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BUY UCC3818ADRG4 https://www.utsource.net/itm/p/5345800.html
BiCMOS POWER FACTOR PREREGULATOR
Description: The UCC3818 is a current-mode PWM controller designed for off-line and DC-to-DC converter applications. Features: Low Start-up Current Internal Soft-Start Internal Slope Compensation Internal Leading Edge Blanking Internal Undervoltage Lockout Internal Thermal Shutdown Internal Current Limit Internal Frequency Compensation Internal Overvoltage Protection Wide Operating Voltage Range: 4.5V to 38V Low Standby Power Consumption Applications: Off-line and DC-to-DC Converters Uninterruptible Power Supplies Switching Regulators Battery Chargers Motor Controls (For reference only)