深圳奥科迪科技有限公司：主营各种厂家IC，广泛应用于高尖的电子设备。本经营部有多年的IC销售经验，能提供完整IC资料和完善售后服务；如果你有其它电子元件需要，还能配套你所需，尽量满足你的要求。始终秉承“诚信第一，质量第一，客户第一，合作双赢”的经营宗旨，以技术为依托、市场为导向。公司工装设备先进，检测手段完善，货源充足真实。专营：移动电源、锂电池充电、保护、升压、音频、LED驱动等多品牌IC芯片。代理日本三菱旗下IDC热销产品：M57962AL/L M57959L。地址:深圳福田区华强北华强广场D座21K。联系方式：企业QQ：2355504931 直线：0755-82956588/1342891193O 钟生。欢迎来电！
©On-Bright ElectronicsConfidential
- 1 -
OB_DOC_DS_63B2
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
