The LTC1698 is a precision secondary-side forward converter controller that synchronously drives external N-channel MOSFETs. It is designed for use with the LT3781 primary-side synchronous forward converter controller to create a completely isolated power supply. The LT3781 synchronizes the LTC1698 through a small pulse transformer and the LTC1698 drives a feedback optocoupler to close the feedback loop. Output accuracy of ±0.8% and high efficiency over a wide range of load currents are obtained. The LTC1698 provides accurate secondary-side current limit using an external current sense resistor. The input voltage at the MARGIN pin provides ±5% output voltage adjustment. A power good flag and overvoltage input are provided to ensure proper power supply conditions. An auxiliary 3.3V logic supply is included that supplies up to 10mA of output current. Applications * 48V Input Isolated DC/DC Converters * Isolated Telecommunication Power Systems * Distributed Power Step-Down Converters * Industrial Control Systems * Automotive and Heavy Equipment * High Efficiency Over Wide Load Current Range * ±0.8% Output Voltage Accuracy * Dual N-Channel MOSFET Synchronous Drivers * Pulse Transformer Synchronization * Optocoupler Feedback Driver * Programmable Current Limit Protection * ±5% Margin Output Voltage Adjustment * Adjustable Overvoltage Fault Protection * Power Good Flag * Auxiliary 3.3V Logic Supply * Available in 16-Lead SSOP and SO Packages https://elecena.pl/product/283530/isolated-secondary-synchronous-rectifier-controller 2007-03-11 https://elecena.pl/product/283530/isolated-secondary-synchronous-rectifier-controller 2014-05-14 https://elecena.pl/product/283530/isolated-secondary-synchronous-rectifier-controller 2025-01-21