OB2358L Datasheet PDF - On-Bright Electronics

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OB2358L
On-Bright Electronics

Part Number OB2358L
Description Current Mode PWM Power Switch
Page 10 Pages


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OB2358L
Current Mode PWM Power Switch Frequency Shuffling
Product Specification
GENERAL DESCRIPTION
OB2358L 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.
OB2358L offers complete protection coverage
with automatic self-recovery feature including
Cycle-by-Cycle current limiting (OCP), over load
protection (OLP), over temperature protection
(OTP), over voltage protection and VDD 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 design and audio noise is eliminated during
operation.
OB2358L is offered in DIP8 package.
APPLICATIONS
Offline AC/DC flyback converter for
AC/DC adapter
PDA power supplies
Digital Cameras and Camcorder Adapter
VCR, SVR, STB, DVD&DVCD Player SMPS
Set-Top Box Power
Auxiliary Power Supply for PC and Server
Open-frame SMPS
TYPICAL APPLICATION
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 Under Voltage Lockout with Hysteresis
(UVLO)
o Over Temperature Protection (OTP)
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)
Output Power Table
Product
OB2358L
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 50
ambient. Higher output power is possible with extra added heat sink or air circulation to reduce thermal resistance.
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2358LA1



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OB2358L
Current Mode PWM Power Switch Frequency Shuffling
GENERAL INFORMATION
Pin Configuration
The OB2358L is offered in DIP8 package as
shown below.
Ordering Information
Part Number Description
OB2358LAP 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
FB Input Voltage
Sense Input Voltage
Maximum 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
-0.3 to 7V
-0.3 to 7V
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
Confidential
-2-
Datasheet
OB_DOC_DS_2358LA1



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OB2358L
Current Mode PWM Power Switch Frequency 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
BLOCK DIAGRAM
VDD
2
Internal supply
5V
RQ
S
UVLO POR
OVP
Burst
mode
RCeuferrreenntce OTP
Soft
Driver
VDD_G
1
Drain
5/6
Power
MOSFET
OSC
Extended
Burst mode
CPL Vth
Soft Start
OCP
Slope
compensation
SENSE
4
LEB
5.7V
PWM Comparator
50ms
OLP
7/8 GND
R FB
3
R
©On-Bright Electronics
Confidential
-3-
Datasheet
OB_DOC_DS_2358LA1



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OB2358L
Current Mode PWM Power Switch Frequency Shuffling
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=16V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
Istartup
VDD Start
Current
I_VDD_Operation
Operation
Current
up VDD=11V,Measure
Leakage current into VDD
VFB=3V
5 20
1.6
uA
mA
UVLO(ON)
VDD
Under
Voltage Lockout
Enter
5.8 6.8 7.8 V
UVLO(OFF)
VDD
Under
Voltage Lockout
Exit (Recovery)
11.5 12.5 13.5 V
OVP(ON)
Over
voltage
protection voltage
CS=0V,FB=3V
Ramp up VDD until gate
clock is off
22.0
23.5
25.0
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
4.6
4.9 5.2
1.15
V
mA
VTH_0D
Zero Duty Cycle
FB Threshold
Voltage
0.8 V
VTH_PL
Power Limiting
FB Threshold
Voltage
3.7 V
TD_PL
Power limiting
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(Sense Pin)
Soft start time
50 mSec
4 Kohm
4 ms
T_blanking
ZSENSE_IN
TD_OC
VTH_OC
Leading edge
blanking time
Input Impedance
Over
Current
Detection and
Control Delay
Internal Current
Limiting
Threshold
Voltage
From Over Current Occurs
till the Gatedrive output
start to turn off
FB=3.3V
0.72
270
40
80
0.77
0.82
ns
Kohm
nSec
V
Oscillator
FOSC
Normal
Oscillation
Frequency
45 50 55 KHZ
f_Temp
Frequency
Temperature
Stability
5%
f_VDD
D_max
Frequency
Voltage Stability
Maximum duty
cycle
FB=3.3V, CS =0V
5%
56 66 76 %
©On-Bright Electronics
Confidential
-4-
Datasheet
OB_DOC_DS_2358LA1



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