GENERAL DESCRIPTIONHT2269 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 tightrange.At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved.VDD low startup current and low operating current contribute to a reliable power on startup design with HT2269. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope compensation improves system large signal stability and reduces the possible sub-harmonic oscillation at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch due to snubber circuit diode reverse recovery. This greatly helps to reduce the external component count and system cost in application. HT2269 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), VDD over voltage protection (OVP) and under voltage lockout (UVLO). The Gate-drive output is clamped at 18V to protect the power MOSFET. In HT2269, OCP threshold slope is internally optimized to reach constant output power limit over universal AC input range. Excellent EMI performance is achieved frequency shuffling technique together with soft switching control at the totem pole gate drive output. The tone energy at below 20KHZ is minimized in operation. Consequently, audio noise erformance is greatly improved. HT2269 is offered in both SOP-8 and DIP-8 packages.
深圳益景盛电子，原厂授权直销HT2269 价格优势 原厂技术支持
