DC2014A

LINEAR TECHNOLOGY  DC2014A  演示板, LT8302, 反激式转换器

The is a Demonstration Board for LT8302ES8E a micropower no-opto isolated flyback converter. This demo circuit outputs 5V and maintains tight regulation with a load current from 10mA to 2.2A over an input voltage from 10 to 30V. The output current capability increases with the input voltage. The LT8302 typically needs less than 0.5% of its full output power as a minimum load to maintain good output voltage regulation. On the board in order to avoid pre-loading, a 5.6V Zener diode is placed between its VOUT+ and VOUT- to serve as a minimum load. Transformer leakage inductance causes a voltage spike on the primary side after the power switch turns off. To limit this leakage inductance spike within 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 with some pre-designed transformers.