• 简体中文
• English

LTC3901 - Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters

The LTC3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and full-bridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformer generated bipolar input to maintain synchronization with the primary side controller.

The LTC3901 provides a full range of protection features for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drain-source resistance of the two MOSFETs, turning off the MOSFETs if the inductor current reverses. The LTC3901 also shuts off the drivers if the supply is low or if the synchronization sequence is incorrect.

Features N-Channel Synchronous MOSFET Driver Programmable Timeout Reverse Inductor Current Sense Gate Drive Transformer Synchronization Sequence Monitor Wide VCC Supply Range: 4.5V to 11V 15ns Rise/Fall Times at VCC = 5V, CL = 4700pF Undervoltage Lockout Small 16-Lead SSOP Package Typical Application

Applications 48V Input Isolated DC/DC Converters Isolated Telecom Power Supplies Distributed Power Step-Down Converters Industrial Control System Power Supplies Automotive and Heavy Equipment Packaging

Order Information