LM5035CEVAL/NOPB

User's Guide SNVA433A – March 2010 – Revised May 2013 AN-2043 LM5035C Evaluation Board 1 Introduction The LM5035C evaluation board is designed to provide the design engineer with a fully functional power converter based on the half bridge topology to evaluate the LM5035C controller. The LM5035C is a functional variant of the LM5035B half-bridge PWM controller. The amplitude of the SR control signals are 5V instead of the VCC level. 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 • Output current: 0 to 30A • Measured efficiency: 89% at 30A, 92% at 15A • Frequency of operation: 400kHz • Board size: 2.28 x 1.45 x 0.5 inches • Load Regulation: 0.2% • Line Regulation: 0.1% • Line under-voltage lock-out (UVLO) (33.9V/31.9V on/off) • Line over-voltage protection (OVP) (79.4V/78.3V off/on) • Hiccup 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