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UCC38050

Features: · Transition Mode PFC Controller for Low Implementation Cost· Industry Pin Compatibility With Improved Feature Set· Improved Transient Response With Slew-Rate Comparator· Zero Power Detect to Prevent OVP During Light Load Conditions· Accurate Internal VREF for Tight Output Regulation· Tw...

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SeekIC No. : 004535986 Detail

UCC38050: Features: · Transition Mode PFC Controller for Low Implementation Cost· Industry Pin Compatibility With Improved Feature Set· Improved Transient Response With Slew-Rate Comparator· Zero Power Detect...

UCC38050 Data Sheet

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Part Number:
UCC38050
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

· Transition Mode PFC Controller for Low Implementation Cost
· Industry Pin Compatibility With Improved Feature Set
· Improved Transient Response With Slew-Rate Comparator
· Zero Power Detect to Prevent OVP During Light Load Conditions
· Accurate Internal VREF for Tight Output Regulation
· Two UVLO Options
· Overvoltage Protection (OVP), Open-Feedback Protection and Enable Circuits
· ± 750-mA Peak Gate Drive Current
· Low Start-Up and Operating Currents
· Lead (Pb)-Free Packages


Application

·Switch-Mode Power Supplies for Desktops, Monitors, TVs and Set Top Boxes (STBs)
·AC Adapter Front-End Power Supplies
·Electronic Ballasts


Pinout

Connection Diagram


Specifications

  UCCx805x UNIT
Supply voltage, VC (Internally clamped) 20 V
Input current into VCC clamp IDD 30 mA
Input current ZCD ±10
Gate drive current (peak), IDRV DRV ±750
Input voltage range, VCC VO_SNS, MULTIN, CS 5 V
Maximum negative voltage VO_SNS, MULTIN, DRV, CS −0.5
Power dissipation at TA= 25°C D package 650 mW
P package 1 W
Operating junction temperature range, TJ −55 to 150 °C
Storage temperature, Tstg −65 to 150
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 30

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to GND. Currents are positive into, negative out of the specified terminal.




Description

The UCC38050 and UCC38051 are PFC controllers for low-to-medium power applications requiring compliance with IEC 1000-3-2 harmonic reduction standard. UCC38050 and UCC38051 is designed for controlling a boost preregulator operating in transition mode (also referred to as boundary conduction mode or critical conduction mode operation). It features a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional to the input voltage, a current-sense (PWM) comparator, PWM logic and a totem-pole driver for driving an external FET.




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