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PDF OB2301W Data sheet ( Hoja de datos )
| Número de pieza | OB2301W | |
| Descripción | High Performance synchronous rectifier | |
| Fabricantes | On-Bright Electronics | |
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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
1 page  
On-Bright Electronics Co., Ltd.
0755-82584090/83587431
OB2301W
WHigh Performance Synchronous Rectifier
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=5V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
I_VDD_operation Operation current
Frequency@Vd=65KHz,VD
D=5V,1nF Cap load at
GATE.
Frequency@Vd=2KHz,VDD
=5V,No load at GATE.
1.5 2.0 mA
0.5 0.7 mA
Vdd_regulation_mini
Minimum
voltage
Vdd
regulation
4.2 V
UVLO(ON)
VDD Under Voltage Lockout
Entry
2.8 3.0 3.2 V
UVLO(OFF)
VDD Under Voltage Lockout
Exit (Recovery)
2.9 3.1 3.3 V
VD Detection Section
Vth_SR_act
SR MOSFET turn on threshold
voltage detection at VD
-350
mV
Vth_SR_deact
SR MOSFET turn off threshold
voltage detection at Vd
-5 mV
Tdelay_on
SR MOSFET
propagation delay
turn-on
100 ns
Tdelay_off
SR MOSFET
propagation delay
turn-off
75 ns
T_minimum_on
SR MOSFET minimum on time RT=25KΩ
1.9 Us
RT Section
Vrt Voltage reference at RT pin
Over/Under Shoot Control Section
Vo_delta
Output delta variation in system
output undershoot control
Vo_delta_enb
Output delta variation detection
enable voltage
Fsample
Output delta variation detection
Sample frequency
Vo_low_clamp
Vo_High_clamp
IVo_High_clamp
Dsr_pulse
Fsw
Tdelay
System output undershoot
clamp control trigger voltage
System output overshoot clamp
control trigger voltage
System output overshoot clamp
current
Warning signal pulse width
when
system
output
undershoot is detected
Warning signal frequency when
system output undershoot is
detected
Warning signal blanking time
after
secondary-side
0.95 1 1.05 V
160 mV
5.25 V
15 KHz
4.5 4.6 4.7 V
5.8 V
70 mA
800 nS
27 30 33 KHz
65 us
©On-Bright Electronics
Confidential
5
Preliminary Datasheet
OB_DOC_DS_2301W01
5 Page 
On-Bright Electronics Co., Ltd.
0755-82584090/83587431
OB2301W
WHigh Performance Synchronous Rectifier
IMPORTANT NOTICE
RIGHT TO MAKE CHANGES
On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements,
improvements and other changes to its products and services at any time and to discontinue any product
or service without notice. Customers should obtain the latest relevant information before placing orders
and should verify that such information is current and complete.
WARRANTY INFORMATION
On-Bright Electronics Corp. warrants performance of its hardware products to the specifications
applicable at the time of sale in accordance with its standard warranty. Testing and other quality control
techniques are used to the extent it deems necessary to support this warranty. Except where mandated
by government requirements, testing of all parameters of each product is not necessarily performed.
On-Bright Electronics Corp. assumes no liability for application assistance or customer product design.
Customers are responsible for their products and applications using On-Bright’s components, data sheet
and application notes. To minimize the risks associated with customer products and applications,
customers should provide adequate design and operating safeguards.
LIFE SUPPORT
On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to
support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or
claims resulting from the use of its products in medical applications.
MILITARY
On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright
Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in
military applications.
©On-Bright Electronics
Confidential
11
Preliminary Datasheet
OB_DOC_DS_2301W01
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet OB2301W.PDF ] | |
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