OB2269C is a highly integrated current mode PWMcontrol IC optimized for high performance, lowstandby power and cost effective offline flybackconverter applications.PWM switching frequency at normal operation isexternally programmable and trimmed to tight range.At no load or light load condition, the IC operates inextended ‘burst mode’ to minimize switching loss.Lower standby power and higher conversionefficiency is thus achieved.VDD low startup current and low operating currentcontribute to a reliable power on startup design withOB2269C. A large value resistor could thus be usedin the startup circuit to minimize the standby power.The internal slope compensation improves systemlarge signal stability and reduces the possible subharmonicoscillation at high PWM duty cycle output.Leading-edge blanking on current sense inputremoves the signal glitch due to snubber circuit diodereverse recovery. This greatly helps to reduce theexternal component count and system cost inapplication.OB2269C offers complete protection coverage withautomatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection(OLP), over temperature protection (OTP), VDDover voltage protection (OVP) and under voltagelockout (UVLO). The Gate-drive output is clampedat 18V to protect the power MOSFET.In OB2269C, OCP threshold slope is internallyoptimized to reach constant output power limit overuniversal AC input range.Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling techniquetogether with soft switching control at the totem polegate drive output.