Datasheet > OB2273

OB2273

更新时间： 2024-09-14 01:21:27

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
10页	384K
描述
High Performance Current Mode PWM Controller

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OB2273 数据手册

OB2273

High Performance Current Mode PWM Controller

GENERAL DESCRIPTION

FEATURES

OB2273 is a highly integrated current mode PWM

control IC optimized for high performance, low

standby power and cost effective offline flyback

converter applications.

PWM switching frequency at normal operation is

internally fixed and is trimmed to tight range. At no

load or light load condition, the IC operates in

extended ‘burst mode’ to minimize switching loss.

Lower standby power and higher conversion

efficiency is thus achieved.

■

Power on Soft Start Reducing MOSFET Vds

Stress

Frequency shuffling for EMI

Extended Burst Mode Control For Improved

Efficiency and Minimum Standby Power

Design

Audio Noise Free Operation

Fixed 65KHZ Switching Frequency

Comprehensive Protection Coverage

■

VDD Under Voltage Lockout with

Hysteresis (UVLO)

VDD low startup current and low operating current

contribute to a reliable power on startup and low

standby design with OB2273.

Cycle-by-cycle over current threshold

setting for constant output power limiting

over universal input voltage range

Overload Protection (OLP) with auto-

recovery

Over Temperature Protection (OTP) with

latch shut down

VDD Over voltage Protection(OVP) with

latch shut down

OB2273 offers complete protection coverage with

auto-recovery including Cycle-by-Cycle current

limiting (OCP), over load protection (OLP), and

VDD under voltage lockout (UVLO). It also

provides the protections with latched shut down

including over temperature protection (OTP), and

over voltage (fixed or adjustable) protection (OVP).

Excellent EMI performance is achieved with On-

Bright proprietary frequency shuffling technique.

The tone energy at below 20KHZ is minimized in

the design and audio noise is eliminated during

operation.

Adjustable OVP through external Zener

APPLICATIONS

Offline AC/DC flyback converter for

■

Battery Charger

Power Adaptor

Set-Top Box Power Supplies

Open-frame SMPS

OB2273 is offered in SOT23-6 package.

TYPICAL APPLICATION

©On-Bright Electronics

Confidential

Preliminary Datasheet

OB_DOC_DS_227302

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