Dc-Dc Converter Circuit With 3.3V And 5V Outputs Circuit


Posted on Sep 18, 2012

Input, voltages can range from 8 V to 30 V. The load range on the 5 V is 0,05 A to 5 A while the 3.3-V load range is 0.1 A to 1 A. The circuit is self-protected under no-load conditions. Over all load and line conditions, .including cross regulation, the 3.3-V output varies from 3.25 V to 3.27 V. The 5-V output varies from 4.81 V to 5.19 V under the same conditions. In a typical application to 0.5 A on the 3.3 V and 0.25 A on the 5 V, efficiency is typically 76%, With an input voltage of 30 V and a full-load condition, the efficiency drops to 66%. In normal operating regions, efficiency is always better than 70%.


Dc-Dc Converter Circuit With 3.3V And 5V Outputs Circuit
Click here to download the full size of the above Circuit.

The 5-V ripple is less than 75 mV and the 3.3-V ripple less than 50 mV over all line and load conditions.




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