DC2014A

Demonstration circuit 2014A is a micropower no-opto isolated flyback converter featuring th eLT®8302. This demo circuit outputs 5V, and maintains tight regulation with a load current from 10mA to 2.2A over an input voltage from 10V 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 DC2014A, 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.

• Output voltage ripple (peak to peak) of 100mV (VIN = 10V to 30V, IOUT = 2.2A)
• Typical switching frequency of 345KHz (VIN = 24V, IOUT = 2.2A)
• Minimum switching frequency of 12KHz at IOUT = 0mA
• Efficiency of 84% at VIN = 30V, IOUT = 2.2A

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