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
General Information |
