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OB2269CP

更新时间： 2024-01-12 06:01:54
品牌 Logo 应用领域
台湾光宝 - LITEON /
页数 文件大小 规格书
12页 254K
描述
Current Mode PWM Controller

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OB2269CP 数据手册

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OB2268  
OB2269  
Current Mode PWM Controller  
OB2268/9 is offered in SOP-8 and DIP-8 packages.  
GENERAL DESCRIPTION  
FEATURES  
OB2268/9 is a highly integrated current mode PWM  
control IC optimized for high performance, low  
standby power and cost effective offline flyback  
converter applications in above 20W power level.  
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  
OB2268/9. 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 input  
removes the signal glitch due to snubber circuit diode  
reverse recovery. and greatly reduces the external  
component count and system cost in the design.  
OB2268/9 offers complete protection coverage with  
automatic self-recovery feature including Cycle-by-  
Cycle current limiting (OCP), over load protection  
(OLP), over temperature protection (OTP), VDD  
over voltage protection (OVP) 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  
(OB2269 only) together with soft switching control at  
the totem pole gate drive output.  
■
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 VIN/VDD Startup Current(4uA) and Low  
Operating Current (2.3mA)  
■
■
Leading Edge Blanking on Current Sense Input  
Complete Protection Coverage With Auto Self-  
Recovery  
o
o
o
External Programmable Over Temperature  
Protection (OTP)  
With or Without On-chip VDD OVP for  
Output Over Voltage Protection.  
Under Voltage Lockout with Hysteresis  
(UVLO)  
o
o
Gate Output Maximum Voltage Clamp (18V)  
Line Compensated Cycle-by-Cycle Over-  
current Threshold Setting For Constant Output  
Current Limiting Over Universal Input Voltage  
Range (OCP)  
o
Over Load Protection. (OLP)  
■
On-Bright Proprietary Frequency Shuffling  
Technology for Improved EMI Performance  
(OB2269 only)  
APPLICATIONS  
Offline AC/DC flyback converter for  
■
■
■
■
Laptop Power Adaptor  
PC/TV/Set-Top Box Power Supplies  
Open-frame SMPS  
The tone energy at below 20KHZ is minimized in  
operation. Consequently, audio noise performance is  
greatly improved.  
Battery Charger  
TYPICAL APPLICATION  
©On-Bright Electronics  
Confidential  
A Liteon Semiconductor Company  
- 1 -  
V2.1  
1234567...12

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