Datasheet OB2 Equivalent ( PDF ) - Controller

The 0B2 is one of the B7G voltage stabilizer that were the last to be developed in the 1950\'s before semiconductors took over.

OB2201 is a high performance flyback QuasiResonant (QR) controller optimized to achieve high efficiency in the universal input range and full loading range with effective system cost.

OB2203 is a highly integrated Quasi-Resonant (QR) controller optimized for high performance offline flyback converter applications. At normal load condition, it operates in QR mode with minimum drain voltage switching.

OB2211 is an offline PWM Power switch for low power AC, DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated from design.

OB2211H is an offline PWM Power switch for low power AC, DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below.