器件名称:
LM5021NA-2
功能描述:
AC-DC Current Mode PWM Controller
文件大小:
746.98KB 共15页
简 介:
LM5021 AC-DC Current Mode PWM Controller May 2005 LM5021 AC-DC Current Mode PWM Controller General Description The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 A) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR , CECP, etc.). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100nS and a 1MHz capable oscillator that is programmed with a single resistor. Features n n n n n n n n n n n n n n n Ultra Low Start-up Current (25 A maximum) Current Mode Control Skip Cycle Mode for Low Standby Power Single Resistor Programmable Oscillator Synchronizable Oscillator Adjustable Soft-start Integrated 0.7A Peak Gate Driver Direct Opto-Coupler Interface Maximum Duty Cycle Limiting (80% for LM5021-1 or 50% for LM5021-2) Slope Compensation for (LM5021-1 Only) Under Voltage Lockout (UVLO) with Hysteresis Cycle-by-Cycle Over-Current Protection Hiccup Mode for Continuous Overload Protection Leading Edge Blanking of Current Sense Signal Pack……
