Datasheet > OB2211

OB2211

更新时间： 2024-09-26 00:04:27

品牌	Logo	应用领域
其他 - ETC		开关
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11页	337K
描述
Primary-Side Regulation PWM Power Switch

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OB2211 数据手册

OB2211/OB2212

Primary-Side Regulation PWM Power Switch

FEATURES

Primary-side Sensing and Regulation With No

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

GENERAL DESCRIPTION

OB2211/OB2212 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 from design. 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/OB2212 offers power on soft start control

and complete 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 with No-Y cap design.

APPLICATIONS

Low Power AC/DC offline SMPS for

Cell Phone Charger

Digital Cameras Charger

Small Power Adaptor

Auxiliary Power for PC, TV etc.

Linear Regulator/RCC Replacement

OB2211 is offered in SOP8 package.

OB2212 is offered in DIP8 package

Fig 1. Typical CC/CV Curve

TYPICAL APPLICATION

©On-Bright Electronics

Confidential

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