OB2358L

OB2358L Current Mode PWM Power Switch Frequency Shuffling Product Specification GENERAL DESCRIPTION OB2358L combines a dedicated current mode PWM controller with a high voltage power MOSFET. It is optimized for high performance, low standby power, and cost effective off-line flyback converter applications in sub 27W range. OB2358L offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), over voltage protection and VDD under voltage lockout (UVLO). Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output. The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. OB2358L is offered in DIP8 package. APPLICATIONS Offline AC/DC flyback converter for ■ AC/DC adapter ■ PDA power supplies ■ Digital Cameras and Camcorder Adapter ■ VCR, SVR, STB, DVD&DVCD Player SMPS ■ Set-Top Box Power ■ Auxiliary Power Supply for PC and Server ■ Open-frame SMPS TYPICAL APPLICATION FEATURES ■ Power on Soft Start Reducing MOSFET Vds Stress ■ Frequency shuffling for EMI ■ Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design ■ Audio Noise Free Operation ■ Fixed 50KHZ Switching Frequency ■ Internal Synchronized Slope Compensation ■ Low VDD Startup Current and Low Opera...