WS2297B Product Description WS2297B Switch Power Supply PWM Controller Features Description Low startup current (4uA) Low operation current (1.7mA,0.9mA which is optimized for high performance. It is applied for small and operation current at no-load) medium-sized power supply devices, for example, the power adapter. The WS2297B is a highly integrated current mode PWM switch IC For lower standby power consumption and higher energy saving Low Standby power Current mode operation Advanced frequency jittering control Secondary Rectifier Short Protection Cycle by cycle Over Current Protection energy-saving at no-load contribute to minimize the power consumption (OCP) (<75mw) and meet the efficiency standard of DoE or ErP VI. requirement, the IC has the Burst Mode function and very low startup current and operating current. At the condition of no load or light load, the IC operates in extended ‘burst mode’ to minimize switching loss by lower the switching frequency. The patented technologies of The WS2297B applies advanced frequency jittering control to CS open protection Over temperature protection(OTP） Soft-start function VDD over voltage protection and clamp Under voltage lockout with hysteresis system large signal stability and reduces the possibility of the (UVLO） sub-harmonic oscillation at high PWM duty cycle output. Leading-edge Wide operation voltage (7.5-34V) blanking on current sense input avoids the signal glitch due to snubber Driver Output clamped(13V) circuit diode reverse recovery and thus greatly reduces the external Soft-driver function for lower EMI Frequency jittering Constant output power limited Over load protection(OLP) improve EMI performance at half load and light-load. Besides, it covers wide supply voltage(7.5-34V), which greatly facilitate the transformer design and the compatibility of the system. The internal synchronous slope compensation circuit improves component count and system cost in the design. The WS2297B offers complete protection coverage with automatic self-recovery feature including cycle by cycle over current protection (OCP), over load protection (OLP), over temperature protection (OTP), VDD over Voltage Protection (OVP), under voltage lockout (UVLO), Secondary rectifier short protection. The gate-driven output is clamped to maximum 13V to protect the external MOSFET. Applications Excellent EMI performance is achieved by using the frequency jitter Universal switch power supply and offline energy at below 20KHz is minimized in the design and audio noise is AC/DC flyback converter: and the soft-switching at the totem pole gate drive output. The audio eliminated during operation. Battery Charger The WS2297B can be used as the best alternative products of the Power Adaptor linear power supply or the RCC-mode power to improve the whole Set-Top Box Power Supplies performance of the switching power system and lower the cost. Open-frame SMPS The WS2297B is available in DIP7 package. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 0322 WS2297B Product Description Typical Application Circuit Pin Configuration and Marking Information The WS2297B is available in DIP7 Package. The top marking is shown as below: WS2297BD7P：Product Code A：Product Code X：Internal Code BCY：Internal Code For QC YMX：D/C Pin Definition Pin Name Pin No. Pin Type NC 1 NC VDD 2 Power FB 3 CS 4 DRIAN 5/6 Drain GND 7 Ground WINSEMI MICROELECTRONICS www.winsemi.com Function Description Hanged out Power Supply Feedback Feedback input pin. The PWM duty cycle is determined by voltage into this Input pin and the current-sense signal at Pin 4 Current Current monitoring feed-back input pin.To determine whether to reach the monitoring WINSEMI limit value. The drain terminal of Power MOSFET,connected with the transformer primary side. Ground MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 2/9 WS2297B Product Description Internal Block Diagram GND VD D 5 .5 V In te rn a l su p p l y U VL O VDD_OVP VD D _ l o w O SC VD D _ l o w DRAIN OLP Bu rst mo d e FB So ft d ri ve r Logic VD D _ l o w OTP OVP 1V I_ sa ve Sl o p e co mp CS CS 100u PW M L EB 2.5V OCP OTP clamp SBD sh o rt Ordering Information Package Marking Part Number 7-Pin DIP-7, Pb-free WS2297BD7P WS2297BD7P（DIP-7） Output Power 