WS2596B Product Description WS2596B High Efficiency Charger Control IC Features Description Standby power<75mw Low stat-up current,<1uA controller for battery charger and adapter applications.The High efficiency(Meet Energy Star 6.0) device uses Pulse Frequency Modulation (PFM) method to Internal random Frequency jitter to Reduce System EMI build discontinuous conduction mode (DCM)flyback power Internal leading edge blanking supplies. Cycle by cycle current limit VCC UVLO and Over Voltage Protection ±5% CC、CV accuracy Good dynamic transient(10%--any load) WS2596B can achieve excellent regulation and high average CS pin and CS resistor Open/Short protection efficiency(meet Energy star 6.0), yet meets standby power FB Upper/Lower resistor Open/Short protection less than 75mW. IC GND open protection Output over voltage protection Output under voltage protection Over temperature protection Intelligent temperature regulation (When the WS2596B is a high performance AC/DC power supply WS2596B provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and the secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining good stability. WS2596B has compensation a function. proprietary Internal cable voltage random drop frequency modulation to reduce system EMI. WS2596B is available in SOP-7 package. temperature over 133℃，the output power will be reduced.) Secondary SBD short protection Transformer saturation protection CS double peak threshold，suppress audio noise Slope drive technology，reduce driving loss External proprietary adjustable cable voltage drop Compensation Internal proprietary adjustable line compensation for CC Variation Internal BJT SOP-7 package Typical Appliction Adapters/Chargers for Cell/cordless Phones, PDAs, MP3 and Other Portable Devices LED driver WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS A2 0318 WS2596B Product Description Typical Application Circuit Pin Definition and Device Marking WS2596B is available in SOP-7 package： WS2596BS7P：Product Code A：Product Code X：Internal Code BCY：Internal QC Code YMX：D/C SOP7 Package Pin Definition Pin name Pin No. Description FB 1 Feedback input CS 2 Current sense input VCC 3 IC Supply Voltage input E 4 Emitter of internal BJT C 5/6 Collector of internal BJT GND 7 IC Ground WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 2/9 WS2596B Product Description Block Diagram Ordering Information Package Marking Part Number 7-Pin SOP-7,Pb-free WS2596BS7P WS2596BS7P Parameter Value Unit Supply Voltage （VCC） 7~18 V Operating temperature -20~85 ℃ Recommended Operating Condition Absolute Maximum Ratings Parameter Limit Unit Supply Voltage（VCC） 30 V FB pin voltage （FB） -40~10 V Other pins voltage （CS，E，OUT） -0.3~7 V OUT pin output current Internal limited A Maximum junction temperature 150 ℃ Storage temperature range -65~150 ℃ Thermal resistance junction to ambient 250 ℃/W VCBO 700 V VCEO 450 V ICM 400 mA Note 1：Stresses beyond those listed under “ absolute maximum ratings” may cause permanent damage to the device. Under “ recommended operating conditions” the device operation is assured, but some particular parameter may not be achieved. 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 WS2596B Product Description ESD Parameter Symbol Parameter Value Unit VESD_HBM Human Body Model 2000 V VESD_MM Machine Model 200 V Electrical Characteristics Conditions：VCC=15V,T=25℃.( unless otherwise specified) Parameter Symbol Condition Min. Typ. Max. Unit Start-up section Start-up voltage threshold UVLO_on 14 16.3 18 V UVLO threshold UVLO_off 3.4 4.2 5 V VCCOVP threshold VCC_OVP 18.7 V VCC Clamp VCC_clamp 18.1 V VCC Clamp current I_clamp 5 mA Start-up current Istart VCC=Vstu-0.5V 0.2 Operating current IVCC Static 500 Output source current Isourceh CS=0.4V Output source current Isourceh CS=0V 10 mA Isourcel Vout=2V 2.1 mA Isink VCC=15V OUT=1V 250 mA 3 uA uA Driver section Output source current， Vcs>Vocp80% Sink current 34 40 46 mA Current Sense section CS comparator threshold Vocp 80%CS comparator threshold Vocp80% CS comparator threshold Vocp 80%CS comparator threshold Vocp80% Load>40% 480 500 520 mV 430 mV 330 mV 280 mV FOCP 1.5 V Leading Edge Blanking time Tleb 800 ns Maximum Off time Toff_max 18 ms Schottky barrier diode short protection threshold Load<30% Feedback Section Feedback threshold voltage Vs&href Output OVP FB_OVP Output OVP delay time TD_OVP Output UVP 3.94 4 4.06 V 6 V 6 CLK FB_UVP 2.4 V Output UVP delay time TD_UVP 64 ms Abnormal protection FB_abnor -1.2 V FB input resistance Z_FB 1.5 MΩ - V Remain 6 cycles Vfb@switch on Power switch section BJT Breakdown voltage IOC=1mA IOC=1mA 700 BJT saturation voltage Ioc=300mA Ioc=300mA - Maximum collector current WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI 350 MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS 1 V 400 mA WINSEMI MICROELECTRONICS 4/9 WS2596B Product Description Thermal section Intelligent thermal control Output power start to Tz threshold OTP threshold reduce Totp Restart P Function Description 133 ℃ 150 ℃ 1 Lm Ipk 2 f sw 2 （4） Where fsw is the switching frequency. When the Start-up and UVLO At the phase of power-on, the rectified high voltage DC charges the capacitor of VCC through the start-up resistor. When VCC rises to 16.3V, the IC enters normal operation, then switching begins and the output voltage begins to rise. The VCC bypass capacitor must supply the IC until the output voltage builds up enough to provide power from the auxiliary winding to sustain the VCC. The under-voltage threshold of VCC is 4.2V, the control circuit will turn off the output, then the Vcc capacitor will be charged again. Constant primary peak current The primary current ip(t) is sensed by a current sense Lm is primary the switching frequency fsw. Constant Voltage Operation The WS2596B captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to regulate the output voltage. Assuming the secondary winding is master, the auxiliary