LT1248IS#PBF

LT1248 is a power factor controller. It provides active power factor correction for universal off-line power systems. 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 approaches in both continuous and discontinuous modes of operation. It 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 widely 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
• Instantaneous overvoltage protection, input bias current is -25nA typ
• Minimal line current dead zone
• Typical 250µA start-up supply current
• Rejects line switching noise
• Synchronization capability
• Low quiescent current is 9mA
• Fast 1.5A peak current gate driver
• Operating temperature is -40°C to 125°C
• Packaging style is 16-lead narrow plastic SO

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