chop off the ene Tel : Fax : /8

6 voltage pike on the current ene reitor at initial MOSFET on tate. The typical value of lead edge blanking i 500n. The current limit comparator i diabled and thu cannot turn off the internal MOSFET. PFM Control improve the EMI performance WS3240 ue the PFM control method, which can improve the ytem performance. Becaue PFM belong to frequency converion control, built-in pread pectrum function. Over Voltage Protection WS3240 ha a built-in over voltage protection circuit. When the LED open, the output voltage increaed cycle by cycle, econdary demagnetization time induced. When the econdary demagnetization time i le than 5u, the over voltage protection will be triggered. Minimum off time WS3240 integrate the minimum off time control, the Pin Floating Protection In WS3240, pin floating phenomenon will not caue damage to the ytem. Automatic retart protection In WS3240, protection i locked when a certain protection i triggered, while the witching top, intering retart delay mode. Here the VDD voltage i ocillate between 5.3V and 5.8V, and entering into normal tart mode after 64 cycle. After tart up, it work and confirm whether the protection i removed. If the protection i not removed, the chip will enter into protection latch tate, and repeat delay to retart, until the protection i releaed. Soft Driver of Internal Power MOSFET WS3240 ha a built-in oft driver, improving the EMI performance, realizing a balance between the efficiency, the reliability and the EMI. typical value i 3.6u. It prevent the interference on the chip operation voltage caued by the burr of the witch off, epecially when larger leakage inductance of the tranformer and lower output voltage. Tel : Fax : /8

7 Package Information TO-92 Package Outline Dimenion E D Q1 b c L e e A Winemi Symbol Dimenion in Millimeter Dimenion in Inche Min Max Min Max A b c D E e L Q Tel : Fax : /8

8 OTE: 1.We trongly recommend cutomer check carefully on the trademark when buying our product, if there i any quetion, pleae don't be heitate to contact u. 2.Pleae do not exceed the abolute maximum rating of the device when circuit deigning. 3.Winemi Microelectronic Co., Ltd reerved the right to make change in thi pecification heet and i ubject to change without prior notice. COTACT: Winemi Microelectronic Co., Ltd. ADD:Futian Ditrict, ShenZhen Tian An Cyber Tech Plaza two Eat Wing 1002 Pot Code : Tel : FAX : Web Site : Tel : Fax : /8