winding is slave during the D1 on-time. The auxiliary voltage is given by: Vaux Vs Naux Ns And Vs Vo Vd So resistor Rcs, the current rises up linearly at a rate of: dip (t ) Vg (t ) dt Lm peak current Ipk is constant, the output power depends on Vaux Naux (Vo Vd ) , Ns inductance . （1） Where Vd is the diode forward drop voltage. So the output will be constant when the VFB is constant to 4V. Primary current waveform As illustrated in top figure，when the current ip(t) rises up to Ipk, the switch turns off. The constant peak current is given by: Vcs Ipk Rcs Auxiliary voltage waveform ， Vcs is internal limited to 0.5V diode forward drop voltage that depends on the current. If the （2） The energy stored in the magnetizing inductance Lm each cycle is : Eg The output voltage is different from the secondary voltage in a secondary voltage is always detected at a fixed secondary current, the difference between the output voltage and the secondary voltage will be a fixed Vd. The voltage detection 1 Lm Ipk 2 2 point is at two-thirds of the D1 on-time. The CV loop control （3） So the power transferring from the input to the output is given function of WS2596B then generates a D1 off-time to regulate the output voltage. by: 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 WS2596B Product Description Constant Current Operation WS2596B detects the falling edge of the FB input voltage on each cycle. If a 0.1V falling edge of FB is not detected, the WS2596B will stop switching. VCC Over Voltage Protection and Clamp When the VCC voltage reaches 17.9V, WS2596B will start a 5mA clamp current inside, make the VCC voltage is not up, Secondary current waveform avoid error VCC_OVP when VCC is changed by load In CC operation, the CC loop control function of WS2596B changing which caused by large leakage inductance and other will keep a fixed proportion between D1 on-time Tons and factors. When the output voltage is too high, the auxiliary D1 off-time Toffs by discharging or charging the capacitance. The fixed proportion is： the chip will stop the output pulse, enter the auto-restart mode until the error is removed. Reasonable set of VCC voltage, Tons 1 Toffs 1 VCC_OVP can be used to accurately set the output over-voltage protection. The relationship between the output constant-current Iout and secondary peak current Ipks is given by: Iout winding current is greater than 5mA, resulting in VCC 18.7V, Output Over Voltage Protection When VFB>6V (continues for 6 cycles) since the Vout is too 1 Tons Ipks 2 Tons Toffs high, or VCC>18.7V, WS2596B will enter Over Voltage At the instant of D1 turn-on, the primary current transfers to Protection status. The switching pulses will be stopped, and the secondary at an amplitude of: IC auto-restart. Np Ipks Ipk Ns Output Under Voltage Protection Thus the output constant-current is given by: Iout 1 Np Tons 1 Np Ipk Ipk 2 Ns Tons Toffs 4 Ns When Vout is less than 60% of the value of designing, and remains more than 64mS, WS2596B will enter Under Voltage Protection status. The switching pulses will be stopped, and Cable Compensation IC auto-restart. WS2596B detects the duty cycle (Tons/T) of the secondary side using internal RC filter. The larger the Tons/T， which means the greater the load, the IC drags more current from FB pin, thus through the feedback loop, the output voltage Intelligent Thermal Control and OTP When Tj rises to 133℃, internal intelligent thermal control will make the output power reduced. would be higher. When Tj is 150℃, IC will enter OTP, then begin to auto-restart. Leading Edge Blanking When the power switch is turned on, a turn-on spike will Pin Open / Short Protection occur on the sense-resistor. To avoid false-termination of the WS2596B has built-in pin open/short protections, such as switching pulse, a 800ns leading-edge blanking is built in. During this blanking period, the current sense comparator is disabled and the gate driver can not be switched off. GND open protection, CS open/short protection, Rcs open/short protection, FB resister open/short protection. Each kind of bugs like above happened, IC will stop operating in order to avoid any damage to the system and load. CCM Protection The WS2596B is designed to operate in discontinuous conduction mode (DCM) in both CV and CC modes. To avoid Secondary operating in continuous conduction mode (CCM), the Protection WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 SBD WINSEMI Short and MICROELECTRONICS Transformer WINSEMI Saturation MICROELECTRONICS 6/9 WS2596B Product Description The Vcs will rise up rapidly when the secondary SBD is Because the transistor is a current amplifier, its collector shorted of the transformer is saturation. When Vcs >1.5V, current and base current has a certain ratio. WS2596B works the switching pulses will be stopped, and IC auto-restart. in discontinuous mode. When the internal BJT is ON, the If VFB>-1.2V during primary ON, IC will auto-restart, too. collector current will rise from 0, in order to reduce the driving loss, the base current will start from 12mA, and then with the CS Threshold When the load is high, the CS threshold is 500mV. To improve the audio noise suppression, the CS threshold will CS voltage rise, base current ratio increased, when the CS voltage reached 430mV, the base current will rise to 40mA. be reduced to 330mV when the system operates with light Random Frequency jitter load or no load. WS2596B has built-in random frequency jitter to reduce system EMI. Slope Drive Technology 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 WS2596B Product Description SOP7 Package Dimension 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 WINSEMI 0.40 MICROELECTRONICS www.winsemi.com WINSEMI 0.80 MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI 0.016 MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS 0.031 WINSEMI MICROELECTRONICS 8/9 WS2596B 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