50W 适配器电源稳先方案.pdf

WS2299 Current Mode PWM Controller Features Burst Mode Control applications. 6.5uA ultra-low startup current For lower the standby power and higher RoHS 2.3mA Low operating current compliant, the IC offers a Burst Mode control feature Built-in Leading-edge blanking and ultra-low start-up current and operating current, Built-in synchronous slope compensation circuit that is, at the condition of no load or light load, Current Mode Operation WS2299 can reduce the switch frequency linearly Soft-start 4ms which minimize the switching power loss; the Soft-driver ultra-low startup current and operating current make a Optional latch for OTP、OLP、OVP reliable power for startup design, and also large External Programmable switching frequency resistor can be used in the startup circuit to improve External Programmable over temperature switching efficiency. protection The internal synchronous slope compensation circuit Cycle by cycle over current protection (OCP) reduces the possible subharmonic oscillation at high Internal OCP compensation PWM duty cycle output. Leading-edge blanking on Optional VDD OVP