OB2263
Current Mode PWM Controller
Frequency Shuffling
GENERAL DESCRIPTION
OB2263 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications in sub 30W range.
PWM switching frequency at normal operation is
externally programmable and trimmed to tight range.
At no load or light load condition, 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
OB2263. 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.
OB2263 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). The Gate-drive output is clamped
to maximum 18V to protect the power MOSFET.
Excellent EMI performance is achieved with On-
Bright proprietary frequency shuffling technique
together with soft switching control at the totem pole
gate drive output.
Tone energy at below 20KHZ is minimized in the
design and audio noise is eliminated during operation.
OB2263 is offered in SOT23-6, SOP-8 and DIP-8
packages.
FEATURES
On-Bright Proprietary Frequency Shuffling
Technology for Improved EMI Performance.
■
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
■
Audio Noise Free Operation
■
External
Programmable PWM Switching
Frequency
■
Internal Synchronized Slope Compensation
■
Low VDD Startup Current and Low Operating
Current (1.4mA)
■
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
Gate Output Maximum Voltage Clamp (18V)
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)
■
APPLICATIONS
Offline AC/DC flyback converter for
■
Battery Charger
■
Power Adaptor
■
Set-Top Box Power Supplies
■
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential to Micro Bridge
OB_DOC_DS_63B5
OB2263
Current Mode PWM Controller
Frequency Shuffling
GENERAL INFORMATION
Pin Configuration
The OB2263 is offered in SOT23-6, DIP8 and SOP8
packages, shown as below.
Ordering Information
Part Number
OB2263MP
OB2263AP
OB2263CP
Description
SOT23-6, Pb-free
DIP8, Pb-free
SOP8, Pb-free
Package Dissipation Rating
RθJA
Package
(°C/W)
DIP8
SOP8
SOT23-6
90
150
200
Absolute Maximum Ratings
Parameter
Value
VDD DC Supply Voltage
30 V
VDD Zener Clamp
VDD_Clamp+0.1V
Note
Voltage
VDD DC Clamp Current
10 mA
V
FB
Input Voltage
-0.3 to 7V
V
SENSE
Input Voltage to
-0.3 to 7V
Sense Pin
V
RI
Input Voltage to RI Pin -0.3 to 7V
Min/Max Operating
-20 to 150
o
C
Junction Temperature T
J
Min/Max Storage
-55 to 160
o
C
Temperature T
stg
Note:
VDD_Clamp has a nominal value of 34V.
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.
©On-Bright Electronics
-2-
Confidential to Micro Bridge
OB_DOC_DS_63B5
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