OB2631

GENERAL DESCRIPTION

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.

FEATURES

■   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

   

APPLICATIONS

Offline AC/DC flyback converter for

■      PD adapter

■   Wide output range adapter

 TYPICAL APPLICATION‍