Programmable ±100-V, High-Current, Floating Linear Regulator Reference Design for Ultrasound Systems TIDA-01371 (ACTIVE)

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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

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19533KCS  100V, N ch NexFET MOSFET™, single TO-220, 10.5mOhm  MOSFETs  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  -3V to -36V Vin, 1A output current, ultra-low-noise, high-PSRR, low-dropout (LDO) linear regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36-V, 1-A, 4.17-μVRMS, RF low-dropout (LDO) voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD19533KCS Download
TLV171 Download Download
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TLV2171 Download
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TPS7A33 Download Download
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TPS7A47 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 4109 30 Jul 2017
Design files (6)
Title Type Size (KB) Date
ZIP 357 13 Feb 2017
ZIP 1225 13 Feb 2017
PDF 2006 13 Feb 2017
PDF 351 13 Feb 2017
PDF 136 13 Feb 2017
PDF 698 13 Feb 2017
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Reference Designs  ( 1 )


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