OB2211 On-Bright Electronics, Inc., OB2211 Datasheet

OB2211

Manufacturer Part Number

OB2211

Description

Primary-side Regulation Pwm Power Switch

Manufacturer

On-Bright Electronics, Inc.

Datasheet

1.OB2211.pdf (1 pages)

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

OB2211CG

Manufacturer:

ON/安森美

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

OB2211CP

Manufacturer:

ON/安森美

Quantity:

20 000

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Bonase Electronics (HK) Co., Limited

Part Number:

OB2211CPA

Manufacturer:

HOLTEK

Quantity:

1 020

Company:

BOSTOCK HK LIMITED

Part Number:

OB2211CPA

Manufacturer:

ON-BRIGHT

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Company:

Meier Automation Equipment Co., Limited

Part Number:

OB2211CPA

Manufacturer:

ON/安森美

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

OB2211HCGA

Manufacturer:

ON/安森美

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

OB2211HCPA

Manufacturer:

ON/安森美

Quantity:

20 000

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GENERAL DESCRIPTION

OB2211 is an offline PWM Power switch for low

power AC/DC charger and adaptor applications. It

operates in primary-side sensing and regulation.

Consequently, opto-coupler and TL431 could be

eliminated. Proprietary Constant Voltage (CV) and

Constant Current (CC) control is integrated as shown

in the figure below.

In CC control, the current and output power setting

can be adjusted externally by the sense resistor Rs at

CS pin. In CV control, multi-mode operations are

utilized to achieve high performance and high

efficiency. Device operates in fixed frequency mode

at large load conditions, frequency reduction mode at

light/medium load and ‘Extended burst mode’ at

No/light load conditions.

OB2211 offers power on soft start control and

protection coverage with auto-recovery features

including Cycle-by-Cycle current limiting, VDD

over-voltage clamp and UVLO, fail-safe protection

for open loop fault condition. 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

Fig 1. Typical CC/CV Curve

Primary-Side Regulation PWM Power Switch

- 1 -

FEATURES

APPLICATIONS

Low Power AC/DC offline SMPS for

OB2211 is offered in SOP8 package.

Primary-side Sensing and Regulation Without

TL431 and Opto-coupler

Multi-mode Operation for High Efficiency

Programmable CV and CC Regulation

Adjustable Constant Current and Output Power

setting

Frequency Shuffling and Adjustable Gate Drive

Greatly Improving EMI

Power on Soft-start Time (4ms)

“Extended Burst Mode Control” for Improved

Efficiency and Minimum Standby Design

Built-in Leading Edge Blanking (LEB)

Cycle-by-Cycle Current Limiting

VDD Under Voltage Lockout with Hysteresis

(UVLO)

VDD Over Voltage Shutdown and Clamp

Auto-restart in Over Voltage condition

Fail-safe protection for open loop fault condition

Cell Phone Charger

Digital Cameras Charger

Small Power Adaptor

Auxiliary Power for PC, TV etc.

Linear Regulator/RCC Replacement

OB_DOC_DS_11A0

Confidential

OB2211

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