DC2138B

DC2138B demonstration circuit is an isolated flyback converter featuring the LT®8301. This demo circuit outputs 5V from a 10V to 32V input, with a nominal of 24V. The output current capability increases with the input voltage. The standby input current of the demo circuit is less than 950µA (typical) at VIN = 24V. The performance summary table summarizes the performance of the demo board at room temperature. The demo circuit can be easily modified for different applications with some pre-designed transformers. The DC2138B needs a very small minimum load (~6mA) to regulate the output voltage, thanks to the accurate current limit capability and ultralow switching frequency of LT8301 at very light load. On the board, a Zener diode is placed on the output to clamp the voltage to ~5V. This Zener is optional and can be replaced with a 0.8K resistor.