This reference design is a 28-V output, 5-A synchronous buck converter for space applications operating from a 50-V to 150-V input range. The TPS7H5001-SP PWM controller controls the power stage. The INA901-SP senses the inductor current and provides current feedback to the controller enabling both average current mode control and output short-circuit protection. If these features are not needed, the INA901-SP can be removed and the TPS7H5001-SP can be operated with voltage mode control. The adjustable deadtime of the TPS7H5001-SP allows the timing of the switching MOSFETs to be optimized and results in over 94% efficiency with 100-V input and over 96% efficiency with 50-V input. A self-biasing circuit is included to power the control circuits directly from the output. If an external 12-V bias is provided, the self-biasing circuit can be removed and result in higher efficiency.
| Output voltage options | PMP23193.1 |
|---|---|
| Vin (Min) (V) | 50 |
| Vin (Max) (V) | 150 |
| Vout (Nom) (V) | 28 |
| Iout (Max) (A) | 5 |
| Output Power (W) | 140 |
| 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 | 50- to 150-VIN, 28-V 5-A Sync. Buck Converter RefDes for 100-kRad Space Apps | PDF | HTML | May 02, 2023 |
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