OB2279 On-Bright Electronics, Inc., OB2279 Datasheet

OB2279

Manufacturer Part Number

OB2279

Description

Current Mode Pwm Controller

Manufacturer

On-Bright Electronics, Inc.

Datasheet

1.OB2279.pdf (1 pages)

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Company:

Meier Automation Equipment Co., Limited

Part Number:

OB2279

Manufacturer:

ON-BRIGHT/昂宝

Quantity:

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OB2279AP

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TDK

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Part Number:

OB2279AP

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ON-BRIGHT/昂宝

Quantity:

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OB2279CPA-T

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GENERAL DESCRIPTION

OB2279 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

externally programmable and 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.

VDD low startup current and low operating current

contribute to a reliable power on startup design with

OB2279. A large value resistor could thus be used in

the startup circuit for reduced power loss.

The internal slope compensation improves system

large signal stability and reduces the possible sub-

harmonic oscillation at high PWM duty cycle output.

Leading-edge blanking on current sense input

removes the signal glitch due to snubber circuit diode

reverse recovery and greatly reduces the external

component count and system cost in the design.

OB2279 offers comprehensive protection coverage

including Cycle-by-Cycle current limiting(OCP),

VDD Under Voltage Lockout(UVLO), VDD Over

Voltage Protection(OVP), VDD Clamp, Gate Clamp,

Over Load protection(OLP) and Over Temperature

protection (OTP).

OB2279 offers 3 different version with selective

protections set as latch shutdown mode. V version

OB2279 has OVP Latch shutdown only. T version

OB2279 supports both OVP and OTP latch shutdown.

L version OB2279 provides all OVP, OTP and OLP

latch shutdown control.

Excellent EMI performance is achieved with On-

Bright proprietary frequency shuffling technique

together with soft switching control at the totem pole

gate drive output.

TYPICAL APPLICATION

©On-Bright Electronics

Current Mode PWM Controller

- 1 -

Tone energy at below 20KHZ is minimized in

operation. Consequently, audio noise is eliminated

during operation.

OB2279 is offered in SOP-8 and DIP-8 packages.

FEATURES

■

APPLICATIONS

Offline AC/DC flyback converter for

■

o VDD Over Voltage Protection(OVP) - Latch

o Over Temperature Protection(OTP) – Auto

o Over Load Protection. (OLP) – Auto recovery

o VDD Under Voltage Lockout with Hysteresis

o Gate Output Voltage Clamp (16.5V)

o Built-in OCP Slope Compensation to Achieve

On-Bright

Technology for Improved EMI Performance

Power On Soft Start

Extended Burst Mode Control For Improved

Efficiency and Minimum Standby Power Design

Audio Noise Free Operation

External

Frequency

Internal Synchronized Slope Compensation

Low VIN/VDD Startup Current(3uA) and Low

Operating Current (2.3mA)

Leading Edge Blanking on Current Sense Input

Complete Protection Coverage with selective

protections on Latch Shutdown

Adaptor

Notebook Adaptor

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

Supplies

Open-frame SMPS

Printer Power

recovery or Latch

or Latch

(UVLO)

Minimum OPP Variation over universal AC

input.

Programmable

Proprietary

Freq Shuffling with Latch Shutdown

Frequency

PWM

OB_DOC_DS_7903

Confidential

OB2279

Switching

Shuffling

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