LT1249CN8#PBF

LT1249 is a power factor controller. It provides active power factor correction for universal offline power systems with very few external parts. By using fixed high frequency PWM current averaging without the need for slope compensation, this device achieves far lower line current distortion, with a smaller magnetic element than systems that use either peak current detection or zero current switching approach, in both continuous and discontinuous modes of operation. This device uses a multiplier containing a square gain function from the voltage amplifier to reduce the AC gain at light output load and thus maintains low line current distortion and high system stability. It also provides filtering capability to reject line switching noise which can cause instability when fed into the multiplier. It is used in application such as universal power factor corrected power supplies, preregulators upto 1500W etc.

• High power factor over wide load range with line current averaging
• International operation without switches
• Instantaneous overvoltage protection
• Minimal line current dead zone
• Rejects line switching noise
• Synchronization capability
• Low quiescent current is 9mA typical at (11.5V ≤ VCC ≤ VMAX, CAOUT = 1V)
• Peak current gate driver is 1.5A typical
• Operating temperature is 0°C to 100°C
• Package style is 8-lead PDIP

注释

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