Enhanced High Power Factor Pre
regulator
UC1854A/B UC2854A/B UC3854A/B
FEATURES • Controls Boost PWM to Near Unity
Power Factor
• Limits Line Current Distortion To 3%
• World-Wide Operation Without Switches
• Accurate Power Limiting
• Fixed Frequency Average Current Mode Control
• High Bandwidth (5MHz), Low Offset Current Amplifier
• Integrated Current and Voltage Amp Output Clamps
• Multiplier Improvements: Linearity, 500mV VAC Offset (eliminates external resistor), 0-5V Multout Common Mode Range
• VREF "GOOD" Comparator
• Faster and Improved Accuracy ENABLE Comparator
• UVLO Threshold Options (16/10V / 10.
5/10V)
• 300µA Startup Supply Current
UVLO Turn on UVLO Turn off
UC1854A
16V
10...