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OB2263 PDF预览

OB2263

更新时间: 2024-11-14 00:04:27
品牌 Logo 应用领域
其他 - ETC 控制器
页数 文件大小 规格书
14页 369K
描述
current mode pwm controller

OB2263 数据手册

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OB2263  
Current Mode PWM ControllerFrequency Shuffling  
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  
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.  
packages.  
FEATURES  
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.  
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  
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 totm pole  
gate drive output.  
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
o
Gate Output Maximum Voltage Clamp (18V)  
On-Bright Proprietary Line Input Compensated  
Cycle-by-Cycle Over-current Threshold Setting  
FoConstant 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  
Confidential  
- 1 -  
OB_DOC_DS_63B2  

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