Full-Bridge Controller For Piezoelectric Transformers

Liquid-crystal Display (LCD) enclosures and cold-cathode fluorescent lamps (CCFL) used in notebook computer and portable electronic Displays are becoming increa- singly narrow, generating the need for a low-profile CCFL power supply. Recent advances in piezoelectric transformers (PZTs) have made it possible to develop smaller, more efficient, and safer backlight inverters for portable Displays Piezoelectric transformers have shown better performance than magnetic transformers with respect to efficiency, EMI requirements, human safety, and form factor. The MAX8785A is a full-bridge CCFL Controller for piezoelectric transformer-based backlight power supplies. The full-bridge topology pro- vides a high-spectral purity sinusoidal drive that helps the PZT convert electrical energy to mechanical and back to electrical energy efficiently. By Maxim Integrated Products