OB2278/OB2279 is a highly integrated high performance PWM controller IC used in AC/DC switch mode power supply applications. Incorporated with On-Bright patented proprietary technology, OB2278/OB2279 helps to achieve low system standby power and high efficiency at reduced BOM cost. OB2278/OB2279 features variable latch shutdown protection options. Frequency shuffling technique is implemented in OB2279 to reduce challenge in system EMI design.


Features:

◆ Built-in power on soft start to reduce power MOSFET requirement
◆ VDD over voltage protection(OVP) – latch shutdown
◆ Over temperature protection(OTP) – auto recovery or latch shutdown
◆ High integration with low BOM count
◆ Extended burst mode control for improved efficiency and low standby power design
◆ Audio Noise Free Operation
◆ Internal Synchronized Slope Compensation
◆ Leading Edge Blanking on Current Sense Input
◆ VDD Under Voltage Lockout with Hysteresis (UVLO)
◆ Over Load Protection(OLP) – Auto Recovery or Latch Shutdown
◆ Built-in OCP Compensation to Achieve small OPP Variation over Universal AC Input Range
◆ Flexible Latch Shutdown Combinations: OVP; OVP+OTP; OVP+OTP+OLP
◆ Available in DIP8 and SOP8 packages,RoHS compliant



Applications:

◆ LCD Monitor, LCD TV
◆ Notebook Adapter
◆ Open-Frame SMPS

Typical Application: