WS2283

WS2283 Product Description Features ■ Burst Mode Control ■ 5uA ultra-low startup current ■ 1.8mA Low operating current ■ Built-in Leading-edge blanking ■ Built-in synchronous slope compensation circuit ■ Built-in Soft-Start ■ 65kHz fixed switch frequency ■ Cycle by cycle over current protection (OCP) ■ VCC over voltage clamp & under voltage lockout( UVLO) ■ Over load protection (OLP) ■ OTP and OVP shut down latch ■ Maximum Gate output voltage clamped at 13.8V ■ Frequency jittering ■ Adjustable OVP through external Zener ■ Ultra low standby power (<100mW) Applications Universal switch power supply equipment and offline AC/DC flyback power converter ■ Power Adapter ■ Set-Top Box Power Supplies ■ Open-frame SMPS ■ Battery Charger Current Mode PWM Controller General Description WS2283 is a high performance current mode PWM controller, optimized for low power switch equipment. For lower the standby power and higher RoHS compliant, the IC offers a Burst Mode control feature and ultra-low start-up current and operating current, that is, at the condition of no load or light load, WS2283 can reduce the switch frequency linearly which minimize the switching power loss; the ultra-low startup current and operating current make a reliable power for startup design, and also large resistor can be used in the startup circuit to improve switching efficiency. The internal synchronous slope compensation circuit reduces the possible sub-harmonic oscillation at high PWM duty cycle output. Leadi...