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OB2301W Datasheet

High Performance synchronous rectifier

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OB2301W pdf
On-Bright Electronics Co., Ltd.
0755-82584090/83587431
OB2301W
High Performance synchronous rectifier
GENERAL DESCRIPTION
OB2301W is a high performance and tightly
integrated secondary side synchronous rectifier for
switch mode power supply system. It combines a
much lower voltage drop N-channel MOSFET to
emulate the traditional diode rectifier at the
secondary side of Flyback converter, which can
reduce heat dissipation, increases output current
capability and efficiency and simplify thermal
design. OB2301W can support low system output
voltage down to 2V at constant current mode.
It is suitable for multiple mode applications
including discontinuous conduction mode and
quasi-resonant mode. With its versatility and
optimization, OB2301W can be used in various
switch mode power supply topologies including
secondary-side control topology and primary-side
control topology.
From the information on the secondary side of the
isolation transformer, OB2301W generates a
driving signal with dead time with respect to the
primary side PWM signal to turn the integrated N-
channel SR switch on and off in proximity of the
zero current transition with the help of smart driver
voltage control. It is optimized for 5V output
voltage. In primary-side control topology,
OB2301W can detect the output voltage and feed
back a series of warning pulses to primary side
controller when the output voltage is lower than an
inner-determined threshold to awaken the primary-
side power switch to improve dynamic response.
The externally adjustable minimum on time and
property off time control scheme effectively avoid
the ring impact induced by parasitic elements so
that a reliable and noise free operation of the SR
system is insured.
OB2301W is offered in SOP8 package.
FEATURES
Secondary-side synchronous rectifier
optimized for 5V output system
Suitable for DCM, QR operation
Accurate secondary side MOSFET Vds
sensing
Low cost small size CC/CV mode support
Up to 200kHz operation frequency
3A/2A peak current sink/source driver
capability
Output voltage over-shoot and under-shoot
control
Enhanced dynamic response with firing
warning pulses scheme
VDD UVLO protection
APPLICATIONS
AC/DC 5V adaptors
Cell phone charger
5V Bias supply
Low voltage rectification circuits
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
1
Preliminary Datasheet
OB_DOC_DS_2301W01
On-Bright Electronics
On-Bright Electronics



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