XN1049

XN1049 Switch Power Supply PWM Controller XN1049 Switch Power Supply PWM Controller General Description XN1049 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 XN1049. A large value resistor could thus be used in the startup circuit to minimize the power consumption and improve the efficiency of the power convent. 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(CS) 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. XN1049 offers complete protection coverage with automatic self-recovery feature including over current protection cycle by cycle (OCP), over load protection (OLP), under voltage lockout (UVLO). The gate-driven output is clamped to maximum 18V to protect the external MOSFET. E...