230VAC±15% 85-265VAC Adapter1 Adapter1 24W 18W Product WS2297B NOTE:The above data was tested in the adapter which in ambient temperature of 50 degrees Celsius and enough heat radiation Recommended Operation Conditions Symbol Parameter Value Unit VDD VDD Supply Voltage 10~30 V TA Operating temperature -20~85 ℃ Symbol Parameter Value Unit VDD DC Power Supply 34.5 V VFB FB input voltage -0.3~7 V Absolute Maximum Ratings 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 WS2297B Product Description VSENSE SENSE input voltage -0.3~7 V VDRAIN DRAIN pin voltage -0.3~650 V TJ Operation Junction Temperature -20~150 ℃ TSTG Storage Temperature -40~150 ℃ VCV Vcc Clamp Voltage 35.5 V ICC Vcc Clamp Continuous Current 10 mA 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 VESD-HBM Human body model on all pins VESD-MM Machine model on all pins Value Unit 3 KV 300 V Electrical Characteristics Supply Voltage (VDD) symbol parameter Test condition Min Typ Max Unit 34 V VDD_OP Operation voltage UVLO_ON Turn on threshold Voltage 7.2 8.1 9.0 V UVLO_OFF Turn-off threshold Voltage 14.0 15.0 16.0 V I_VDD_ST Start up current 4 10 uA I_VDD_OP Operation Current 1.7 2.5 mA VDD=13V VDD=16V, VFB=3V GATE with 1nF to GND VDD_OVP VDD_Clamp VDD Zener Clamp Voltage IVDD=10mA 34.5 V 35.5 V Feedback Input Section VFB_Open VFB Open Loop Voltage VDD=16V,FB open, 4.3 5.0 5.6 V IFB_Short FB Pin Short Current FB Shorted to GND 0.22 0.315 0.41 mA VTH_PL Power limiting FB Threshold VDD=16V 3.2 3.65 4.0 V TD_PL Power limiting Debounce VDD=16V，FB open 48 60 72 ms ZFB_IN Input Impedance VDD=16V，FB=2V/3V，CS open 13 16.5 20 kΩ Current Sense Section TLEB Leading edge Blanking Time 330 ns TD_OC OCP control delay GATE with 1nF to GND 70 ns VTH_OC OCP threshold FB＝3.4V 0.690 0.740 0.790 V Max_OC Max_OCP for line comp FB＝3.4V 0.9 0.95 1 V Vth_SBD CS threshold for SBD short VDD=16V Td_SBD Delay of SBD short protect 8 PWM cycle 2.0 V 8 CLK Oscillator Section WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 4/9 WS2297B Product Description Fosc Frequency VDD=16V，FB=3.2V 60 65 70 khz D_max Max duty VDD=16V，FB=3.2V 68 75 82 % Jitter period For 65K 4 ms Jitter range For 65K ±5 % VDD=16V, Fb fall from 2V to burst 22 khz TEMP = -20 to 85℃ 5 % VDD = 12 to 25V 5 % 150 ℃ Fosc_BM Burst mode frequency Frequency ∆f_temp variation versus temp. Deviation ∆f_VDD Frequency variation versus VDD Thermal protection T_shutdown Thermal shutdown temperature Power MOSFET Section MOSFET Drain-Source BVdss 650 breakdown voltage Static Drain to Source on Ron WS2297B resistance IDSS WINSEMI V 1.95 Output clamp voltage MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI 2.3 ohm 10 uA MICROELECTRONICS 5/9 WS2297B Product Description Application Information Soft-start As soon as VDD reaches UVLO (on), the soft-start The WS2297B is a highly integrated and high performance current mode PWM switch IC. It is applied for small and medium-sized power （<18W）supply devices, for function operates; the peak current is then gradually increased from zero. Every restart attempt is followed by 4ms soft-start example, the power adapter and chargers. The low startup current, operation current and burst mode function at the Burst Mode condition of no load and light load can decrease the standby At very light load or no load condition, the IC operates in power of the system, and improve the power conversion Burst Mode. In this condition, the voltage at FB is below efficiency. The patented technologies of energy-saving at burst mode threshold level, thus system goes into burst no-load and RT pin energy-saving contribute to minimize the power consumption (<75mw) and meet the efficiency standard of DoE or ErP VI. The internal synchronous slope mode. The gate dives output switching only when VDD voltage drops below a preset level or FB input is active to output an on state. Otherwise the gate drive remains at off state to minimize the switching loss thus reduce the standby compensation and the leading edge blanking function of the power consumption. The frequency control also eliminates Sense pin not only decrease the component number, but the audio noise at any load conditions. also improve the stability of the system and avoid the harmonics generation. The WS2297B also has