OB2211 On-Bright Electronics, Inc., OB2211 Datasheet
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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
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
OB2211CG
Manufacturer:
ON/安森美
Quantity:
20 000
Part Number:
OB2211CP
Manufacturer:
ON/安森美
Quantity:
20 000
Company:
Part Number:
OB2211CPA
Manufacturer:
HOLTEK
Quantity:
1 020
Part Number:
OB2211CPA
Manufacturer:
ON/安森美
Quantity:
20 000
Part Number:
OB2211HCGA
Manufacturer:
ON/安森美
Quantity:
20 000
Part Number:
OB2211HCPA
Manufacturer:
ON/安森美
Quantity:
20 000
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
©On-Bright Electronics
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