LT3748EMS#TRPBF

LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform. This utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of this combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V. Typical applications are isolated telecom converters, high power automotive supplies, isolated industrial power supplies, military and high temperature applications.

• 5V to 100V input voltage range
• 1.9A average gate drive source and sink current
• Boundary mode operation
• No transformer third winding or opto-isolator required for regulation
• Primary-side winding feedback load regulation
• VOUT set with two external resistors, INTVCC pin for control of gate driver voltage
• Programmable soft start, programmable undervoltage lockout
• 16-lead plastic MSOP package
• Temperature range from –40°C to 125°C

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