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OB2211

Primary-Side Regulation PWM Power Switch



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OB2211 pdf
OB2211/OB2212
Primary-Side Regulation PWM Power Switch
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.
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
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
On-Bright Confidential to MicroBridge
-1-
OB_DOC_DS_1100



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OB2211 pdf
OB2211/OB2212
Primary-Side Regulation PWM Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOP8 and DIP8.
Ordering Information
Part Number Description
OB2211CP
SOP8, Pb-free, Tube
OB2211CPA
SOP8, Pb-free, T&R
OB2212AP
DIP8, Pb-free
Absolute Maximum Ratings
Parameter
Drain Voltage (off state)
VDD Voltage
VDDG Voltage
VDD Zener Clamp Continuous
Current
CS Input Voltage
INV Input Voltage
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (Soldering,
10secs)
Value
-0.3V to 650V
-0.3 to 33 V
-0.3 to 33 V
10 mA
-0.3 to 7V
-0.3 to 7V
-20 to 150 oC
-55 to 150 oC
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These are
stress ratings only, functional operation of the device at these or
any other conditions beyond those indicated under “recommended
operating conditions” is not implied. Exposure to absolute
maximum-rated conditions for extended periods may affect device
reliability.
OB2211 X X X
Primary-Side Regulation PWM Power
Switch
Package
C:SOP8
Package Pb-free
P : Lead Free
Packing
Blank : Tube
A : Taping
©On-Bright Electronics
On-Bright Confidential to MicroBridge
-2-
OB_DOC_DS_1100



Part Number OB2211
Description Primary-Side Regulation PWM Power Switch
Maker On-Bright - On-Bright
Total Page 10 Pages
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