电源类芯片-OB528X-OB5282

OB5282

GENERAL DESCRIPTION

OB5282 is a highly integrated current mode PWM control IC with high voltage startup, optimized for high performance, low standby power consumption and cost effective offline flyback converter applications. The controller ‘s HV pin is used for high voltage startup, AC off detection, and X-cap Voltage discharge , this structure allows the brownout detection as well.

At full loading, the IC operates in fixed frequency (65KHz) 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 OB5282, which features with short startup time and low standby power loss.

OB5282 offers complete protection coverage including cycle-by-cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), output and VDD over voltage protection. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.

The tone energy at below 25KHz is minimized to avoid audio noise during operation.

OB5282 is offered in SOP8 package.

FEATURES

High voltage startup

Power on soft start reducing MOSFET Vds stress

Frequency shuffling for EMI

Multi-Mode Operation

125KHz max frequency mode @ Peak Load

65KHz fix frequency mode @ Full Load

Valley switching operation @ Green mode

Burst Mode @ Light Load & No Load

Audio noise free operation

Peak power delivery for peak load

Tighten and programmable output over current protection

Comprehensive protection coverage

VDD under voltage lockout with hysteresis (UVLO)
Cycle-by-cycle over current protection (OCP) with auto-recovery
Overload protection (OLP) with auto-recovery
Over temperature protection (OTP) with latch shut down
VDD over voltage protection with latch shut down
Output over voltage protection with latch shut down
Brownout protection with auto-recovery
Output diode short protection with latch shut down

Intelligent AC off detection with X-CAP discharge function

APPLICATIONS

Offline AC/DC flyback converter for

Power adaptor

Open-frame SMPS

PK Load Application

TYPICAL APPLICATION