OB2631x 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.

OB2631x offers comprehensive protection coverage with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VDD under voltage lockout (UVLO) and internal  over temperature protection (OTP).  Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.

The tone energy at below 23KHz is minimized in the design and audio noise is eliminated during operation.

OB2631x is offered in SOP8 package.


   Very wide range of VDD supply voltage

   Standby power < 75mW 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

   Fixed 65KHZ (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

o    VDD Under Voltage Lockout with hysteresis (UVLO)   

o    VDD Over Voltage Protection (VDD OVP)  

o    Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range

o    Over Load Protection (OLP) with auto-recovery

o    Output diode short protection with auto-recovery



Offline AC/DC flyback converter for

      PD adapter

■   Wide output range adapter