3232 WS WS3232 WS3232 High PF PSR Constant Current LED Driver Features General Description � ±5% LED Current Accuracy � Primary-side Sensing and Regulation Without WS3232 is a high PF primary-side feedback and regulation controller for LED lighting, optimized for flyback TL431 and Opto-coupler � No Auxiliary Winding For Sensing And Supplying � High Power Factor Correction � QR mode � 600V MOS integrated � Ultra low operating current � LED Open/Short Circuit Protection � CS Resistor Short Circuit Protection � VCC over voltage protection & under voltage converter with the output power less than 30W. Since adopting primary sense and feedback control technology, the secondary sense and feedback circuit is eliminated. And WS3232 does not need the auxiliary winding for sensing the output current and supplying the chip. The low component counts and small system size are realized. Since using the high accurate current sense method, WS3232 realizes ±5% accuracy of LED current along with lockout( UVLO) � excellent line and load regulation. Over Temperature Protection WS3232 offers comprehensive protection including Cycle-by-Cycle current limiting (OCP), LED open/short circuit protection, CS resistor short circuit protection, VCC Applications � GU10 LED driver � LED spot light � Other LED lighting UVLO,OVP and Clamp, and over temperature protection. WS3232 is available in DIP-8 package. Typical Application Circuit NP NS AC 1 VCC GND 8 2 NC GND 7 3 COMP 4 CS D 6 D 5 W/T-D036-Rev.A/0 Dec.2013 Copyright@Winsemi Microelectronics Co., Ltd., All right r eserved. 1213 3232 WS WS3232 Pin Definition and Device Marking WS3232 is available inDIP-8 package: NC 2 c om p 3 CS 4 8 GND WS3232D8P 1 AXB YM VC C WS3232D8P: A: 产品编码 7 GND X:内部代码 6 D B:地域代码 5 D YM:年代码,月代码 Pin Function Description Pin Pin Name Number VCC 1 Power Supply NC 2 NC Comp 3 Loop Compensation CS 4 Current Sense D 5/6 Drain GND 7/8 Ground Pin Type Function Description Power supply. Floating Loop compensation pin. Connect a RC network across this pin and ground to stabilize the control loop. Current sense. This pin connects a current sense resistor to GND to detect the primary current of transformer. Drain of Power MOS Ground. Block Diagram VCC B G &Internal Power Supply OVP OT P D Tons G a te CC&L ogic Control 15V 9 .0 V 1 3 .8 V 0 .8 V OCP L in e Compensation CS sampling UVL O G m 0 .5 V RE SE T 0 C S*3*Tons/T Tons C om p Valley、Tons Detect G a te GND 2/7 Steady, keep you advance 3232 WS WS3232 Ordering Information Package IC Marking Information Purchasing Device Name DIP-8, WS3232D8P WS3232D8P Pb-free Recommended Operating Condition Symbol Parameter Value Unit VCC VCC supply voltage 9~14 V TA Operating temperature -20~85 ℃ Pout Output power <18 W Absolute Maximum Ratings Symbol Parameter Value Unit Icc_max VCC pin maximum sink current 5 mA D Drain of power MOS -0.3~600 V CS CS pin input voltage -0.3~7 V Comp Comp pin input voltage -0.3~7 V TJ Operating junction temperature -40~150 ℃ TSTG Min./Max. Storage temperature -55~150 ℃ Note Note: Stresses above 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 in the Recommended Operating Conditions section are not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. 3/7 Steady, keep you advance 3232 WS WS3232 Electrical Characteristics (TA=25℃,VCC=14V, if not otherwise noted) symbol parameter Test condition Min Typ Max Unit Supply Voltage (VCC) I_VCC_ST Start up current VCC=UVLO_ON-1V 60 100 uA I_OP Operation Current Fop=7Khz 300 400 uA UVLO_ON Turn on threshold Voltage VCC rising 12.7 V UVLO_OFF Turn-off threshold Voltage VCC falling 10 V VCC_Clamp VCC Clamp voltage Icc=5mA 15 V 500 ns Current Sense Section TLEB Leading edge Blanking Time V TH_OC OCP threshold Tdelay Switch off delay time 485 500 515 mV 200 ns Frequency Section Ton_max Max Primary On Time 24 us Toff_max Max Primary Off Time 224 us Power MOS Section Rds_on ON-resistor V GS=10V,ID=1.0A Vds_BD Breakdown voltage ID=250μA 5 600 Ω V Over Temperature Protection Tsd Thermal shutdown threshold 150 ℃ Tsd_hys Thermal shutdown hysteresis 25 ℃ 4/7 Steady, keep you advance 3232 WS WS3232 Function Description WS3232 is a high PF offline QR PSR controller, optimized =(Vcs*Tons/T)*0.5*(Nps/Rcs) for =0.083*(Nps/Rcs) low power primary-side LED driver. WS3232 operates sensing and in regulation. Consequently, Once the parameters of the transformer and the current opto-coupler and TL431 could be eliminated, thus reduce sense resistor Rcs is determined, so is the output current. the cost. And the