OB2632G

GENERAL DESCRIPTION

OB2632G is a highly integrated current mode PWM control IC with high voltage startup, optimized for high performance, low standby power consumption and wide output voltage range PD adapter solutions, together with PD secondary controller, such as OB2612. The controller is as well compatible with cost effective offline flyback converter applications covering a wide output range.

At full loading, the IC operates in fixed frequency  mode. When the loading goes low, it operates in Green mode with valley switching for high power conversion efficiency. When the load is very small, the IC operates in ‘Extended Burst Mode’ to minimize the standby power loss. As a result, high conversion efficiency can be achieved in the whole loading range.

High voltage startup is implemented in OB2632G, which features with short startup time and low standby power loss.

OB2632G offers complete protection coverage  including cycle-by-cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), output short(SCP), output and VDD over voltage protection.  Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.

The tone energy at below 23KHz is minimized to avoid audio noise during operation.

OB2632G is offered in SOP8 package.

FEATURES

■   Multi-Mode Operation

o   125KHz max frequency mode @ Peak Load

o   65KHz or 45KHz fixed  frequency mode @ Full Load

o   Valley switching operation @ Green mode

■   Burst Mode @ Light Load & No Load

■   Adaptive loop gain compensation with Iovp current detection

■   Ultra low operating current at light/no load

■   Internal OCP compensation for universal line voltage

■   Extended burst mode control for improved efficiency and low standby power

■   Power on soft start reducing MOSFET Vds stress

■   Frequency shuffling for EMI

■   Audio noise free operation

■   High voltage startup integrating intelligent brownout detection, AC off detection with X-CAP discharge function

■   Comprehensive protection coverage

o   VDD under voltage lockout with hysteresis (UVLO)       

o   Cycle-by-cycle over current protection (OCP) with auto-recovery

o   Overload protection (OLP) with auto-recovery

o   Over temperature protection (OTP) with latch shut down

o   VDD over voltage protection with latch shut down

o   Output over voltage protection with latch shut down

o   Output short protection (SCP) with auto-recovery

o   Brownout protection with auto-recovery (OB2632G only)

o   Output diode short protection with auto-recovery

APPLICATIONS

Offline AC/DC flyback converter for

■   PD adapters

■   Wide output range adapters

 

TYPICAL APPLICATION