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PDF OB2353 Datasheet ( Hoja de datos )

Número de pieza OB2353
Descripción Low Power Off Line SMPS Switcher
Fabricantes On-Bright Electronics 
Logotipo On-Bright Electronics Logotipo

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OB2353 Hoja de datos, Descripción, Manual
OB2353
Low Power Off Line SMPS Switcher Freq Shuffling
GENERAL DESCRIPTION
OB2353 combines a dedicated current mode PWM
controller with integrated high voltage power
MOSFET .It is optimized for high performance
low standby power and cost effective offline flyback
converter applications in sub 10W range.
OB2353 PWM frequency operates in the fixed and
trimmed . At no load or light load the frequency is
internal adjusted, 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 design with
OB2353. A large value resistor could thus be used in
the startup circuit to minimize the standby power.
The internal slope compensation improves system
large signal stability and reduces the possible sub-
harmonic oscillation at high PWM duty cycle output.
Leading-edge blanking on current sense(CS) input
removes the signal glitch due to snubber circuit diode
reverse recovery and thus greatly reduces the external
component count and system cost in the design.
OB2353 offers complete protection coverage with
automatic self-recovery feature including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), VDD over voltage clamp and under voltage
lockout (UVLO). Excellent EMI performance is
achieved with On-Bright proprietary frequency
shuffling technique together with soft switching
control at the totem pole gate drive output.
The tone energy at below 20KHZ is minimized in the
www.DdaetasiSghneeat4nUd.caoumdio noise is eliminated during operation.
OB2353 is offered in SOP-8 package.
FEATURES
Optimized for sub 10W Applications
Single Chip 650V Sense FET Power Switch for
Package.
Soft Start with 4mS
Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
Audio Noise Free Operation
Fixed 50KHZ Switching Frequency
Internal Synchronized Slope Compensation
Low VDD Startup Current and Low Operating
Current
Leading Edge Blanking on Current Sense Input
Good Protection Coverage With Auto Self-
Recovery
o VDD Over Voltage Clamp and Under Voltage
Lockout with Hysteresis (UVLO)
o On-Bright Proprietary Line Input Compensated
Cycle-by-Cycle Over-current Threshold Setting
For Constant Output Power Limiting Over
Universal Input Voltage Range.
o Overload Protection (OLP).
o Over voltage Protection(OVP)
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
PDA power supplies
Digital Cameras
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_5301

1 page

OB2353 pdf
OB2353
Low Power Off Line SMPS Switcher Freq Shuffling
ELECTRICAL CHARACTERISTICS
(TA = 25OC if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
I_VDD_Startup VDD Start up
VDD =14.5V,Measure
5 20 uA
Current
Leakage current into VDD
I_VDD_Operation Operation Current VDD=16V, VFB=3V
1.6 mA
UVLO(ON)
VDD Under
8.7 9.7 10.7 V
Voltage Lockout
Enter
UVLO(OFF)
VDD Under
14.9 15.9 16.9 V
Voltage Lockout
Exit (Recovery)
OVP(ON)
Over voltage
VDD=16V,CS=0V,FB=3V 28.5 30 31.5 V
protection
Ramp up VDD until gate
voltage
clock is off
VDD_Clamp
VDD Zener Clamp IDD = 10 mA
Voltage
31 32 33 V
Feedback Input Section(FB Pin)
VFB_Open
VFB Open Loop
Voltage
IFB_Short
FB pin short
circuit current
VTH_0D
Zero Duty Cycle
FB Threshold
Voltage
VTH_PL
Power Limiting
FB Threshold
Voltage
Short FB pin to GND and
measure current
VDD=16V
5.4 5.7 6.0 V
1.45 mA
0.8 V
3.7 V
TD_PL
Power limiting
Debounce Time
50 mSec
www.DaZtaFSBh_eIeNt4U.com
Input Impedance
4 Kohm
Current Sense Input(Sense Pin)
Soft start time
4 ms
T_blanking
Leading edge
270 ns
blanking time
ZSENSE_IN
TD_OC
Input Impedance
Over Current
Detection and
From Over Current Occurs
till the Gatedrive output start
40
120
Kohm
nSec
Control Delay
to turn off
VTH_OC
Internal Current
Limiting
FB=3.3V
VDD=16V
0.72 0.77 0.82 V
Threshold Voltage
Oscillator
FOSC
f_Temp
f_VDD
Normal Oscillation
Frequency
Frequency
Temperature
Stability
Frequency Voltage
Stability
VDD = 16V
VDD = 16V
VDD = 16-20V
45 50 55 KHZ
5%
5%
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_5301

5 Page

OB2353 arduino
OB2353
Low Power Off Line SMPS Switcher Freq Shuffling
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 applications 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.
www.DataSheet4U.com
©On-Bright Electronics
- 11 -
Confidential
OB_DOC_DS_5301

11 Page


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