Details, datasheet, quote on part number: UCC38050DR
CategorySemiconductors => Power Management => Offline and Isolated DC/DC Controllers and Converters => Power Factor Correction
Part familyUCC38050 Transition Mode PFC Controller
TitlePower Factor Correction IC's
DescriptionTransition Mode PFC Controller 8-SOIC 0 to 70
CompanyTexas Instruments, Inc.
DatasheetDownload UCC38050DR datasheet
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Operating Temperature Range(C)0 to 70
Practical Operating Frequency(Max)(MHz)0.2
Control MethodTM
Peak Output Sink Current Gate Drive(A)0.75
Device TypeSingle-phase PFC
Startup Current(mA)0.075
UVLO Thresholds On/Off(V)15.8/9.7
Operating Supply Current(mA)4
Package GroupPDIP,SOIC
Approx. Price (US$)0.23 | 1ku
FeaturesOVP,Transition Mode Control
Operating Supply(Max)(V)18
Peak Output Source Current Gate Drive(A)-0.75
  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
8DSOICR-PDSO-G2500LARGE T&R38050 3.914.91.581.27
Application notes
• UCC38050 100W Critical Conduction (PFC) Reference Design (Rev. A) | Doc
Evaluation Kits
UCC38050EVM: UCC38050 Evalution Module: 100-W Universal Line Input PFC Boost Converter
UCC28051EVM: UCC28051 Evaluation Module


Features, Applications

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

Monitors, TVs and Set Top Boxes (STBs) AC Adapter Front-End Power Supplies Electronic Ballasts

DESCRIPTION The UCC38050 and UCC38051 are PFC controllers for low-to-medium power applications requiring compliance with IEC 1000-3-2 harmonic reduction standard. It 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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

In the transition mode oepration, the PWM circuit is self-oscillating with the turn-on being governed by an inductor zero-current detector (ZCD pin) and the turn-off being governed by the current-sense comparator. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection (OVP) and enable. The UCC38050 and UCC38051, while being pin compatible with other industry controllers providing similar functionality, offer many feature enhancements and tighter specifications, leading to an overall reduction in system implementation cost. The system performance is enhanced by incorporation of zero power detect function which allows the controller output to shut down at light load conditions without running into overvoltage. The device also features innovative slew rate enhancement circuits which improve the large signal transient performance of the voltage error amplifier. The low start-up and operating currents of the device results in low power consumption and ease of start-up. Highly accurate internal bandgap reference leads to tight regulation of output voltage in normal and OVP conditions, resulting in higher system reliability. The enable comparator ensures that the controller is off if the feedback sense path is broken or if the input voltage is very low. There are two key parameteric differences between UCC38050 and UCC38051. The UVLO turn-on threshold 15.8 V while for 12.5 V. Secondly, the gM amplifier 's source current for UCC38050 is typically 1.3 mA while for is 180 A. The higher UVLO turn-on threshold of the UCC38050 allows quicker and easier start-up with a smaller VCC capacitance while the lower UVLO turn-on threshold of UCC38051 allows the operation of the PFC chip to be easily controlled by the downsteam PWM controller in two-stage power converters. The UCC38050 gM amplifier also provides a full 1.3-mA typical source current for faster start-up and improved transient response when output is low either at start-up or during transient conditions. The UCC38051 scales this source current back down 180- A typical source current to gradually increase the error voltage preventing a step increase in line currents at start-up but still provides good transient response. The UCC38051 is suitable for multiple applications including AC adapters where a two-stage power conversion is needed. The UCC38050 is suitable for applications such as electronic ballasts where there is no down-stream PWM conversion and the advantages of smaller VCC capacitor and improved transient response can be realized. Devices are available in either the industrial temperature range (UCC2805x) or commercial temperature range 70C (UCC3805x). Package offerings are 8-pin SOIC (D) or 8-pin PDIP (P) packages.

to 70C UVLO Threshold Voltage ON/OFF (V) gM Amplifier Source So rce Current C rrent (A) Packaged Devices(1) SOIC-8 (D) UCC38051D PDIP-8 (P) UCC28051P UCC38050P

D (SOIC-8) package is available taped and reeled. Add R suffix to device type (e.g. UCC28050DR) to order quantities of 2,500 devices per reel.

over operating free-air temperature range unless otherwise noted(1) UCCx805x Supply voltage, VCC Input current into VCC clamp Input current Gate drive current (peak), IDRV Input voltage range, VCC Maximum negative voltage Power dissipation at TA= 25C Operating junction temperature range, TJ Storage temperature, Tstg (Internally clamped) IDD ZCD DRV VO_SNS, MULTIN, CS VO_SNS, MULTIN, DRV, CS D package P package W mA UNIT V

Lead temperature mm (1/16 inch) from case for 10 seconds 300 (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.


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