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WS2259DP Datasheet(PDF) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WS2259DP Datasheet(HTML) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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1 / 11 page  Rev.A Apr.2011 WS2259 WS2259 WS2259 WS2259 Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. Features Features Features Features ■ Burst Mode function ■ Low startup current (4uA) ■ Low operation current (1.7mA) ■ Built in Leading edge blanking (LEB) ■ Built in Synchronous slope compensation ■ Current mode operates ■ External programmable switching frequency ■ Cycle by cycle Over Current Protection ■ over temperature protection(OTP） ■ Soft-start ■ VDD over voltage protection and clamp ■ under voltage lockout with hysteresis(UVLO） ■ Driver Output clamped(13V) ■ Soft-driver function for lower EMI ■ Frequency jitter ■ Constant output power limited ■ Over load protection(OLP) ■ Free audio noise operation Applications Applications Applications Applications Universal switch power supply and offline AC/DC flyback converter: ■ Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies ■ Open-frame SMPS Typical Typical Typical Typical Application Application Application Application Circuit Circuit Circuit Circuit General General General General Description Description Description Description WS2259 which is optimized for high performance is a highly integrated current mode PWM control IC. It is applied for switch power of the small-sized and medium-sized for example the power adaptor. For lower the standby power and higher RoHS compliant, the IC has the Burst Mode function and very low startup current and working 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 low startup current and low operating current contribute to a reliable power on startup design with WS2259. A large value resistor could thus be used in the startup circuit to minimize the power consumption and improve the efficiency of the power convert. The internal synchronous slope compensation circuit improves system large signal stability and reduces the possible subharmonic oscillation at high PWM duty cycle output. Leading-edge blanking on current sense(SENSE) input removes the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design. WS2259 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, under voltage lockout (UVLO). 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 tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. The IC can be used as the best alternative products of the linear power supply or the RCC-mode power to improve the whole performance of the switch power system and lower the cost. WS2259 is offered in SOT23-6, SOP-8 and DIP-8 packages. |
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