multiform Advanced Frequency Jitter Control The WS2297B integrates the maximum operating auto-recovery protection. The main functions are described frequency of 65 KHz. The frequency jittering range is in as below. proportion to the switching frequency in traditional PWM controller, so that at half load or light load, the switching Startup Current and Startup Control Startup current of the WS2297B is designed to be very low（4uA） so that VDD could be charged up above UVLO threshold level and starts up quickly. A large value startup resistor can therefore be used to minimize the power loss, frequency is decreased, and the frequency jittering range is also decreased, which deteriorates the EMI performance. The WS2297B applies advanced frequency jittering control to keep better EMI performance at all load condition. predigest the design of startup circuit and provide reliable startup in application. For the design of AC/DC adaptor with universal input range, a 1206 resistor of 1.5 MΩ could be used together with a VDD capacitor to provide a fast startup and low power dissipation solution. Operating Voltage The WS2297B covers wide supply voltage from 7.7V to 34V, which helps easing the transform design, and a same transform can be used to design different output voltage, so that the compatibility is improved Current Sensing and Leading Edge Blanking Operating Current Cycle-by-Cycle current limiting is offered in WS2297B. The operating current of the WS2297B is very low. The switching current is detected by a sense resistor at the Good efficiency is achieved with low operating current SENSE pin. The internal Leading-edge blanking chops off together with extended burst mode control circuit which can the sense voltage spike at initial MOSFET on state due to decrease the value of VDD capacitor. snubber diode circuit reverse recovery and thus reduce the external RC filter circuit. The current limitation comparator is WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 6/9 WS2297B Product Description disabled and cannot turn off the external MOSFET during the blanking period. PWM duty cycle is determined by voltage level at SENSE pin and FB pin. will cause higher switching loss of MOSFET, while too strong gate drive output cause EMI problem. A good tradeoff between output capacity and dead time control is achieved through the design of the built-in totem pole driver in the Internal Synchronized Slope Compensation Built-in slope compensation circuit adds slope voltage WS2297B. The low standby dissipation and good EMI onto the current sense input voltage for PWM generation. system design is easier to achieve through this dedicated This greatly improves the close loop stability at CCM and device. For MOSFET gate protection, an internal 13V clamp prevents the sub-harmonic oscillation and thus reduces the is added. output ripple voltage. Protection Controls CS Open Protection & Secondary Rectifier Short Good power supply system reliability is achieved with Protection auto-recovery protection features including Cycle-by-Cycle When the CS pin is opened, the WS2297B will shut down after a few cycles. When the secondary rectifier is short, the WS2297B will be in protection state after 8 pulse periods of VDD. The controller enters into UVLO auto current limiting (OCP), Over Load Protection (OLP), Over Temperature Protection (OTP), CS open Secondary Rectifier Short Protection, protection, Under Voltage Lockout on VDD (UVLO), , and VDD over Voltage Protection & VDD clamp. recovery until the fault is removed. Internal line voltage compensation of OCP helps to achieve constant output power limit over the universal input voltage range. Gate Driver GATE pin of the WS2297B is connected to the gate of an external MOSFET. If the gate drive capacity is too weak 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 Package Information DIP7 Package Outline Dimensions Winsemi Dimensions in Millimeters Symbol 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 WINSEMI Dimensions in Inches 7.62TYP MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI 0.3TYP MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 8/9 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 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