WS2284 Product Description Current Mode PWM Controller Features start-up current and operating current, that is, at the � Burst Mode Control condition of no load or light load, WS2284 can reduce the � 5uA ultra-low startup current switch frequency linearly which minimize the switching � 1.8mA Low operating current power loss; the ultra-low startup current and operating � Built-in Leading-edge blanking current make a reliable power for startup design, and also � Built-in synchronous slope compensation circuit large resistor can be used in the startup circuit to improve � Built-in Soft-Start switching efficiency. The internal synchronous slope � 65kHz fixed switch frequency compensation circuit reduces the possible sub harmonic � Cycle by cycle over current protection (OCP) oscillation at high PWM duty cycle output. � VDD over voltage clamp & under voltage Leading-edge blanking on current sense(CS) input lockout( UVLO) removes the signal glitch due to snubber diode circuit � Over load protection (OLP) reverse recovery and thus greatly reduces the external � OVP shut down latch component count and system cost in the design. � Maximum Gate output voltage clamped at 12V WS2284 offers comprehensive protection coverage with � Frequency jittering automatic self-recovery feature, including cycle by cycle � Ultra low standby power (<100mW) over current protection (OCP), over load protection (OLP), VCC Clamp, under voltage lockout (UVLO), OTP and Applications OVP shut down latch. The gate-driven output is clamped Universal switch power supply equipment and offline to maximum 12V to protect the internal MOSFET. AC/DC flyback power converter Excellent EMI performance is achieved by using the � Power Adapter soft-switching � Set-Top Box Power Supplies totem-pole-gate-drive output. The tone energy at below � Open-frame SMPS 20KHZ is minimized in the design and audio noise is � Battery Charger eliminated during operation. The WS2284 is the ideal and frequency jittering at the substitute of the linear power supply or the RCC-mode General Description power, for a better performance of the whole switch power WS2284 is a high performance current mode PWM system and a lower cost. controller, optimized for low power switch equipment. WS2284 is available in SOP8 and DIP8 package. For lower the standby power and higher RoHS compliant, the IC offers a Burst Mode control feature and ultra-low W/T-D016-Rev.A/2 May.2014 WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS 0612 WS2284 Product Description Typical Application Circuit V+ L EMI Filter N V- 1 2 3 4 N C GND VDD GND 8 7 FB D R A IN 6 CS D R A IN 5 Output Power Table 230VAC±15% 85-265VAC Adapter1 Adapter1 8W 5W Product WS2284 Note Note: Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at 50℃ ambient. Pin Definition and Device Marking WS2284 is available in SOP8 and DIP8 package: NC VDD FB CS 1 8 2 7 3 D IP 8 4 6 GND GND WS2284D8P A1a 2C D r a in 5 D: DIP8 S: SOP8 P: no PbA A:wafer information; D r a in 1:Ver.; a: Package Code 2C:Y+M(2=2012 C=12 Month NC VDD FB CS (1,2…A=10,B=11,C=12) 1 8 2 7 3 SOP8 4 6 GND GND WS2284S8P A1a 2C D r a in 5 D r a in 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 2/11 WS2284 Product Description Pin Function Description Pin Pin Name Number NC 1 NC VDD 2 Power FB 3 Feedback Input CS 4 DRIAN 5/6 GND 7/8 Pin Type Function Description Floating pin Power supply Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at Pin 4. The internal protection circuit will automatically shutdown when the FB voltage level exceeds a preset threshold voltage. Current Monitoring Power transistor drain Current sense input. This pin connects directly to the primary lead of the transformer and is capable of switching a maximum of 600V GND Ground Block Diagram GND OSC Trigger and L o g ic VDD Clamper Driver Output Soft switch Control Soft start OCP Comp VDD D R A IN PWM Comparator CS LEB Slope Comp UVLO Vo lta g e Divider OLP Internal su p p ly FB Burst Mode Ordering Information WIN SEM I Package IC Marking Information Purchasing Device Name 8-SOP8, Pb-free WS2284S8P WS2284S8P 8-DIP8, Pb-free WS2284D8P WS2284D8P 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 3/11 WS2284 Product Description Recommended Operating Condition Symbol Parameter Value Unit VCC VCC supply voltage 10~30 V TA Operating temperature -20~85 ℃ Absolute Maximum Ratings Symbol Parameter Value Unit Drain voltage(off-state) Drain Input Voltage -0.3~600 V VDD DC supply voltage 30 V VFB FB input voltage -0.3~7 V VCS CS input voltage -0.3~7 V TJ Operating junction temperature -20~150 ℃ TSTG Storage temperature -40~150 ℃ VCV VDD clamp voltage 