Spacecraft bus voltages vary from the well-established 28-V to more than the 100-V typically used in highpower commercial communications satellites, this reference design shows an example for a space-grade 50-W isolated intermediary bus converter, while implementing over-current protection (OCP) limit function. This design features INA901-SP radiation hardened current monitor, LM139AQML-SP quadcomparator, and UC1901-SP to create an isolated feedback flyback with current sensing and overcurrent flags – the UC1843A-SP current mode PWM controller is used to switch the low side MOSFET of the flyback converter and provide voltage and current to the output, the UC1901-SP senses the output voltage and completes the loop for the isolated feedback. The INA901-SP senses the input current which is provided to the LM139AQML-SP to create an overcurrent flag.
| Output voltage options | TIDA-070002.1 |
|---|---|
| Vin (Min) (V) | 20 |
| Vin (Max) (V) | 40 |
| Vout (Nom) (V) | 5 |
| Iout (Max) (A) | 10 |
| Output Power (W) | 50 |
| Isolated/Non-Isolated | Isolated |
| Input Type | DC |
| Topology | Flyback- CCM |
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Reference design overview and verified performance test data
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | 20- to 40-VIN, 50-W Space-Grade Isolated-Flyback DC-DC Over Current Protection (Rev. B) | Jul. 30, 2019 |
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