OB2358 Datasheet PDF - On-Bright Electronics

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OB2358
On-Bright Electronics

Part Number OB2358
Description Current Mode PWM Power Switch
Page 9 Pages


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OB2358
Current Mode PWM Power Switch Freq Shuffling
GENERAL DESCRIPTION
OB2358 combines a dedicated current mode PWM
controller with a high voltage power MOSFET. It
is optimized for high performance, low standby
power, and cost effective off-line flyback converter
applications in sub 27W range.
OB2358 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.
www.TDahteaStohneeete4Un.ecrogmy at below 20KHZ is minimized in the
design and audio noise is eliminated during operation.
OB2358 is offered in DIP8 package.
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 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
AC/DC adaptor
PDA power supplies
Digital Cameras and Camcorder Adaptor
VCR, SVR, STB, DVD&DVCD Player SMPS
Set-Top Box Power
Auxiliary Power Supply for PC and Server
Open-frame SMPS
TYPICAL APPLICATION
Output Power Table
406442781
Product
OB2358
230VAC±15%
Open Frame1
27W
85-265VAC
Open Frame1
16W
Notes:
1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50ambient.
©On-Bright Electronics
On-Bright Confidential to Microbridge
- 1 - OB_DOC_DS_5800



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OB2358
Current Mode PWM Power Switch Freq Shuffling
GENERAL INFORMATION
Pin Configuration
The OB2358 is offered in DIP8 package as shown
below.
www.DataSheet4U.com
Ordering Information
Part Number Description
OB2358AP DIP8, Pb-free
Package Dissipation Rating
Package
DIP8
RθJA (/W)
75
Note: Drain Pin Connected to 100mm2 PCB copper clad.
Absolute Maximum Ratings
Parameter
Drain Voltage (off state)
VDD Voltage
VDD-G Input Voltage
VDD Clamp Continuous
Current
FB Input Voltage
Sense Input Voltage
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (Soldering,
10secs)
Value
-0.3V to BVdss
-0.3V to 30 V
-0.3V to 30 V
10mA
-0.3 to 7V
-0.3 to 7V
-20 to 150
-55 to 150
260
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These are
stress ratings only, functional operation of the device at these or
any other conditions beyond those indicated under “recommended
operating conditions” is not implied. Exposure to absolute
maximum-rated conditions for extended periods may affect device
reliability.
Marking Information
©On-Bright Electronics
-2-
Confidential
OB_DOC_DS_5800



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OB2358
Current Mode PWM Power Switch Freq Shuffling
TERMINAL ASSIGNMENTS
Pin Name
GND
FB
VDD-G
SENSE
VDD
Drain
I/O Description
P Ground
I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and the current-sense signal at Pin 4.
P Internal Gate Driver Power Supply
I Current sense input
P IC DC power supply Input
O HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the
transformer
www.DaBtaLSOheCet4KU.cDomIAGRAM
©On-Bright Electronics
-3-
Confidential
OB_DOC_DS_5800



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OB2358
Current Mode PWM Power Switch Freq Shuffling
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
Istartup
VDD Start up
Current
I_VDD_Operation Operation Current
UVLO(ON)
VDD Under
Voltage Lockout
Enter
UVLO(OFF)
VDD Under
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Voltage Lockout
Exit (Recovery)
OVP(ON)
Over voltage
protection
voltage
VDD =14.5V,Measure
Leakage current into VDD
VFB=3V
CS=0V,FB=3V
Ramp up VDD until gate
clock is off
5 20 uA
1.6 mA
8.7 9.7 10.7 V
14.6 15.8 17.0 V
27.0 28.5 30.0 V
VDD_Clamp
VDD Zener Clamp IDD = 10 mA
Voltage
30 V
Feedback Input Section(FB Pin)
VFB_Open
VFB Open Loop
Voltage
IFB_Short
FB pin short
circuit current
Short FB pin to GND and
measure current
5.4 5.7 6.0 V
1.45 mA
VTH_0D
Zero Duty Cycle
FB Threshold
0.8 V
Voltage
VTH_PL
Power Limiting
FB Threshold
3.7 V
Voltage
TD_PL
Power limiting
Debounce Time
50 mSec
ZFB_IN
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
0.72 0.77 0.82 V
Threshold Voltage
Oscillator
FOSC
f_Temp
Normal Oscillation
Frequency
Frequency
Temperature
Stability
45 50 55 KHZ
5%
©On-Bright Electronics
-4-
Confidential
OB_DOC_DS_5800



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