OB2578T Overview
OB2578T is an excellent primary side regulation power switch with CC/CV operation for medium level power AC/DC charger and adapter applications. The device operates in CCM/QR mode to provide high efficiency along with several functions of built-in protections. It removes the need for secondary feedback circuitry to lower the total bill of material cost.
OB2578T Key Features
- Primary-side sensing and regulation operates in CCM/QR mode without TL431 and opto-coupler
- High precision constant voltage and current regulation at universal AC input
- Fixed frequency (65kHz) CCM mode operation with low line voltage at full load
- Integrated 4A MOSFET
- Programmable CV and CC regulation
- Good dynamic response
- Built-in line pensation for tight CC
- Built-in fixed cable pensation
- Built-in primary winding inductance
- Built-in control loop pensation
OB2578T Applications
- Primary-side sensing and regulation operates in CCM/QR mode without TL431 and opto-coupler