WS2293B Product Description Switching Mode Power Supply PWM Controller WS2293B Features Description Low startup current (4uA) Low operation current (1.7mA) which is optimized for high performance. It is applied for small and 0.9mA operation current at no-load medium-sized power supply devices, for example, the power adapter. Standby power <75mw Current mode operation Advanced frequency jittering control Patented RT Pin energy saving lower technology energy-saving at no-load and RT pin energy-saving contribute to Secondary Rectifier Short Protection minimize the power consumption (<75mw) and meet the efficiency External programmable OTP and OVP Cycle by cycle Over Current Protection The WS2293B is a highly integrated current mode PWM control IC For lower standby power consumption and higher energy saving 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, (OCP) the IC operates in extended ‘burst mode’ to minimize switching loss by the switching frequency. The patented technologies of standard of DoE or ErP VI. The WS2293B applies advanced frequency jittering control to improve EMI performance at half load and light-load. Besides, it covers wide supply voltage(7.5-34V), which greatly facilitate the transformer CS open protection Over temperature protection(OTP） Soft-start function system large signal stability and reduces the possibility of the VDD over voltage protection and clamp sub-harmonic oscillation at high PWM duty cycle output. Leading-edge VDD Under voltage lockout with design and the compatibility of the system. The internal synchronous slope compensation circuit improves blanking on current sense input removes the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the hysteresis (UVLO） external component count and system cost in the design. Wide operation voltage (7.5-34V) Driver Output clamped (13V) self-recovery feature including cycle by cycle over current protection Soft-driver function for lower EMI (OCP), over load protection (OLP), over temperature protection (OTP), Constant output power limited VDD over Voltage Protection (OVP), under voltage lockout (UVLO), Over load protection(OLP) Maximum Driver Capability: 60W The WS2293B offers complete protection coverage with automatic Secondary rectifier short protection, and external programmable OTP and OVP with high precision. The gate-driven output is clamped to maximum 13V to protect the external MOSFET. Excellent EMI performance is achieved by using the frequency jitter and the soft-switching at the totem pole gate drive output. The audio energy at below 20KHz is minimized in the design and audio noise is Applications eliminated during operation. Universal switching mode power supply and The WS2293B can be used as the best alternative products of the offline AC/DC flyback converter: linear power supply or the RCC-mode power to improve the whole performance of the switching power system and lower the cost. Battery Charger The WS2293B is available in SOT23-6 package. Power Adaptor Set-Top Box Power Supplies Open-frame SMPS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 0322 WS2293B Product Description Typical Application Circuit Note：Diode, zener and NTC resistor in the dashed box are optional components, which can be used for external programmable OTP and OVP. Pin Configuration and Marking Information The WS2293B is available in SOT23-6 Package. The top marking is shown as below: 2293B：Product Code X：Product Code YM：Production Date XX：Internal Code for QC Pin Definition Pin Name Pin No. Pin Type GND 1 Ground FB 2 RT Function Description Ground Feedback Feedback input pin. The PWM duty cycle is determined by voltage into this Input pin and the current-sense signal at Pin 4 Used to set external programmable OTP and OVP; connect to auxiliary Protection 3 winding through diode and zener for accurate output OVP; connect to NTC Setting resistor for accurate OTP; Must be floated when not in use. Current Current Sense Input. The current sense resistor between this pin and GND SENSE 4 VDD 5 Power Power Supply GATE 6 Output Gate Driver Output for External Power MOSFET. WINSEMI MICROELECTRONICS www.winsemi.com Monitoring WINSEMI is used for current limit setting. MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 2/3 WS2293B Product Description Internal Block Diagram GND VDD 5.5V Internal supply UVLO VDD_low VD D _ OVP OSC VDD_low OLP Burst mode FB Soft driver Logic VDD_low GATE OTP 100u OVP PWM CS 1 V I_save Slope comp LEB RT 2 .5 V OCP cla mp OTP SBD short Ordering Information Package Marking Part Number 6-Pin SOT23-6, Pb-free 2293B WS2293BYP 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 VSENSE SENSE input voltage -0.3~7 V VRI RI input voltage -0.3~7 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 Absolute Maximum Ratings Note: Stresses above those listed Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, functional operation of the device should not over these or any of these absolute maximum ratings. Operating above the absolute maximum-rated conditions may affect device reliability. WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/10 WS2293B Product Description ESD Information Symbol Parameter VESD-HBM Human body mode on all pins VESD-MM Machine mode on all pins Value Unit 3 KV 300 V Electrical Characteristics Symbol Parameter Test condition Min Typ Max Unit 34 V Supply Voltage (VDD) VDD_OP Operation voltage UVLO_ON Turn on threshold Voltage 7.2 7.9 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,RI=100K 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 Fosc Frequency VDD=16V，FB=3.2V 60 65 70 khz D_max