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OB2298 Datasheet

PWM Controller

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OB2298
PWM Controller with PFC Standby Control
GENERAL DESCRIPTION
OB2298 is a highly integrated current mode PWM
controller for medium to high power offline flyback
converter applications.
OB2298 integrates PFC IC power supply control
function and shuts down PFC stage at no load or light
load conditions.
To meet the increasing stringent standby power
requirements in light or zero load, OB2298 operates
in On-Bright’s proprietary “extended burst mode”
without audio noise. Constant power limit is achieved
by On-Bright’s proprietary OCP compensation
technique where OCP due to CCM and DCM mode
difference is compensated in universal AC input
applications.
OB2298 offers comprehensive protection coverage
including Cycle-by-Cycle current limiting, internal
Power-On Soft Start, VDD Under Voltage Lockout
(UVLO), VDD Over Voltage Protection (OVP),
VDD Clamp, Gate Clamp, Over Load Protection
(OLP), Over Temperature Protection (OTP),
Programmable Brownout Protection, All Pins
Floating Protection, and RT Latch triggering feature.
In applications where VDD is supplied by auxiliary
power supply, the built-in 1 second restart timer can
prevent permanent OLP latch. In other applications,
this restart timer will not be triggered.
To achieve good EMI performance, On-Bright’s
proprietary built-in frequency shuffling is provided,
also with soft switching control at the totem pole gate
drive output.
OB2298 is offered in SOP-8 and DIP-8 packages.
FEATURES
Direct Control of PFC
Programmable Brownout Protection
Internal 4ms Power On Soft Start Time
Internal Restart Timer
Pin Floating Protection
Proprietary Extended Burst Mode Control For
Improved Efficiency and Minimum Standby
Power Design
Built-in Frequency Shuffling for Better EMI
Built-in Leading Edge Blanking
Proprietary OCP Compensation for Universal AC
Input Range
Low Startup Current(5uA) and Low Operating
Current (2.3mA)
Built-in Synchronized Slope Compensation
1.0A Peak Current Driving Capability
Audio Noise Free Operation
Convenient High and Low Triggering Level
Latch Off Function
APPLICATIONS
Offline AC/DC flyback converter for
Laptop Power Adaptor
LCD Monitor Power
LCD TV Power and Home Appliance Power
Printer Power
Lighting Power
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_9800
Free Datasheet http://www.datasheet4u.com/
On-Bright Electronics
On-Bright Electronics



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