OB2263 On-Bright Electronics, Inc., OB2263 Datasheet
OB2263
Manufacturer Part Number
OB2263
Description
Current Mode Pwm Controller
Manufacturer
On-Bright Electronics, Inc.
Datasheet
1.OB2263.pdf
(1 pages)
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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.
TYPICAL APPLICATION
©On-Bright Electronics
Current Mode PWM Controller
- 1 -
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
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APPLICATIONS
Offline AC/DC flyback converter for
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o VDD Over Voltage Clamp and Under Voltage
o Gate Output Maximum Voltage Clamp (18V)
o On-Bright Proprietary Line Input Compensated
o Overload Protection (OLP)
On-Bright
Technology for Improved EMI Performance.
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
Audio Noise Free Operation
External
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
Battery Charger
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS
Lockout with Hysteresis (UVLO)
Cycle-by-Cycle Over-current Threshold Setting
For Constant Output Power Limiting Over
Universal Input Voltage Range.
Programmable
Proprietary
Frequency
PWM
Frequency Shuffling
OB_DOC_DS_63B2
Confidential
OB2263
Switching
Shuffling
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