OB2298 On-Bright Electronics, Inc., OB2298 Datasheet

OB2298

Manufacturer Part Number

OB2298

Description

Pwm Controller With Pfc Standby Control

Manufacturer

On-Bright Electronics, Inc.

Datasheet

1.OB2298.pdf (1 pages)

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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),

Programmable

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.

TYPICAL APPLICATION

©On-Bright Electronics

Over

Brownout

Temperature

Protection,

Protection

All

(OTP),

Pins

PWM Controller with PFC Standby Control

- 1 -

FEATURES

■

APPLICATIONS

Offline AC/DC flyback converter for

■

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

Laptop Power Adaptor

LCD Monitor Power

LCD TV Power and Home Appliance Power

Printer Power

Lighting Power

OB_DOC_DS_9800

Confidential

OB2298

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