This reference design delivers a 48-V output, low-noise power supply for the phantom power application using the TPS61391 and TPS7A4101 devices. The TPS61391 is a 700-kHz PWM step-up converter that converts
3.3 V or 5 V to 48.5 V. The 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 only around 8.4 mV, which is pretty low for phantom power applications.
Parameter | Specifications |
---|---|
Input Voltage | 3.3-5 VDC |
Output Voltage | 48 VDC |
Output Current |
10-mA at 3.3-VDC input 20-mA at 5-VDC input |
Multimeter (voltage): Fluke 287C
DC Source: Chroma MODEL 62012P-100-50
The board dimensions are 58.4 mm (length) × 30.5 mm (width) × 8.4 mm (height).