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OB2269C PDF预览

OB2269C

更新时间: 2024-02-28 16:17:08
品牌 Logo 应用领域
其他 - ETC 控制器
页数 文件大小 规格书
13页 353K
描述
current mode pwm controller

OB2269C 数据手册

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OB2269C  
Current Mode PWM ControllerFrequency Shuffling  
The tone energy at below 20KHZ is minimized in  
operation. Consequently, audio noise performance is  
greatly improved.  
OB2269C is offered in both SOP-8 and DIP-8  
packages.  
GENERAL DESCRIPTION  
OB2269C is a highly integrated current mode PWM  
control IC optimized for high performance, low  
standby power and cost effective offline flyback  
converter applications.  
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  
OB2269C. 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. This greatly helps to reduce the  
external component count and system cost in  
application.  
OB2269C 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 clampe
at 18V to protect the power MOSFET.  
FEATURES  
On-Bright Proprietary Frequency Shuffling  
Technology for Improved EMI Performance  
Extended Burst Mode Control For Imved  
Efficiency and Minimum Standby Power Design  
Audio Noise Free Operation  
External Programmable PWM Switching  
Frequency  
Internal Synchronized Slope Compensation  
Low VIN/VDD Startup Current(6.5uA) and Low  
Operating Current (2.3mA)  
Leading Edge Blanking on Current Sense Input  
Complete Protection Coverage With Auto Self-  
Recovery  
o
o
o
External Prorammable Over Temperature  
Protection (OTP)  
With or Without On-chip VDD OVP for  
System OVP  
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)  
In OB2269C, OCP threshold slope is internally  
optimized to reach constant output power limit over  
universal AC input range.  
Excellent EMI performance is achved with On-  
Bright proprietary frequency shuffling technique  
together with soft switching control at the totem pole  
gate drive output.  
o
Over Load Protection. (OLP)  
APPLICATIONS  
Offline AC/DC flyback converter for  
Laptop Power Adaptor  
PC/TV/Set-Top Box Power Supplies  
Open-frame SMPS  
Battery Charger  
TYPICAL APPLICATION  
©On-Bright Electronics  
Confidential  
- 1 -  
OB_DOC_DS_69CC1  

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