Demonstration circuit 2821A is a compact no-opto isolated flyback converter featuring the LT8302. The DC2821A outputs 12V, and maintains ±1% (typ) regulation with a load current from 5mA up to 1.4A and over an input voltage from 4V to 28V. The output current capability increases with the input voltage.
Transformer leakage inductance causes a voltage spike on the primary side after the power switch turns off. To limit this leakage inductance spike within the MOSFET voltage rating of 65V, an RC snubber and a TVS clamp are installed to damp the ringing and clamp the MOSFET drain voltage to a safe level.
The demo circuit can be easily modified for different applications using predesigned transformers.
The LT8302 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the quick start guide for DC2821A.
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Documentation & Resources
DC2821A Schematic9/11/201824 K
DC2821A Demo Manual (Rev. A)9/11/2018578 K
DC2821A Design Files9/11/2018ZIP908 K
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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.