LT3574EMS#PBF

LT3574 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from the primary side flyback waveform. It utilizes boundary mode operation to provide a small magnetic solution with improved load regulation. The output voltage is easily set with two external resistors and the transformer turns ratio. Off-the-shelf transformers are available for many applications. It is widely used in application such as industrial, automotive and medical isolated power supplies etc.

• Input voltage range is 3V to 40V
• Switch current limit is 0.9A typical
• Boundary mode operation, no transformer third winding or opto-isolator required for regulation
• Improved primary-side winding feedback load regulation
• VOUT set with two external resistors
• BIAS pin for internal bias supply and power NPN driver
• Programmable soft-start, programmable power switch current limit
• Minimum switching frequency is 40KHz typical at (VC = 0.35V)
• Operating junction temperature is -40°C to 125°C
• Package style is 16-lead plastic MSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party