WS2585 Product Description WS2585 Low Power Primary Side AC/DC Converter Features General Description ■ Build-in 530V(Vceo) NPN power transistor ■ No-load power Less than100mW converter for battery charger and adapter applications. The WS2585 is a high performance AC/DC power supply ■ Lower start-up current The device uses Pulse Frequency Modulation (PFM) ■ Frequency jittering method to build discontinuous conduction mode (DCM) ■ Build-in Leading Edge Blanking flyback power supplies. The WS2585 provides accurate ■ Cycle by cycle over current protection (OCP) constant voltage and constant current (CC/CV) regulation ■ Under voltage lockout without requiring the opto-coupler and the secondary control ■ ±5% CC、CV Accuracy circuitry. ■ Ultra low standby power (<100mW) It also eliminates the need of loop compensation circuitry while maintaining stability. The WS2585 achieves excellent regulation and high power efficiency, the no-load power consumption is less than 100mW. Applications The WS2585 is available in DIP8 package. ■ Adapters/Chargers for Cell phones, PDAs, MP3 and other portable apparatus ■ LED Driver ■ Standby and Auxiliary power supplies Typical Application Circuit V+ L N V- 1 2 3 4 CPC C FB C GND E VCC CS 8 7 6 5 W/T-D022-Rev.A/1 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 0513 WS2585 Product Description Pin Definition and Device Marking WS2585 is offered in DIP-8 packages，as shown below： CPC VCC 3 4 AX B YM GND 2 W S2585D8P FB 8 C 1 WS2585D8P: A: Product Code 7 C X: Internal Code 6 E B：Area Code YM：Year Month CS 5 Pin Function Description Pin number Pin name 1 CPC 2 3 4 5 6 7 8 FB Function Cable voltage compensation input pin, connects to an external filter capacitor Feedback input GND Ground VCC Power supply CS Current sense input E Emitter of the internal NPN power transistor C Collector of the internal NPN power transistor C Collector of the internal NPN power transistor Block Diagram CPC VCC 1 4 OPC阀值选择 Cable 补 偿 EA R Regulator & B IA S VDD_5V S 7/8 C OC P FB 恒流控制 2 Q CV ZC D p fm To n s Declector p fm DRI V E R TONS 6 Line 补 偿 R 恒流控制 E Q C C S CS 5 RC滤 波 3 OC P OC P 0.5V GND P re-O CP 0.4V OC P阀 值 选 择 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 2/9 WS2585 Product Description Ordering Information Package IC marking information Purchasing device name 8 Pin DIP-8, Pb-free WS2585D8P WS2585D8P Recommended Operating Condition Parameter Value Unit VCC supply voltage 10~30 V Operating temperature -20~85 ℃ Absolute Maximum Ratings Value Unit Supply voltage （VCC） 30 V Feedback voltage （FB） -40~10 V Parameter CS，CPC，OUT Voltage Output current Operating junction temperature Storage temperature Thermal resistance junction-to-ambient -0.3~7 V Internally limited A 150 ℃ -65~150 ℃ 250 ℃/W Note 1 ： Stresses greater than those listed under “Absolute Maximum Rating” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended operating conditions” is not implied. Exposure to “Absolute Maximum Rating” for extended periods may affect device reliability. ESD Information Symbol Parameter Value Unit VESD_HBM Human model 2000 V VESD_MM Machine model 400 V 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 3/9 WS2585 Product Description Electrical Characteristics (VCC=15V,T=25℃.( unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit Start-up section Start-up threshold Vstu 17.8 19.4 21 V UVLO threshold Vlo 6 7.5 8.5 V Start-up current Istart VCC=Vstu-0.5V 4 6 uA Operating current IVCC Static 500 700 uA Isourceh Vout=2V 24.5 30 35.5 mA Isoutcel Vout=2V 0.3 1.4 1.8 mA Vocp 485 500 515 mV Vocp80% 380 400 420 mV Drive output section Output current Output current， Vcs>Vocp80% Current sense section CS compare threshold 80%CS compare threshold Leading edge blanking Tleb 500 ns Vs&href 4 V Feedback section Feedback threshold voltage Transistor section Collector-Emitter Voltage Vceo IOC=1mA Vce (SAT) Ioc=600mA 1 V Output rising time Tr CL=1nF 75 ns Output falling time Tf CL=1nF 75 ns Collector-Emitter Saturation Voltage maximum Collector current WIN SEM I M ICROELECTRON ICS www.winsemi.com Icm WIN SEM I 600 M ICROELECTRON ICS Tel : +86-755-8250 6288 530 WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I V 650 M ICROELECTRON ICS mA WIN SEM I M ICROELECTRON ICS 4/9 WS2585 Product Description Typical Operating Characteristics Vstart VS Temp Vstart( V) 1 8 .6 5 Vstop(V) 7 .5 0 1 8 .6 0 7 .4 5 1 8 .5 5 7 .4 0 1 8 .5 0 7 .3 5 1 8 .4 5 7 .3 0 1 8 .4 0 7 .2 5 1 8 .3 5 7 .2 0 -4 0 0 40 80 120 -4 0 Vstop Vs Temp 0 Temp(°C) Ist V S Tem p Ist(µA) 4 .2 Iop(µA) 80 120 80 120 lop V S Tem p 700 630 560 490 3 .6 3 .0 420 350 2 .4 1 .8 280 210 140 1 .2 0 .6 70 0 0 -4 0 0 40 80 120 -4 0 M ICROELECTRON ICS www.winsemi.com WIN SEM I M ICROELECTRON ICS Tel : +86-755-8250 