LT1952 Datasheet | Linear Technology

LT1952 Single Switch Synchronous Forward Controller .. Features - - - - - - - - - - - - - - - - - DESCRIPTIO Synchronous Rectifier Control for High Efficiency Programmable Volt-Second Clamp Output Power Levels from 25W to 500W Low Current Start-Up True PWM Soft-Start Low Stress Short Circuit Protection Precision 100m V Current Limit Threshold Adjustable Delay for Synchronous Timing Accurate Shutdown Threshold with Programmable Hysteresis Programmable Slope pensation Programmable Leading Edge Blanking Programmable Frequency (100k Hz to 500k Hz) Synchronizable to an External Clock up to 1.5 - f OSC Internal 1.23V Reference 2.5V External Reference Current Mode Control Small 16-Pin SSOP Package U APPLICATIO S - - - Telemunications Power Supplies Industrial and Distributed Power Isolated and Non-Isolated DC/DC Converters The LT®1952 is a current mode PWM controller optimized to control the forward converter topology, using one primary MOSFET. The LT1952 provides synchronous rectifier control, resulting in extremely high efficiency. A programmable Volt-Second clamp provides a safeguard for transformer reset that prevents saturation. This allows a single MOSFET on the primary side to reliably run at greater than 50% duty cycle for high MOSFET, transformer and rectifier utilization. The LT1952 includes soft-start for controlled exit from shutdown, overcurrent conditions and undervoltage lockout. A precision 100m V current limit threshold, independent of duty cycle, bines with soft-start to provide hiccup short circuit protection. Micropower start-up allows the LT1952 to be efficiently started from high input voltages. Programmable slope pensation and leading edge blanking allow optimization of loop bandwidth with a wide range of inductors and MOSFETs. The LT1952 can be programmed over a 100k Hz to 500k Hz frequency range and the part can be synchronized to an external clock. The error amplifier is a true op amp, allowing a wide range of...