Max duty VDD=16V，FB=3.2V 70 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 % Fosc_BM Burst mode frequency Frequency ∆f_temp versus temp. Deviation ∆f_VDD WINSEMI variation Frequency variation versus VDD MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/10 WS2293B Product Description Thermal protection T_shutdown Thermal shutdown temperature 150 ℃ RT section I_RT RT source current VDD=16V，RT<1.1V 95 100 105 uA Vth_OTP RT low protection VDD=16V，RT fall from 1.2V 0.95 1 1.05 V Vth_OVP RT high protection VDD=16V，RT rise from 1.5V 1.6 2.1 2.6 V RT_float RT floating voltage VDD=16V 1.1 1.3 1.5 V I_RT_sink RT sink current @ clamp VDD=16V，RT=2.1V TD_RT Delay for RT protection 8 CLK cycle 135 uA 8 CLK GATE Output Section VOL Output voltage Low VDD = 16V, Io = -20mA VOH Output voltage high VDD = 16V, Io = 20mA 9 VClamp Output clamp voltage VDD = 20V 11 Tr Rising time VDD = 16V, GATE with 1nF to GND 635 ns Tf Falling time VDD = 16V, GATE with 1nF to GND 105 ns WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI 0.8 MICROELECTRONICS V V 13 WINSEMI 14.5 MICROELECTRONICS V 3/10 WS2293B Product Description Application Information Soft-start As soon as VDD reaches UVLO (on), the soft-start The WS2293B is a highly integrated and high performance current mode PWM control IC. It is applied for small and medium-sized power （<60W）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 WS2293B also has multiform Advanced Frequency Jittering Control The WS2293B 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 WS2293B 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 WS2293B 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 startup resistor of 2 MΩ, 1/8 W could be used together with a VDD capacitor to provide a fast startup and low power dissipation solution. Operating Voltage The WS2293B covers wide supply voltage from 7.7V to 34V, which helps easing the transformer design, and a same transformer 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 WS2293B. The operating current of the WS2293B 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 3/10 WS2293B 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. avoid the interference with OTP, the voltage of zener should be higher than the highest voltage of normal value with a margin of 3V or above, which is to ensure that there is no current from zener to the RT Pin in the normal operating Internal Synchronized Slope Compensation Built-in slope compensation circuit adds slope voltage state. The RT Pin must be floated when not used. onto the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and Gate Driver prevents the sub-harmonic oscillation and thus reduces the output ripple voltage. GATE pin of the WS2293B is connected to the gate of an external MOSFET. If the gate drive capacity is too weak will cause higher switching loss of MOSFET, while too CS Open Protection & Secondary Rectifier Short strong gate drive output cause EMI problem. A good tradeoff Protection When the CS pin is opened, the WS2293B will shut down after a few cycles. When the secondary rectifier is short, the WS2293B will be in protection state after 8 pulse periods of VDD. The controller enters into UVLO auto between output capacity and dead time control is achieved through the design of the built-in totem pole driver in the WS2293B. The low standby dissipation and good EMI system design is easier to achieve through this dedicated device. For MOSFET gate protection, an internal 13V clamp recovery until the fault is removed. is added. RT Pin Protection Setting (OTP and OVP) Protection Controls The WS2293B offers external programmable OTP and Good power supply system reliability is achieved with OVP through RT pin. The RT Pin generates 100uA current auto-recovery protection features including Cycle-by-Cycle and connects to a NTC resistor for external programmable current limiting (OCP), Over Load Protection (OLP), Over OTP. When the voltage of RT is lower than 1.0V, the system starts the protection mode; when the Secondary Rectifier is off and the voltage of RT is higher than 2.1V, the system Temperature Protection (OTP), CS open Secondary Rectifier Short Protection, protection, Under Voltage Lockout on VDD (UVLO), , and VDD over Voltage Protection & VDD clamp, and external programmable OTP and OVP. also is into protection and connects to auxiliary winding Internal line voltage compensation of OCP helps to through diode and zener for external programmable OVP. To achieve constant output power limit over the universal input voltage range. WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/10 WS2293B Product Description Package Information SOT23-6 Package Outline Dimensions Unit:mm A C2 B1 B θ1 θ B2 A2 R θ3 C D R2 R1 C1 θ2 D1 D3 D2 A1 Winsemi Dimensions in Millimeters Symbol Dimensions in Inches Min Max Min Max A 2.72 3.12 0.107 0.123 B 1.40 1.80 0.055 0.071 C 1.00 1.20 0.039 0.047 A1 0.90 1.00 0.035 0.039 A2 0.30 0.50 0.012 0.020 B1 2.60 3.00 0.102 0.118 B2 0.119 0.135 0.005 0.005 C1 0.03 0.15 0.001 0.006 C2 0.55 0.75 0.022 0.030 D 0.03 0.13 0.001 0.005 D1 0.30 0.60 0.012 0.024 D2 0.25TYP D3 WINSEMI 0.60 MICROELECTRONICS www.winsemi.com WINSEMI 0.70 MICROELECTRONICS Tel : +86-755-8250 6288 0.01TYP WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 0.024 WINSEMI MICROELECTRONICS 0.028 WINSEMI MICROELECTRONICS 2/3 WS2293B 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 WINSEMI MICROELECTRONICS www.winsemi.com WINSEMI MICROELECTRONICS Tel : +86-755-8250 6288 WINSEMI MICROELECTRONICS Fax : +86-755-8250 6299 WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 3/10