LN3C69 Datasheet | Lii Semiconductor

FEATURES u Lii Semi Proprietary Cycle Turning Technology for Improved EMI Performance. u Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design u Audio Noise Free Operation u External Programmable PWM Switching Frequency and Over Temperature Protection (OTP) u Internal Synchronized Slope pensation u Low VDD Startup Current and Low Operating Current u Leading Edge Blanking on Current Sense Input u VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO) u Gate Output Maximum Voltage Clamp (18V) u Line Input pensated Over Universal Input Voltage Range. u Cycle-by-Cycle Over-current Threshold Setting For Constant Output Power Limiting Over Universal Input Voltage Range. u Overload Protection (OLP) APPLICATIONS ² Offline AC/DC flyback converter ² Battery Charger ² Power Adaptor ² Note Book Power Supplies ² Open-frame SMPS GENERAL DESCRIPTION LN3C69 is is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications in less than 70W range. PWM switching frequency at normal operation is externally programmable and trimmed to tight range. 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 LN3C69. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope pensation 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 and thus greatly reduces the external ponent count and system cost in the design. LN3C69 offers plete protection coverage with automatic self-recovery feature including...