Programmable ±100-V: High-Current: Floating Linear Regulator Reference Design for Ultrasound Systems
Description
Ultrasound transmitters require a stable programmable DC power source to drive high current into piezo transducers during the transmission. The TIDA-01371 reference design demonstrates a positive and negative linear regulator that can provide output voltages varying from ±2.5 to ±100V. The programmability (meant to come from a DAC) is implemented using external control voltages. The low-noise performance helps in replacing passive and active noise filters with off-the-shelf low-noise positive and negative LDO regulators and a circuit to float the ground of the regulators. In addition: it uses external power MOSFETs to scale the current capability of regulators to support special imaging modes such as shear wave: or elastography: mode. In order to provide extremely high currents to the transducers: large input capacitors can provide high energy for 1ms of duration keeping the average current drawn from this power supply very low.
Features
- Floating and tracking regulator: replaces passive and active noise filters with off-the-shelf LDO regulators with better than ±1.5% load regulationInnovative current sharing scheme uses TI's best-in-class low RDS(ON) CSD series power MOSFETs and low impedance driver circuits to improve the transient responseProgrammable output voltage from ±2.5V to ±100V using control signals coming from DACScalable in terms of output current for 1ms pulses (tested up to ±20A) to support special imaging modesSeparate and independent positive and negative voltage power supplies enables flexibility in powering the ultrasound transmit circuit
Applications
- Mother & neonatal care monitor
- MRI
- Ultrasound scanner
Product Categories
- Power management