GENERAL DESCRIPTION
OB2301W can support low system output voltage down to 2V at constant current mode. With its versatility and optimization, OB2301W can be used in various switch mode power supply topologies including secondary-side control topology and primary-side control topology. From the information on the secondary side of the isolation transformer, OB2301W generates a driving signal with dead time with respect to the primary side PWM signal to turn the integrated Nchannel SR switch on and off in proximity of the zero current transition with the help of smart driver voltage control. It is optimized for 5V output voltage. In primary-side control topology, OB2301W can detect the output voltage and feed back a series of warning pulses to primary side controller when the output voltage is lower than an inner-determined threshold to awaken the primaryside power switch to improve dynamic response. The externally adjustable minimum on time and property off time control scheme effectively avoid the ring impact induced by parasitic elements so that a reliable and noise free operation of the SR system is insured.
On-Bright Electronics
