LM5039_1

LM5039 Evaluation Board LM5039 Evaluation Board National Semiconductor Application Note 2025 Ajay Hari February 17, 2010 Introduction The LM5039 evaluation board is designed to provide the design engineer with a fully functional power converter based on the half-bridge topology to evaluate the LM5039 controller. The evaluation board is provided in an industry standard quarter brick footprint. The performance of the evaluation board is as follows: • Input Operating Range: 36V to 75V • Output Voltage: 3.3V • Measured Efficiency: 89% @ 30A, 92% @ 15A • Frequency of Operation: 400 kHz • Board Size: 2.28 x 1.45x 0.5 inches • Load Regulation: 0.2% • Line Regulation 0.1% • Line UVLO (31V/30V on/off) • Constant Current Limit The printed circuit board consists of 6 layers, 2 ounce copper outer layers, and 3 ounce copper inner layers on FR4 material, with a total thickness of 0.062 inches. The unit is designed for continuous operation at rated load at