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DataSheet.
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 components 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 100kHz to 500kHz range and a SYNC pin allows the part to be synchronized to an external cloc...

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