SLVAFE7 September 2022 LM51551
Table 1-1 summarizes the design specifications of a high-voltage power supply for an ultrasound smart probe.
| Characteristic | Specification |
|---|---|
| Input voltage | 12 V |
| Output voltage | Bipolar (from 15 V to 75 V at 10 mA and –15 V to –75 V at –10 mA), total maximum output power 1.5 W |
| Peak efficiency | 88% |
| Switching frequency | 250 kHz |
| Size (length × width) | 15 mm × 45 mm (single layer) |
| Height | < 5 mm |
| Output voltage regulation | 2% |
| Voltage symmetry with equal load on both rails | 1% |
| Output ripple | 0.1% of the output voltage |
| Synchronization to external clock frequency | No |
| Adjustable output voltage | Yes |
An ultrasound smart probe has strict requirements on the size, power consumption, and thermal performance to make the device convenient to use. The key design challenges are as follows: