SLUS794F November 2007 – April 2016 UCC28070
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
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7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Interleaving
- 7.3.2 Programming the PWM Frequency and Maximum Duty-Cycle Clamp
- 7.3.3 Frequency Dithering (Magnitude and Rate)
- 7.3.4 External Clock Synchronization
- 7.3.5 Multi-phase Operation
- 7.3.6 VSENSE and VINAC Resistor Configuration
- 7.3.7 VSENSE and VINAC Open-Circuit Protection
- 7.3.8 Current Synthesizer
- 7.3.9 Programmable Peak Current Limit
- 7.3.10 Linear Multiplier and Quantized Voltage Feed Forward
- 7.3.11 Enhanced Transient Response (VA Slew-Rate Correction)
- 7.3.12 Voltage Biasing (VCC and VVREF)
- 7.3.13 PFC Enable and Disable
- 7.3.14 Adaptive Soft Start
- 7.3.15 PFC Start-Up Hold Off
- 7.3.16 Output Overvoltage Protection (OVP)
- 7.3.17 Zero-Power Detection
- 7.3.18 Thermal Shutdown
- 7.3.19 Current Loop Compensation
- 7.3.20 Voltage Loop Compensation
- 7.4 Device Functional Modes
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8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Output Current Calculation
- 8.2.2.2 Bridge Rectifier
- 8.2.2.3 PFC Inductor (L1 and L2)
- 8.2.2.4 PFC MOSFETs (M1 and M2)
- 8.2.2.5 PFC Diode
- 8.2.2.6 PFC Output Capacitor
- 8.2.2.7 Current Loop Feedback Configuration (Sizing of the Current Transformer Turns Ratio and Sense Resistor (RS)
- 8.2.2.8 Current Sense Offset and PWM Ramp for Improved Noise Immunity
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
11 Device and Documentation Support
11.1 Documentation Support
11.1.1 Related Documentation
For related documentation see the following:
- O’Loughlin, Michael, An Interleaving PFC Pre-Regulator for High-Power Converters, Texas Instruments, Inc. 2006 Unitrode Power Supply Seminar, Topic 5
- Erickson, Robert W., Fundamentals of Power Electronics, 1st ed., pp. 604-608 Norwell, MA: Kluwer Academic Publishers, 1997
- Creel, Kirby Measuring Transformer Distributed Capacitance, White Paper, Datatronic Distribution, Inc. website: http://www.datatronics.com/pdf/distributed_capacitance_paper.pdf
- L. H. Dixon, Optimizing the Design of a High Power Factor Switching Preregulator, Unitrode Power Supply Design Seminar Manual SEM700, 1990. SLUP093
- L. H. Dixon, High Power Factor Preregulator for Off-Line Power Supplies, Unitrode Power Supply Design Seminar Manual SEM600, 1988. SLUP087
11.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.
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TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers.
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Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.
11.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.