LT1950 Datasheet | Linear Technology

.Data Sheet.in LT1950 Single Switch PWM Controller with Auxiliary Boost Converter DESCRIPTIO The LT®1950 is a wide input range, forward, boost, flyback and SEPIC controller that drives an N-channel power MOSFET with few external ponents required. A resistor programmable duty cycle clamp can be used to generate a volt-second clamp for forward converter applications. An internal boost switcher is available for creating a separate supply for the output gate driver, allowing 10V gate drive from input voltages as low as 3V. The LT1950’s operating frequency can be set with an external resistor over a 100k Hz to 500k Hz range and a SYNC pin allows the part to be synchronized to an external clock. Additional programmability exists for leading edge blanking and slope pensation. A fast current sense parator achieves 60ns current sense delay and the error amplifier is a true voltage mode error amplifier, allowing a wide range of pensation networks. An accurate shutdown pin with programmable hysteresis is available for undervoltage lockout and shutdown. The LT1950 is available in a small 16-Pin SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. Features s s s s s s s s s s s s s s U APPLICATIO S s s s s Wide Input Range: 3V to 25V Programmable Volt-Second Clamp Output Power Levels from 25W to 500W Auxiliary Boost Converter Provides 10V Gate Drive from VIN as Low as 3V Programmable Operating Frequency (100k Hz to 500k Hz) with One External Resistor Programmable Slope pensation Programmable Leading Edge Blanking ±2% Internal 1.23V Reference Accurate Shutdown Pin Threshold with Programmable Hysteresis 60ns Current Sense Delay 2.5V Auxiliary Reference Output Synchronizable to an External Clock up to 1.5 - f OSC Current Mode Control Small 16-Pin SSOP Package Tele Power Supplies Automotive Power Supplies Portable Electronic Equipment Isolated and Nonisolated DC/DC Converters TYPICAL APPLICATIO 36V to 72V DC to 26V/5A...