Programmable ±100-V, High-Current, Floating Linear Regulator Reference Design for Ultrasound Systems

(ACTIVE) TIDA-01371

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Key Document

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 regulation
  • Innovative 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 response
  • Programmable output voltage from ±2.5V to ±100V using control signals coming from DAC
  • Scalable in terms of output current for 1ms pulses (tested up to ±20A) to support special imaging modes
  • Separate and independent positive and negative voltage power supplies enables flexibility in powering the ultrasound transmit circuit

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  




TI Devices (5)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19533KCS  100V, 8.7mOhm, TO-220 N-Channel NexFET™ Power MOSFET  Power MOSFET  Sample & Buy Not Available
TLV171  36V Low-Power RRO General-Purpose Operational Amplifier  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
TLV2171  36V, Low Power, RRO, General Purpose Operational Amplifier  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A33  Vin -3V to -36V, -1A, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36V, 1A, 4.17μVRMS, RF Low-Dropout (LDO) Voltage Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 4109 30 Jul 2017 870
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 357 13 Feb 2017 27
ZIP 1225 13 Feb 2017 118
PDF 2006 13 Feb 2017 87
PDF 351 13 Feb 2017 81
PDF 136 13 Feb 2017 99
PDF 698 13 Feb 2017 484


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