LT1952IGN-1#PBF

LT1952-1 is a current mode PWM controller optimized to control the forward converter topology, using one primary MOSFET. It provide 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 devices include soft-start for controlled exit from shutdown and undervoltage lockout. A precision 107mV current limit threshold, independent of duty cycle, combines with soft start to provide hiccup short-circuit protection. Programmable slope compensation and leading edge blanking allow optimization of loop bandwidth with a wide range of inductors and MOSFETs. It is used in application such as telecommunications power supplies, industrial and distributed power, isolated and non isolated DC/DC converters etc.

• Synchronous rectifier control for high efficiency
• Programmable volt-second clamp, current mode control
• Output power levels from 25W to 500W, low current start-up
• True PWM soft-start, low stress short-circuit protection
• Adjustable delay for synchronous timing, accurate shutdown threshold with programmable hysteresis
• Programmable slope compensation, programmable leading edge blanking
• Synchronizable to an external clock upto 1.5fOSC
• Internal 1.23V reference, 2.5V external reference
• Frequency (oscillator) is 200KHz typical at (ROSC = 178k, FB = 1V, SS-MAXDC = 1.84V)
• Operating temperature is -40°C to +125°C, package style is 16-lead plastic SSOP

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