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OB2276A Datasheet

High Performance Current Mode PWM Controller

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OB2276A
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2276A 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 OB2276A.
OB2276A offers complete protection coverage
with auto-recovery including Cycle-by-Cycle
current limiting (OCP), over load protection (OLP),
Brownout protection, VDD over voltage protection
(OVP), over temperature protection (OTP), output
over voltage protection and VDD under voltage
lockout (UVLO). 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.
OB2276A is offered in SOP8 package.
TYPICAL APPLICATION
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 VDD OVP with auto-recovery
o Over Temperature Protection with auto-
recovery
o Output Over Voltage Protection with auto-
recovery
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_2276A00
On-Bright Electronics
On-Bright Electronics



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