Circuit Design of High Efficiency Dual Output Buck Converter
Summary:
working principle
The power supply shown in the figure uses a simple buck topology technique that implements two output voltages without a transformer. Typical applications include meter power supplies that require a 3.3 V supply for metering, and a 12 V supply for switching relays or powering wireless modules for remote meter reading.
design feature
- Low cost dual output design
- Works within the universal input voltage range, so a single design can be marketed worldwide
- Feedback is obtained by a low cost simple voltage divider
- 3.3 V output with excellent regulation (±5%)
- Excellent energy efficiency
- Standby input power consumption is low: less than 300 mW at 230 VAC AC input, 50 mW output load
- More efficient than a typical Zener regulator/linear regulator solution
- Conforms to CISPR-22/EN55022B for conductive EMI restrictions
See the PDF document for details (click on the PDF file to download)
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