6288 0 40 Temp(°C) Temp(°C) WIN SEM I 40 Temp(°C) WIN SEM I M ICROELECTRON ICS Fax : +86-755-8250 6299 WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 5/9 WS2585 Product Description Function Description Start-up and UVLO Vaux Vs = Naux Ns At the phase of power-on, the rectified high voltage DC Vs = Vo + Vd charges the capacitor of VP through the start-up resistor. So, Vaux = Naux ⋅ (Vo + Vd ) When VP rises to 19.4V, the IC enters normal operation, Ns then switching begins and the output voltage begins to rise. The VP bypass capacitor must supply the IC until the output voltage builds up enough to provide power from the auxiliary Vaux = Vu * (1 + R2 ) R3 Where Vd is the diode forward drop voltage. winding to sustain the VP. The under-voltage threshold of VP is 7.5V, and therefore, the voltage on the VP capacitor must not drop more than 7V while the output is charging up. Constant Primary Peak Current The primary current ip(t) is sensed by a current sense resistor Rcs, the current rises up linearly at a rate of: dip(t ) Vg (t ) = dt Lm （1） Auxiliary voltage waveform The output voltage is different from the secondary voltage in a diode forward drop voltage that depends on the current. If the secondary voltage is always detected at a fixed secondary current, the difference between the output Primary current waveform voltage and the secondary voltage will be a fixed Vd. The As illustrated in top figure，when the current ip(t) rises up to voltage detection point is at two-thirds of the D1 on-time. Ipk, the switch turns off. The constant peak current is given The CV loop control function of WS2585 then generates a by: D1 off-time to regulate the output voltage. Ipk = Vcs Rcs （2） Constant Current Operation The energy stored in the magnetizing inductance Lm each cycle is : Eg = 1 × Lm × Ipk 2 2 （3） So the power transferring from the input to the output is given by: P= 1 × Lm × Ipk 2 × f sw 2 Where f sw （4） Secondary current waveform is the switching frequency. When the peak current Ipk is constant, the output power depends on the switching frequency In CC operation, the CC loop control function of WS2585 will keep a fixed proportion between D1 on-time Tons and f sw . D1 off-time Toffs by discharging or charging the capacitance. The fixed proportion is: Constant Voltage Operation The WS2585 captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) secondary winding is master, the auxiliary winding is slave Tons 4 = Toffs 3 during the D1 on-time. The auxiliary voltage is given by: The relationship between the output constant-current Iout mode to regulate the output voltage. Assuming the and secondary peak current Ipks is given by: 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 6/9 WS2585 Product Description Iout = 1 Tons × Ipks × 2 Tons + Toffs WS2585 build-in line voltage compensation to achieve great system CC accuracy in 90-264VAC range. Thus the higher At the instant of D1 turn-on, the primary current transfers to the line voltage, the lower the OCP threshold. By changing the secondary at an amplitude of: the resistance of R6, the amount of compensation can be Ipks = Np × Ipk Ns set to achieve better line compensation effect. Leading Edge Blanking Thus the output constant-current is given by: Iout = 1 Np Tons 2 Np × × Ipk × = × × Ipk 2 Ns Tons + Toffs 7 Ns When the power switch is turned on, a turn-on spike will occur on the sense-resistor. To avoid false-termination of the switching pulse, a 430ns leading-edge blanking is built in. Cable Compensation During this blanking period, the current sense comparator is WS2585 detects the duty cycle (Tons/T) of the secondary disabled and the gate driver can not be switched off. side using RC filter, which the filtering resistance is built-in; the filter capacitor connects to CPC pin. The larger the CCM Protection Tons/Tm， the lager the voltage on CPC pin, which means The WS2585 is designed to operate in discontinuous the greater the load, the IC drags more current from FB pin, conduction mode (DCM) in both CV and CC modes. To thus through the feedback loop, the output voltage would be avoid operating in continuous conduction mode (CCM), the higher. WS2585 detects the falling edge of the FB input voltage on each cycle. If a 0.1V falling edge of FB is not detected, the Line Compensation WIN SEM I WS2585 will stop switching. 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 7/9 WS2585 Product Description DIP -8 Package Information 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 8/9 WS2585 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:Room 1002, East, Phase 2, HighTech Plaza,Tian-An Cyber Park,Chegongmiao, FuTian, Shenzhen, P.R. China 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 9/9