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OB2288 Datasheet

Highly Integrated Current Mode PWM Controller

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OB2288
Highly Integrated Current Mode PWM Controller
GENERAL DESCRIPTION
OB2288 is a highly integrated current mode PWM
controller. With internal maximum 50% duty cycle
limit, it is very suitable to be used in large power
applications, especially in forward topology.
OB2288 offers comprehensive protection coverage
including Cycle-by-Cycle current limiting, internal
Power-On Soft Start, VDD Under Voltage Lockout
(UVLO), VDD Over Voltage Protection(OVP), VDD
Clamp, Gate Clamp, Over Load Protection(OLP),
Over Temperature Protection (OTP), Brownout
Protection (BOP). OB2288 also features protections
against pin open and short conditions on selected
pins.
Moreover, an internal 1-second restart timer prevents
permanent OLP latch when the supply of the
controller is provided by other DC sources. In
general applications where supply is self biased by
auxiliary winding, this restart timer will never be
triggered.
In OB2288, On-Bright proprietary frequency
shuffling technique together with soft switching
control at the totem pole gate drive output help to
lower the system design barrier to achieve good EMI
performance.
To meet the increasing stringent standby power
requirements at light or no load condition, On-Bright
proprietary “Extended Burst Mode” technology eases
the system design with high performance and without
compromise in audio noise.
OB2288 is offered in SOP-8 and DIP-8 packages.
FEATURES
Maximum 50% Duty Cycle Limit
AC Line Brownout Detection & Protection (BOP)
Latch-off Mode Fault Protection
Internal Restart Timer
All Pins Floating Protection and RI Short
Protection
Proprietary Extended Burst Mode Control For
Improved Efficiency and Minimum Standby
Power Design
Audio Noise Free Operation
External Programmable PWM Switching
Frequency
Built-in Frequency Shuffling for Better EMI
Internal Leading Edge Blanking
High Precision Reference Voltage for OTP and
Brownout Protection
Power-On Soft Start
Internal Synchronized Slope Compensation
1A Peak Current Drive Capability
APPLICATIONS
Offline AC/DC Converter for
LCD TV/PC Power Supplies
Open-Frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_8800
Free Datasheet http://www.datasheetlist.com/
On-Bright Electronics
On-Bright Electronics



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