32 V ICC VDD DC clamp current 10 mA 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. ESD Information Symbol Parameter Value Unit VESD_HBM Human model 3000 V VESD_MM Machine model 300 V Electrical Characteristics(VDD=16V,TA=25℃if not otherwise noted) Supply Voltage (VCC) symbol parameter Test condition VCC_OP UVLO_ON UVLO_OFF I_VCC_ST I_VCC_OP Vpull_up VDD_Clamp Operation voltage Turn on threshold Voltage Turn-off threshold Voltage Start up current Operation Current Pull-up PMOS active VDD Zener Clamp Voltage OVP(ON) Over voltage protection voltage Vlatch_release Latch release voltage Min Typ Max Unit 6.5 12.5 7.5 13.5 5 30 8.5 14.5 20 3.0 V V V uA mA VCC=13V VFB=3V IVDD=10mA CS=0.3V,FB=3V, Ramp up VCC until gate clock is off 30 13 32 34 V 26 28 30 V 5 V Feedback Input Section VFB_Open Avcs Vref_green Vref_burst_H Vref_burst_L IFB_Short VFB Open Loop Voltage PWM input gain ΔVfb/ΔVcs The threshold enter green mode The threshold exit burst mode The threshold enter burst mode FB Pin Short Current VTH_PL Power limiting FB Threshold WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I 3.9 5.0 2 2.1 1.3 1.2 FB Shorted to GND 0.32 0.48 3.7 M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I V V/V V V V mA V M ICROELECTRON ICS 4/11 WS2284 Product Description TD_PL ZFB_IN Max_Duty Power limiting Debounce Input Impedance Maximum duty cycle 80 75 88 16 80 96 85 ms kΩ % Current CS Section SST TLEB ZCS TD_OC VTH_OC Vocp_clamping Soft Start time Leading edge Blanking Time Input impedance OCP control delay OCP threshold 4 220 40 120 0.75 0.9 FB=3V ms ns kΩ ns V V Oscillator Section Fosc Normal Oscillation Frequency Fosc_BM Burst mode frequency Frequency variation temp. Deviation Frequency variation versus VDD Shuffling Frequency Frequency Jittering ∆f_temp ∆f_VDD F_shuffling ∆f_OSC VCC=14V,FB=3V, CS=0.3V versus 57 65 71 khz 22 khz TEMP = -20 to 85℃ 1 % VDD = 12 to 25V 1 % 32 ±4 Hz % MOSFET Section MOSFET Drain-Source breakdown voltage Static Drain to Source on resistance BVdss Ron WIN SEM I M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 600 V 12 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I 15 Ω M ICROELECTRON ICS 5/11 WS2284 Product Description Typical Operating Characteristics 。 Vth_otp(V)vs Temperatur( C) 5 .0 1 .0 2 4 .5 1 .0 1 V t h_ ot p(V ) Istartup(uA) Istartup(uA) vs Temperature ( 。 C ) 4 .0 3 .5 1 .0 0 0 .9 9 3 .0 0 .9 8 -4 0 0 80 40 120 -4 0 。 Temperature ( C ) 1 3 .8 0 UVLO(OFF)(V) UVLO(ON)(V) 120 UVLO(OFF)(V) vs Temperature( 。 C ) 8 .5 0 8 .3 0 8 .1 0 7 .9 0 1 3 .6 0 1 3 .4 0 1 3 .2 0 1 3 .0 0 7 .7 0 -4 0 0 40 80 120 -4 0 0 40 80 120 。 Temperature( C ) 。 Temperature( C ) 。 Fose(KHz)vs Temperature( C ) V th _ O C ( V ) v s d u ty ( % ) 0 .9 5 6 4 .0 0 .9 0 6 3 .8 Fo s e(K H z ) Vth_OC(V) 80 40 。 Temperatur( C) UVLO(ON)(V)vs Temperature( 。 C ) 0 .8 5 0 .8 0 6 3 .5 6 3 .3 6 3 .0 0 .7 5 0 14 28 42 56 70 -4 0 D u ty ( % ) WIN SEM I 0 M ICROELECTRON ICS www.winsemi.com WIN SEM I 40 80 120 。 Temperature( C ) M ICROELECTRON ICS Tel : +86-755-8250 6288 0 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 6/11 WS2284 Product Description Function Description For the burst mode control circuit, WS2284 self adjusts the WS2284 is a high performance current mode PWM switching mode according to the loading condition. At the controller, optimized for low power AC/DC application. Ultra condition of no load or light/medium load, the FB input low startup current and operating current together with burst voltage drops below burst mode threshold level. Device mode feature minimize the standby power consumption and enters Burst Mode control on the basis of the judgment. The improve the switching efficiency. In addition to reduce the gate drive output switches only when VCC voltage drops external component count, the internal synchronous slope below a preset level and FB input is active. Otherwise the compensation combines with the leading-edge blanking gate drive remains at off to minimize the switching loss and improves system large stability and reduces the possible power consumption to the greatest extend. The frequency sub harmonic oscillation. WS2284 also have multiform control also eliminates the audio noise at any loading general recovery protection mode. The main function is conditions. described as below: Oscillator Operation Startup Current and Startup Control The switching frequency is internally fixed at 65kHz. No Startup current of WS2284 is designed to be extremely low external frequency setting components are required for PCB at 5uA, so that VCC could be charged up above UVLO design simplification. threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power