Design
Power supply reference design for ultrasound CW pulser
This reference design from Texas Instruments allows a digitally programmable power supply to power an ultrasound transmit circuit for continuous wave (CW) mode from a 24-V bus. There are two outputs adjustable from ±2.5 to ±12 V under user software control. These outputs can provide up to two amps with very low ripple and noise on both positive and negative regulator outputs.
The power supply is scalable for higher output currents up to three amps by adding more regulators in parallel. The power supplies can also be synchronised to an external clock.
Features
- Separate and independent positive and negative voltage power supplies for CW mode in ultrasonic.
- To reduce ripple at output's high performance, low noise LDOs are operated as power filters to obtain lowest ripple with minimum heat dissipation in LDO (<100µV at 1.6A load).
- Comprises two high-performance buck regulators for creating adjustable outputs.
- Adaptive drop on LDO, special circuit keeps LDO output always 1V below LDO input.
- Capable of switching frequency synchronisation with ultrasound master or system clock frequency.
To view the reference design, click here.
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