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OB5269B
High Voltage Green Mode PWM Controller with Brownout
GENERAL DESCRIPTION
OB5269B is a highly integrated current mode
PWM control IC with high voltage start up,
optimized for high performance, low standby
power consumption and cost effective offline
flyback converter applications.
PWM switching frequency at normal operation is
internally fixed and is trimmed to a tight range. At
no load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Very low standby power consumption and very
high conversion efficiency is thus achieved.
High voltage startup is implemented in OB5269B,
which features with short startup time and low
standby current.
OB5269B offers complete protection coverage
with auto-recovery including Cycle-by-Cycle
current limiting (OCP), over load protection (OLP),
brownout protection and VDD under voltage
lockout (UVLO). It also provides the protections
with latched shut down including over temperature
protection (OTP), and VDD over voltage protection.
Excellent EMI performance is achieved with On-
Bright proprietary frequency shuffling technique.
The tone energy at below 22KHZ is minimized to
avoid audio noise during operation.
OB5269B is offered in SOP8 package.
FEATURES
High Voltage Startup
Power on Soft Start Reducing MOSFET Vds
Stress
Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
o VDD Under Voltage Lockout with
Hysteresis (UVLO)
o Cycle-by-cycle over current protection
(OCP)
o Overload Protection (OLP) with auto-
recovery
o Brownout Protection with auto-recovery
o Over Temperature Protection (OTP) with
latch shut down
o VDD Over voltage Protection(OVP) with
latch shut down
Intelligent AC off Detect with X-cap discharge
function (On-Bright patent)
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adaptor
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_5269B03

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OB5269B
High Voltage Green Mode PWM Controller with Brownout
GENERAL INFORMATION
Pin Configuration
The OB5269B is offered in SOP8 package, shown
as below.
BO
FB
CS
GND
18
27
OB5269B
36
45
HV
NC
VDD
GATE
Ordering Information
Part Number
OB5269BCP
Description
SOP8, Pb-free
OB5269BCPA
SOP8, Pb-free in Taping
Package Dissipation Rating
Package
RJA(/W)
SOP8
150
Absolute Maximum Ratings
Parameter
VDD DC Supply Voltage
High-Voltage Pin, HV
VDD Zener Clamp
VoltageNote
VDD DC Clamp Current
FB Input Voltage
CS Input Voltage
BO Input Voltage
Min/Max Operating
Junction Temperature TJ
Min/Max Storage
Temperature Tstg
Lead
Temperature
(Soldering, 10secs)
Value
30V
-0.3 to 500 V
VDD_Clamp+0.1V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-40 to 150
-55 to 160
260
Note: VDD_Clamp has a nominal value of 32V.
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.
OB5269B X
X
X
High Voltage Green Mode PWM
Controller with Brownout
Package
C:SOP8
Package Pb free
P:lead-free
Packing
Blank:Tube
A:Taping
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_5269B03

No Preview Available !

Marking Information
OB5269B
High Voltage Green Mode PWM Controller with Brownout
YWWZZZ
OB5269CP
B
S
Y:Year Code
WW:Week Code(01-52)
ZZZ:Lot Code
C:SOP8 Package
P:Pb-free Package
B:Version
S:Internal Code(Optional)
TERMINAL ASSIGNMENTS
Pin
Num
1
2
3
4
5
6
8
Pin Name
BO
FB
CS
GND
Gate
VDD
HV
I/O Description
I Connected resistors for brownout protection
I
Feedback input pin. The PWM duty cycle is determined by voltage level
into this pin and the current-sense signal at CS pin
I Current sense input
P Ground
O Totem-pole gate driver output for power Mosfet
P Power Supply
P Connected to the line input or bulk capacitor via resistors for startup
RECOMMENDED OPERATING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Operating Ambient Temperature
Min/Max
12 to 23.5
-20 to 85
Unit
V
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_5269B03