OB2262 Datasheet | On-Bright

Current Mode PWM Controller GENERAL DESCRIPTION OB2262 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications in sub 30W 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 OB2262. 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(CS) 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. OB2262 offers plete protection coverage with automatic self-recovery feature including Cycle-by- Cycle current limiting (OCP), over load protection (OLP), VDD over voltage clamp and under voltage lockout (UVLO). The Gate-drive output is clamped to maximum 18V to protect the power MOSFET. Excellent EMI performance is achieved soft l switching control at the totem pole gate drive output. ntia TYPICAL APPLICATION Confide AC IN F i l te r + + On-Bright V DD GATE RI SENSE FB GND The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. OB2262 is offered in SOT23-6, SOP-8 and DIP-8 packages. Features ) 电 - Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design 化 - Audio Noise Free Operation - External Programmable PWM Switching 纳...