output current can be set by adjusting the current sense resistor Rcs. Startup Current Internal pre-charge design for quick start up Startup current of WS3232 is designed to as low as 60uA. The VCC capacitor will be charged through the start-up After VCC exceeds UVLO_ON, Vcomp is pre-charged by resistor when the system is powered on. Once the VCC an internal current source. The PWM block will not start to voltage reaches the start-up threshold, the WS3232 will output PWM signals until Vcomp is over 0.45V. Such start to switch. The WS3232 integrates a 15V zener for design is meant to reduce the start up time. The voltage VCC clamping. Due to the ultra-low operating current, the pre-charged Vcomp in start-up procedure can be auxiliary winding is not need to supply the IC. programmed b y, Vcomp=0.4V-300uA*Rcomp Quasi-Resonant Operation Where Rcomp is the series resistor of Comp pin. Quasi-Resonant switching mode is applied in WS3232. Operation switching frequency When the voltage across drain and source of the primary MOSFET is at voltage valley, the MOSFET would be The frequency of WS3232 is decided by load condition turned on, reducing the switching losses and improving and QR mode. When the output power decreases, the EMI performance. switching frequency can become rather high. The maximum switching frequency in WS3232 is internally CC Operation limited to 120Khz. WS3232 is designed to produce good CC control Current Sensing and Leading Edge Blanking characteristic. In DCM mode, the output current Io can be represented b y, Cycle-by-Cycle current limiting is offered in WS3232. The Io=0.5*Ips*Tons/T switch current is detected by a sense resistor into the Where Ips is the peak current of the secondary side; Tons sense pin. An internal leading edge blanking circuit chops is the turn on time of secondary side; T is the switching off the sense voltage spike at initial MOSFET on state due period. to snubber diode reverse recovery so that the external RC Ips=Ipp*Nps=(Vcs/Rcs)*Nps filtering on sense input is no longer required. The current Where Ipp is the primary peak current; Vcs is the voltage limit comparator is disabled and thus cannot turn off the on CS resistor; Rcs is primary current detection resistor; external MOSFET during the blanking period. Nps is the turns ratio of primary to secondary of the flyback transformer. The relationship of Vcs, To ns and T is controlled to be constant by internal circuit, 3*Vcs*Tons/T=0.5V. Thus, Io can be represented b y, Io=0.5*(Vcs/Rcs)*Nps*Tons/T Protection Controls Excellent system stability is achieved by the comprehensive protection of WS3232. Including 5/7 Steady, keep you advance 3232 WS WS3232 Cycle-by-Cycle current limiting (OCP), LED open/short the system will recover to normal operation. circuit protection, CS resistor short circuit protection, VCC The thermal shutdown circuitry in the WS3232 senses the UVLO,OVP and Clamp, over temperature protection, and die temperature after start up, and the thermal protection so on. threshold is set to 150℃ with a 25℃ hysteresis. When the When the LED is open circuit, it will trigger over-voltage temperature on die of WS3232 rises and reaches the protection logic and latch, the system stops switching threshold, the power MOSFET will be shut down immediately; When the LED short circuit is detected, the immediately system works at low frequency(Fop=5Khz), so the power temperature on die falls 25℃ from thermal protection loss is low. At some catastrophic fault condition, such as trigger point. and maintained switch off until the shorted CS resistor or flyback transformer saturation, the internal fast fault detection circuit will trigger and latch, the system stops switching immediately. After the system enters into fault latch condition, the VCC voltage will fall until it reaches UVLO threshold. Then the system will re-start again. If the fault condition is removed, 6/7 Steady, keep you advance 3232 WS WS3232 Package Information DIP-8 Package Outline Dimensions D2 θ2 C1 C C4 θ1 C2 C3 θ3 A2 A5 A1 D1 A3 D A4 B A Winsemi Symbol Dimensions in Millimeters Dimensions in Inches Min Max Min Max A 9.00 9.50 0.354 0.374 B 6.10 6.60 0.240 0.260 C 3.0 3.4 0.118 0.134 A1 1.474 1.574 0.058 0.062 A2 0.41 0.53 0.016 0.021 A3 2.44 2.64 0.096 0.104 A4 0.51TYP 0.02TYP A5 0.99TYP 0.04TYP C1 6.6 C2 7.30 0.260 0.50TYP 0.287 0.02TYP C3 3.00 3.40 0.118 0.134 C4 1.47 1.65 0.058 0.065 D 7.62 9.3 0.300 0.366 D1 0.24 0.32 0.009 0.013 D2 7.62TYP 0.3TYP 7/7 Steady, keep you advance