Texas Instruments UCC38500EVM User Manual
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Texas Instruments UCC38500EVM User Manual

Pfc/pwm combination controller
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Using the UCC38500EVM
User's Guide
SLUU068C

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Summary of Contents for Texas Instruments UCC38500EVM

  • Page 1 Using the UCC38500EVM User’s Guide SLUU068C...
  • Page 2 Using the UCC38500 User’s Guide February 2005 Power Management Products SLUU068C...

  • Page 3: Important Notice

    Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

  • Page 4: Evm Important Notice

    EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
  • Page 5 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Copyright  2001, Texas Instruments Incorporated Mailing Address: Texas Instruments...

  • Page 6: Table Of Contents

    General Information ............. Features .

  • Page 7: General Information

    This chapter details the Texas Instruments (TI) DM38500 PFC/PWM Combination Controller 100W Power Factor Correction Preregulator Evaluation Module (EVM) SLUU068. It includes a list of EVM features, a brief description of the module illustrated with a pictorial, schematic diagrams, and EVM specifications.

  • Page 8: Features

    Features 1.1 Features UCC38500 PFC/PWM Combination Controller 100W Power Factor Correc- tion Preregulator include: Combines PFC and 2nd Stage Down Converter Controls Controls Boost Preregulator to Near-unity Power Factor Accurate Power Limiting Improved Feedforward Line Regulation Peak Current Mode Control in Second Stage Programmable Oscillator Leading Edge/Trailing Edge Modulation for Reduced Output Ripple Low Startup Supply Current...

  • Page 9: Operating Guidelines

    For more information, pin description and specifications for the UCC38500 PFC/PWM Combination Controller, please refer to the datasheet or contact the Texas Instruments Semiconductor Product Information Center at 1-800-336-5236 or 1-972-644-5580. Product Information can also be found on the World Wide Web at www.ti.com.
  • Page 10 Description Figure 1−1. DM38500 Evaluation Module Application Schematic UDG−00094 Note: High-Voltage component. See EVM Warnings and Restrictions at the back of this document. Note: High-Temperature component. See EVM Warnings and Restrictions at the back of this document.

  • Page 11: Dm38500 Evm Performance

    1.4 DM38500 EVM Performance Figure 1−2 through 1−4 shows the typical evaluation module performance. Figure 1−2. DM38500 EVM Efficiency Figure 1−3. DM38500 Power Factor 1.00 0.95 0.90 0.85 DM38500 EVM Performance UCC38500 EFFICIENCY OUTPUT POWER = 265 V = 175 V = 85 V P OUT −...
  • Page 12 DM38500 EVM Performance Figure 1−4. DM38500 Total Harmonic Distortion UCC38500 TOTAL HARMONIC DISTORTION V IN = 265 V V IN = 175 V V IN = 85 V OUTPUT POWER P OUT − W...

  • Page 13: Reference

    This chapter includes a parts list and PCB layout illustrations for the DM38500 EVM. Topic DM38500 EVM Part Descriptions ........DM38500 Board Layouts Chapter 2 Reference...

  • Page 14: Dm38500 Evm Part Descriptions

    DM38500 EVM Part Descriptions 2.1 DM38500 EVM Part Descriptions Table 2−1. DM38500 Part Descriptions Description Reference C12, C20, 1 µF, 50 V, polypropylene 47 pF, 50 V, ceramic C7, C16, 10 nF, 50 V, ceramic C17, C38 100 pF, 50 V, ceramic 2.2 nF, 50 V, ceramic 470 nF, 400 V, polypropylene...
  • Page 15 Description Reference R1, R12 Short 200 Ω, ¼ W R10, R36 R25, R29, 10 kΩ, ¼ W 2 kΩ, ¼ W 1.5 kΩ, ¼ W 3.92 kΩ, ¼ W R15, R19 750 Ω, ¼ W 7.5 kΩ, ¼ W 392 kΩ, ¼ W R18, R24 1 kΩ, ¼...

  • Page 16: Dm38500 Board Layouts

    DM38500 Board Layouts 2.2 DM38500 Board Layouts Board layout examples of the DM38500 EVM PCB are shown in the following illustrations. They are not to scale and appear here only as a reference. Figure 2−1. DM38500 EVM PC Board: Top Assembly...

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