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OB2273MP Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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OB2273MP Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 10 page  OB2273 High Performance Current Mode PWM Controller GENERAL DESCRIPTION OB2273 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 internally fixed and is 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 and low standby design with OB2273. OB2273 offers complete protection coverage with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), and VDD under voltage lockout (UVLO). It also provides the protections with latched shut down including over temperature protection (OTP), and over voltage (fixed or adjustable) protection (OVP). Excellent EMI performance is achieved with On- Bright proprietary frequency shuffling technique. The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. OB2273 is offered in SOT23-6 package. FE OSFET Vds ■ ■ Fixe ■ om (UVLO) ant output power limiting tion (OLP) with auto- o Over Temperature Protection (OTP) with oltage Protection(OVP) with VP through external Zener Offline AC/DC flyback converter for Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies ■ Open-frame SMPS TYPICAL APPLICATION ATURES Power o ■ n Soft Start Reducing M Stress ■ Frequency shuffling for EMI ■ Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power ign Des Audio Noise Free Operation d 65KHZ Switching Frequency prehensive Protection Coverage C o VDD Under Voltage Lockout with Hysteresis o Cycle-by-cycle over current threshold setting for const over universal input voltage range Overload Protec o recovery latch shut down o VDD Over v latch shut down o Adjustable O APPLICATIONS ■ ©On-Bright Electronics Confidential Preliminary Datasheet OB_DOC_DS_227302 - 1 - |
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