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WS3256 Datasheet(PDF) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WS3256 Datasheet(HTML) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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1 / 9 page  Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. W/T-D021-Rev.A/1 May.2014 1113 WS3256 Product Description WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS WINSEM I M ICROELECTRONICS Features Features Features Features � 5uA ultra-low startup current � 2mA Low operating current � ±5% Constant Voltage Regulation at Universal AC input � Primary-side Sensing and Regulation Without TL431 and Opto-coupler � Programmable CV and CC Regulation � Built-in Primary winding inductance compensation � Programmable cable drop compensation � Built-in soft start � � � � Built-in Leading-edge blanking � Cycle by cycle over current protection (OCP) � VCC over voltage clamp & under voltage lockout( UVLO) � Maximum Gate output voltage clamped at 12V � Frequency jittering � Ultra low standby power (<100mW) Applications Applications Applications Applications Low power AC/DC offline SMPS for � Cell Phone Charger � Digital Cameras Charger � Small Power Adapter � Auxiliary Power for PC, TV etc. � Linear Regulator/RCC Replacement General General General General Description Description Description Description WS3256 is a high-integrated offline PWM controller, optimized for high performance low power AC/DC charger and adapter application. WS3256 operates in primary-side sensing and regulation. Consequently, optocoupler and TL431 could be eliminated, thus reduce the cost. It can achieve ±5% constant voltage precision in full input voltage range. CC/CV Control as shown in fig.1.In CC Control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built-in cable drop compensation. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at light/medium load. Fig.1 Typical CC/CV Curve WS3256 offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VCC OVP, VCC clamp and UVLO. The gate-driven output is clamped to maximum 12V to protect the internal MOSFET. Excellent EMI performance is achieved by using the soft-switching and frequency jittering at the totem-pole-gate-drive output. The WS3256 is the ideal substitute of the linear power supply or the RCC-mod e power, for a better performance of the whole switch power system and a lower cost. WS3256 is available in DIP-8 package. High High High High Precision Precision Precision Precision Primary-Side Primary-Side Primary-Side Primary-Side Off-line Off-line Off-line Off-line PWM PWM PWM PWM Power Power Power Power Switch Switch Switch Switch V o I o 5 % I c c |
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