LT3748EMS#TRPBF

The LT3748EMS#TRPBF from Analog Devices is a versatile 100V isolated flyback controller. It is specifically engineered for isolated flyback topologies, enabling high power output. This controller drives an external N-channel MOSFET from an internally regulated 7V supply. A key feature is its ability to sense the isolated output voltage directly from the primary-side flyback waveform, eliminating the need for a third winding or opto-isolator for regulation.

The LT3748 utilizes boundary mode operation, which contributes to a smaller magnetic component solution without compromising load regulation. The operating frequency is dynamically set by the load current and the transformer's magnetizing inductance. Combined with a suitable external MOSFET, the LT3748 can deliver load power up to several tens of watts from input voltages as high as 100V.

This controller supports a wide input voltage range from 5V to 100V and provides an average gate drive source and sink current of 1.9A. The output voltage can be set using two external resistors. It also includes programmable soft-start and undervoltage lockout features. The LT3748 is available in a high-voltage 16-lead MSOP package, with four leads removed for enhanced high-voltage creepage. It is AEC-Q100 qualified for automotive applications, making it suitable for isolated telecom converters, high-power automotive supplies, isolated industrial power supplies, and military or high-temperature applications.