Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser

1 января 2018

This reference design 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 2 A with very low ripple and noise on both positive and negative regulator outputs. The power supply is scalable for higher output currents up to 3 A by adding more regulators in parallel. The power supplies can also be synchronized to an external clock.

Особенности

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 synchronization with ultrasound master or system clock frequency