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OB2276
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2276 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications.
PWM switching frequency at normal operation is
internally fixed and 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 and low
standby design with OB2276.
OB2276 offers complete protection coverage with
auto-recovery including Cycle-by-Cycle current
limiting (OCP), over load protection (OLP),
Brownout protection, and VDD under voltage
lockout (UVLO). It also provides latch shut down
mode protection include fixed/adjustable VDD
over voltage protection (OVP), over temperature
protection (OTP) and output over voltage
protection. Excellent EMI performance is achieved
with On-Bright proprietary frequency shuffling
technique.
The tone energy at below 22KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2276 is offered in SOP8 package.
FEATURES
Power on Soft Start Reducing MOSFET Vds
Stress
Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
o VDD Under Voltage Lockout with
Hysteresis (UVLO)
o Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o Overload Protection (OLP) with auto-
recovery
o Brownout Protection with auto-recovery
o Fixed VDD OVP with latch shut down
o Adjustable VDD OVP with latch shut
down
o Over Temperature Protection with latch
shut down
o Output Over Voltage Protection with latch
shut down
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_227601

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OB2276
High Performance Current Mode PWM Controller
GENERAL INFORMATION
Pin Configuration
The OB2276 is offered in SOP8 package, shown
as below.
VCC
1
8 Demag
GND
2
7 FB
GATE 3
6 RT
CS 4
5 BO
Ordering Information
Part Number
OB2276CP
Description
SOP8, Pb-free in Tube
OB2276CPA
SOP8, Pb-free in T&R
Package Dissipation Rating
Package
RJA(/W)
SOP8
150
Absolute Maximum Ratings
Parameter
VDD DC Supply Voltage
Value
VOVP-1V
VDD Zener Clamp
VoltageNote
VDD DC Clamp Current
FB Input Voltage
Sense Input Voltage
BO Input Voltage
VDD_Clamp+0.1V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
RT Input Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ
Min/Max Storage
Temperature Tstg
-40 to 150
-55 to 150
Lead Temperature
(Soldering, 10secs)
260
Note: VDD_Clamp has a nominal value of 34V.
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.
OB2276 X X X
Current Mode PWM Controller with
brownout
Package
C:SOP8
Package Pb-free
P:Pb-free
Packing
Blank:Tube
A: Tape/Reel
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_227601