Datasheet > OB2203

OB2203

更新时间： 2024-09-26 05:34:43

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昂宝

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OB2203 数据手册

OB2203

http://www.elecfans.com 电子发烧友 http://bbs.elecfans.com 电子技术论坛

Quasi-Resonant Flyback PWM Controller

GENERAL DESCRIPTION

FEATURES

OB2203 is a highly integrated Quasi-Resonant (QR)

controller optimized for high performance offline

flyback converter applications.

■

Multi-Mode Operation

Quasi-Resonant Operation at Normal Loading

Pulse Frequency Modulation (PFM) Operation at

Light Load

At normal load condition, it operates in QR mode

with minimum drain voltage switching. To meet the

CISPR-22 EMI starting at 150KHz, the maximum

switching frequency is internally limited to 130KHz.

It operates in PFM mode for high power conversion

efficiency at light load condition. When the loading is

very small, the IC operates in ‘Extended Burst Mode’

to minimize the switching loss. As a result, lower

standby power consumption and higher conversion

efficiency is achieved.

A built-in P-channel MOSFET and its control are

integrated to automatically turn on or off PFC stage

according to the load conditions. When used with

OB6563 (On-Bright’s PFC controller), the standby

power consumption of less than 400mW can be

achieved in typical 150W SMPS.

■

Burst Mode at No Load

Direct Control of the Power Supply of PFC

Controller for Improved Standby Power at

No/Light Load

■

40KHz Minimum Frequency Limit at QR Mode

130KHz Maximum Frequency Limit

Internal Minimum T_off for Ringing Suppression

45us Maximum On Time Limit

Adaptive Slope Compensation

Internal Leading Edge Blanking

Programmable Soft-start

External Latch Triggering

Internal Temperature Shutdown

1A Peak Current Sink/Source Capability

Programmable Over Voltage Protection (OVP)

OB2203 offers comprehensive protection coverage

including Cycle-by-Cycle Current Limiting(OCP),

VCC Under Voltage Lockout(UVLO), Over Voltage

Protection(OVP), VCC Clamp, Gate Clamp, Over

Load Protection(OLP), On-chip Thermal Shutdown,

APPLICATIONS

Offline AC/DC flyback converter for

■

Power Adaptor and Open-frame SMPS

LCD Monitor/TV/PC/Set-Top Box Power

Supplies

Programmable Soft Start,

and External Latch

■

Triggering, Max On-time Limit, etc.

OB2203 is offered in SOP-8 and DIP-8 packages.

■

NB/DVD/Portable DVD Power Supplies

TYPICAL APPLICATION

©On-Bright Electronics

Confidential

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