OB233X Flyback Power Switch

OB233X 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. OB233X 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. OB233X is offered in SOP8/DIP8 package

Key Features

• Level 5 compliance with < 100mW standby power at universal AC input
• 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 55KHZ (typical) switching frequency
• Internal synchronized slope compensation
• Low VDD startup current and low operating current
• Leading edge blanking on current sense input
• Comprehensive protection coverage
• VDD under voltage lockout with hysteresis (UVLO)
• Over temperature protection (OTP) with auto- recovery
• On-Bright proprietary line input compensated
• Cycle-by-Cycle over-current threshold setting for constant output power limiting over universal input voltage range.

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

Part Numbers

• OB233X

Product family: On-Bright official page