Product Details

Demonstration circuit 2793A is a high VIN no-opto synchronous flyback converter featuring the LT8316. The demo board outputs 5V and maintains tight regulation with a load current from 70mA to 7A. It is optimized to operate over a wide 140V to 450V DC input voltage range. Output voltage accuracy stays within ±5% over the entire input voltage and load range. 

On the secondary side, the LT8309 synchronous rectifier driver senses the synchronous MOSFET drain-to-source voltage to determine its turn-on period. By replacing the diode rectifier with an N-Channel MOSFET, the efficiency and thermal performance is greatly improved. 

The LT8316 is a 600V flyback controller. No opto-isolator is needed for regulation. The part samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation. At start-up, the INTVCC capacitor is charged via a high voltage current source; during normal operation, the current source turns off to save power consumption.

DC2793A features an option to turn on standby mode by simply changing the position of a jumper from “DIS” to “EN”. Standby mode reduces the minimum switching frequency to 220Hz for ultralow quiescent power consumption.

The LT8316 and LT8309 data sheets give a complete description of the parts, and operation and application information. The data sheets must be read in conjunction with this quick start guide for demo circuit 2793A.

Documentation & Resources


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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.