开关电源IC-OB2298-Data.pdf

OB2298
PWM Controller with PFC Standby Control


GENERAL DESCRIPTION
OB2298 is a highly integrated current mode PWM FEATURES
controller for medium to high power offline flyback ■ Direct Control of PFC
converter applications. ■ Programmable Brownout Protection
OB2298 integrates PFC IC power supply control ■ Internal 4ms Power On Soft Start Time
function and shuts down PFC stage at no load or light ■ Internal Restart Timer
load conditions. ■ Pin Floating Protection
To meet the increasing stringent standby power ■ Proprietary Extended Burst Mode Control For
requirements in light or zero load, OB2298 operates Improved Efficiency and Minimum Standby
in On-Bright’s proprietary “extended burst mode” Power Design
without audio noise. Constant power limit is achieved ■ Built-in Frequency Shuffling for Better EMI
by On-Bright’s proprietary OCP compensation ■ Built-in Leading Edge Blanking
technique where OCP due to CCM and DCM mode ■ Proprietary OCP Compensation for Universal AC
difference is compensated in universal AC input Input Range
applications. ■ Low Startup Current(5uA) and Low Operating
OB2298 offers comprehensive protection coverage Current ()
including Cycle-by-Cycle current limiting, internal ■ Built-in Synchronized Slope Compensation
Power-On Soft Start, VDD Under Voltage Lockout ■ Peak Current Driving Capability
(UVLO), VDD Over Voltage Protection (OVP), ■ Audio Noise Free Operation
VDD Clamp, Gate Clamp, Over Load Protection ■ Convenient High and Low Triggering Level
(OLP), Over Temperature Protection (OTP), Latch Off Function
Programmable Brownout Protection, All Pins
Floating Protection, and RT Latch triggering feature. APPLICATIONS
In applications where VDD is supp