OB2273

High Performance Current Mode PWM Controller OB2273 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 OnBright proprietary frequency shuffling technique. The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. FEATURES ■ ■ ■ OB2273 is offered in SOT23-6 and DIP-8 package. TYPICAL APPLICATION On Br i ©On-Bright Electronics gh t Co nf id e Confidential -1- nt i APPLICATIONS Offline AC/DC flyback converter for ■ Battery Charger ■ Power Adapter ■ Set-Top Box Power Supplies ■ Open-frame SMPS al to Preliminary Datashee...