OB2252 On-Bright Electronics, Inc., OB2252 Datasheet

OB2252

Manufacturer Part Number

OB2252

Description

Current Mode Pwm Controller For Bjt

Manufacturer

On-Bright Electronics, Inc.

Datasheet

1.OB2252.pdf (1 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Allchip Electronic(HK) Limited

Part Number:

OB2252MP

Manufacturer:

On-Bright

Quantity:

11 877

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Download datasheet (130Kb)

GENERAL DESCRIPTION

OB2252 is a highly integrated current mode PWM

control IC optimized for high performance, low

standby power and cost effective off-line flyback

converter applications in sub 10W range.

PWM frequency is internal constant and it 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.

VDD low startup current and low operating current

contribute to a reliable power on startup design with

OB2252. A large value resistor could thus be used in

the startup circuit to minimize the standby power.

The internal slope compensation improves system

large signal stability and reduces the possible sub-

harmonic oscillation at higher than 50% PWM duty

cycle output. Leading-edge blanking on current

sense(CS) input removes the signal glitch due to

snubber circuit diode reverse recovery and thus

greatly reduces the external component count and

system cost in the design.

OB2252 offers complete protection coverage with

automatic self-recovery feature including Cycle-by-

Cycle current limiting (OCP), over load protection

(OLP), VDD over voltage clamp and under voltage

lockout (UVLO). Excellent EMI performance is

achieved with On-Bright proprietary frequency

shuffling technique together with soft switching

control at the totem pole Base drive output.

The tone energy at below 20KHZ is minimized in the

design and audio noise is eliminated during operation.

TYPICAL APPLICATION

©On-Bright Electronics

Current Mode PWM Controller for BJT

- 1 -

OB2252 is offered in SOT23-6, SOP-8 and DIP-8

packages.

FEATURES

■

APPLICATIONS

Offline AC/DC flyback converter for

■

o VDD Over Voltage Clamp and Under Voltage

o On-Bright Proprietary Line Input Compensated

o Overload Protection (OLP).

Optimized for sub 10W Application Driving

Power BJT

Soft Start with 4 mS

Frequency Shuffling for Improved EMI

Extended Burst Mode Control For Improved

Efficiency and Minimum Standby Power Design

Audio Noise Free Operation

Fixed 50KHZ Switching Frequency

Internal Synchronized Slope Compensation

Low VDD Startup Current and Low Operating

Current

Leading Edge Blanking on Current Sense Input

Good Protection Coverage With Auto Self-

Recovery

Battery Charger

PDA power supplies

Digital Cameras

Power Adaptor

Set-Top Box Power Supplies

Open-frame SMPS

Lockout with Hysteresis (UVLO)

Cycle-by-Cycle

Setting For Constant Output Power Limiting

Over Universal Input Voltage Range.

Over-current

OB_DOC_DS_5204

Confidential

Freq Shuffling

OB2252

Threshold

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