Current Sensing and Leading Edge Blanking loss, predigest the design of startup circuit and provides Cycle-by-Cycle current limiting is offered in WS2284. The reliable startup in application. For the design of AC/DC switch current is detected by a sense resistor into the sense adaptor with universal input range, a startup resistor of 2 MΩ, pin. An internal leading edge blanking circuit chops off the 1/8 W could be used together with a VCC capacitor to sense voltage spike at initial MOSFET on state due to provide a fast startup and low power dissipation solution. snubber diode reverse recovery so that the external RC filtering on sense input is no longer required. The current Operating Current limit comparator is disabled and thus cannot turn off the The operating current of WS2284 is low at 1.8mA. Excellent internal MOSFET during the blanking period. PWM duty efficiency is achieved with low operating current together cycle is determined by the current sense input voltage and and extended burst mode control circuit. the FB input voltage. Soft Start Internal Synchronized Slope Compensation WS2284 features an internal 4ms soft start to soften the Built-in slope compensation circuit adds slope voltage onto electrical stress occurring in the power supply during startup. the current sense input voltage for PWM generation. This It is activated during the power on sequence. As soon as greatly enhances the close loop stability at CCM and VCC reaches UVLO ( OFF ), the CS peak voltage is prevents possible sub harmonic oscillation and thus reduces gradually increased from 0.15V to the maximum level. Every the output ripple voltage. restart up is followed by a soft start. Gate Drive Extended Burst Mode Operation The gate drive strength which is too weak leads to over At zero load or light load, most of the power dissipation of switch loss of MOSFET while too strong gate drive output the switching power supply comes from the MOSFET compromises in the over EMI. A good tradeoff between switching loss, the core loss of the transformer and the loss output strength and dead time control is achieved through on the snubber circuit. The magnitude of power loss is in the design of the built-in totem pole gate. The low standby proportion to the number of switching events within a period dissipation and good EMI system design is easier to achieve of time. Therefore reducing the switch event leads to through this dedicated devise. For MOSFET gate protection, reduction on the power loss and thus saving the energy. an internal 12V clamp is added at higher than expected VCC W/T-D016-Rev.A/2 May.2014 WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS 0612 WS2284 Product Description input. condition when FB input voltage exceeds power limit threshold value for more than TD_PL, control circuit reacts Protection Controls to shut down the output power MOSFET. Device restarts Excellent system stability is achieved by the comprehensive when VCC voltage drops below UVLO limit. It is clamped protection of WS2284. Including Cycle-by-Cycle current when VCC is higher than threshold value. The power limiting (OCP), Over Load Protection (OLP) and over MOSFET is shut down when VCC drops below UVLO limit voltage clamp, VCC Clamp, Under Voltage Lockout on VCC and device enters power on start-up sequence thereafter. (UVLO), OTP and OVP shut down latch. At overload 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 8/11 WS2284 Product Description Package Information DIP8 Package Outline Dimensions D2 θ1 C1 C C4 θ2 C2 C3 θ3 D1 A2 A5 A3 A1 D A4 B A Winsemi Dimensions in Millimeters Symbol 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 WIN SEM I 7.62TYP M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I 0.3TYP M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 9/11 WS2284 Product Description SOP-8 Package Dimension B2 A1 A2 0 . 5 * 0.125± 0. 05 球形标记 D D1 B B1 A C4 A3 R2 C C1 θ4 θ2 C2 R1 θ1 C3 θ3 Winsemi Dimensions in Millimeters Symbol Dimensions in Inches Min Max Min Max A 4.70 5.10 0.185 0.201 B 3.70 4.10 0.146 0.161 C 1.30 1.50 0.051 0.059 A1 0.35 0.48 0.014 0.019 A2 1.27TYP 0.05TYP A3 0.345TYP 0.014TYP B1 5.80 B2 6.20 0.228 5.00TYP 0.244 0.197TYP C1 0.55 0.70 0.022 0.028 C2 0.55 0.70 0.022 0.028 C3 0.05 0.225 0.002 0.009 C4 0.203TYP 0.008TYP D 1.05TYP 0.041TYP D1 WIN SEM I 0.40 M ICROELECTRON ICS www.winsemi.com WIN SEM I 0.80 M ICROELECTRON ICS Tel : +86-755-8250 6288 WIN SEM I 0.016 M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS 0.031 WIN SEM I M ICROELECTRON ICS 10/11 WS2284 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 11/11