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

(ACTIVE) TIDA-01458

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Key Document

Description

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.

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 synchronization with ultrasound master or system clock frequency

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


  




TI Devices (6)

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
LM73605  3.5V to 36V, 5A Synchronous Step-Down Voltage Converter  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
LMR14050  40V, 5A SIMPLE SWITCHER, 2.2MHz Step-Down Regulator with 40μA IQ  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
TL431A  Adjustable Precision Shunt Regulator  Voltage Reference  Sample & Buy Not Available
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 2192 29 Sep 2017 60
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1681 29 Sep 2017 25
ZIP 3206 29 Sep 2017 49
PDF 1425 29 Sep 2017 39
PDF 305 29 Sep 2017 32
PDF 197 29 Sep 2017 38
PDF 363 29 Sep 2017 108
Related Tools & Software

Reference Designs (1)



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