Texas Instruments UCC38500EVM manual Operating Guidelines, Load Connections, Applying Input Power

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1.3 Operating Guidelines

Description

1.3 Operating Guidelines

The operating guidelines for the evaluation board are provided with reference to the schematic in Figure 1−1 and the component layout in Figure 2−1.

1.3.1Step 1. Load Connections

A resistive or electronic load can be applied to the output terminals labeled OUT− and OUT+.

Note: For safety reasons the load should be connected before power is sup- plied to the demonstration board.

1.3.2Step 2. Applying Input Power

A 60 Hz AC power source not exceeding 265 VRMS needs be applied across terminals AC−N and AC−L for proper operation.

1.3.3Step 3. Evaluating the Demonstration’s Boards Performance.

With the AC source set between 85−265 V RMS the output voltage should be regulated and the input current should track the input voltage shape with near unity power factor. The operation of the circuit is verified over the line and load range and shows efficiency as high as 85%. At lighter loads, there may be some distortion in the line current due to Discontinuous Conduction Mode (DCM) operation. Please refer to Figures 1−2, 1−3 and 1−4 for typical EVM performance.

1.3.4Additional Information

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.

General Information

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Contents Using the UCC38500EVM User’s GuideSLUU068C Power Management Products Using the UCC38500User’s Guide FebruaryIMPORTANT NOTICE EVM IMPORTANT NOTICE EVM WARNINGS AND RESTRICTIONS 1−1. DM38500 Evaluation Module Application Schematic Contents1.3.3 Step 3. Evaluating the Demonstration’s Boards Performance 1.3.4 Additional Information 1.4 DM38500 EVM PerformanceChapter General InformationPage TopicJ Controls Boost Preregulator to Near-unity Power Factor 1.1 FeaturesJ Accurate Power Limiting J Improved Feedforward Line Regulation 1.2 Description1.3 Operating Guidelines 1.3.2 Step 2. Applying Input Power1.3.1 Step 1. Load Connections 1.3.3 Step 3. Evaluating the Demonstration’s Boards PerformanceHigh-Voltage component. See High-Temperature componentSee EVM Warnings EVM Warnings andFigure 1−3. DM38500 Power Factor 1.4 DM38500 EVM PerformanceFigure 1−2. DM38500 EVM Efficiency Distortion Figure 1−4. DM38500 Total Harmonic DistortionTotal V IN = 265Reference DM38500 EVM Part DescriptionsDM38500 Board Layouts Table 2−1. DM38500 Part Descriptions 2.1 DM38500 EVM Part Descriptions3 Capacitor C38 is located at reference designator R38 on the PCB 2 Unless otherwise specified, all resistors have a tolerance of ±1%Description Value/Type Number2.2 DM38500 Board Layouts Figure 2−1. DM38500 EVM PC Board Top Assembly
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