This reference design delivers a 48-V output, low-noise power supply for the phantom power application using the TPS61391 and TPS7A4101. TPS61391 is a 700-kHz PWM step-up converter that converts 3.3 V or 5 V to 48.5 V. TPS7A4101 is a 50-V tolerant input and 0.29-V drop LDO that steps 48.5 V down to 48 V and minimizes the output ripple. The design supports 48-V, 20-mA output power at 5-V input. The output ripple is approximately 8.4-mV, which is low for phantom power application.
| Output voltage options | PMP40871.1 | PMP40871.2 |
|---|---|---|
| Vin (Min) (V) | 3.3 | 48.3 |
| Vin (Max) (V) | 5 | 48.5 |
| Vout (Nom) (V) | 48.5 | 48 |
| Iout (Max) (A) | .02 | .02 |
| Output Power (W) | .97 | .96 |
| Isolated/Non-Isolated | Non-Isolated | Non-Isolated |
| Input Type | DC | DC |
| Topology | Boost- Non Sync | Linear Regulator |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | 48-V Output Low-Noise Phantom Power Reference Design | PDF | HTML | Apr. 22, 2021 |
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