OB2273A Datasheet PDF learn more.
Part number : OB2273A
Functions : This is a kind of semiconductor, High Performance Current Mode PWM Controller.
Pin arrangement :
Package information :
Manufacturer : On-Bright
The texts in the PDF file :
OB2273A High Performance Current Mode PWM Controller GENERAL DESCRIPTION OB2273A 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 OB2273A. OB2273A offers complete protection coverage with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VDD under voltage lockout (UVLO), 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. OB2273A is offered in SOT23-6 package. FEATURES ■ Level 5 compliance with <100mW standby power at universal AC input. ■ Power on Soft Start Reducing MOSFET Vds Stress ■ Frequency shuffling for EMI ■ Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design ■ Audio Noise Free Operation ■ Fixed 65KHZ Switching Frequency ■ Comprehensive Protection Coverage o VDD Under Voltage Lockout with Hysteresis (UVLO) o Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range o Overload Protection (OLP) with autorecovery o Over Temperature Protection (OTP) with auto-recovery o VDD Over voltage Protection(OVP) with auto-recovery o Adjustable OVP through external Zener APPLICATIONS Offline AC/DC flyback converter for ■ Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies ■ Op [ ... ]
OB2273A PDF File