This reference design is a 28V output, 12A synchronous buck converter for space missions operating from a 50V to 150V input range. Primary applications include stepping down voltages from solar panels and 120VDC power distribution buses. The TPS7H5006-SEP pulse width modulation (PWM) controller controls the power stage using voltage mode control. The OPA4H199-SEP senses the sense resistor voltage which enables the output short-circuit protection. The adjustable dead time of the TPS7H6005-SEP allows the timing of the switching MOSFETs to be optimized and results in over 95% efficiency with 100V input and over 96% efficiency with 50V input. A 12V self-biasing circuit is included to power the control circuits directly from the output. If an external 12V bias is provided, the self-biasing circuit can be removed, and results in higher efficiency.
| Output voltage options | PMP23552.1 |
|---|---|
| Vin (Min) (V) | 50 |
| Vin (Max) (V) | 150 |
| Vout (Nom) (V) | 28 |
| Iout (Max) (A) | 12 |
| Output Power (W) | 336 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | Buck- Synchronous |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Test results for the reference design, including efficiency graphs, test prerequisites and more
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| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | 50VIN to 150VIN, 28V 12A Synchronous Buck Converter Reference Design for Range of Space Missions | PDF | HTML | Feb. 07, 2025 |
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