400-W continuous, scalable, ±2.5- to ±150-V, programmable ultrasound power supply reference design

The TIDA-01352 enables modular and efficient power scaling capability by providing a solution for digitally programmable power supply for powering ultrasound transmit circuit. The design uses push-pull topology to generate high-voltage (HV) and low- (LV) or MID- voltage power supplies. The HV rails are programmable from ±50V to ±150V, whereas the LV or MID rails are programmable from ±2.5V to ±50V. The power supply is capable of providing a continous power of 100-W on each rail. The programmability is implemented using onboard, 12-bit digital-to-analog converters (DACs). All the power supply rails are capable of being synchronized to a master clock. The design is scalable and modular allowing same supply to be duplicated or removed depending on number of channels and number of levels of pulser. The reference design also consists of other LV power supplies necessary for the pulser operation. This reference design is ideal for the high-voltgae DC-DC boost stage to use in conjuction with the floating (post) regulator design TIDA-01371.

Features:

• High-efficiency (89% at full load with 24-V input) push-pull topology enables scalability for lower or higher power (channel counts)
• Independent positive and negative voltage power supplies helps achieving bipolar functionality for up to 192 digital pulser and linear amplifier transmit channels
• Modular design allows same supply to be duplicated or removed depending on number of levels for pulser
• Capable of switching frequency synchronization with ultrasound master or system clock frequency – helps in better harmonics rejection
• Onboard, 12-bit, quad DAC enables digital programmability for output from ±2.5V to ±150 V (each rail can support 100-W continuous power and 350-W peak power)
• Common power supply for pulser driver (to support B-Mode, CW-Mode, and elastography mode), internal level-shifters, and logic enables consolidation to single board design

Parts include:

CDCE937              Programmable 3-PLL VCXO Clock Synthesizer with 2.5-V or 3.3-V LVCMOS Outputs 

CSD17381F4        30V, N-Channel FemtoFET™MOSFET 

CSD19506KCS     80V, N-Channel NexFET™ Power MOSFET 

DAC60004            Ultra-Small, true 12-bit quad voltage output DAC with 1LSB INL/DNL  

LM5030                100V Push-Pull Current Mode PWM Controller 

LMZ34002            SIMPLE SWITCHER® 4.5V to 40V, 2A Negative Output Power Module 

LMZ34202            SIMPLE SWITCHER®, 4.5V to 42V, 2A Step-Down Power Module in QFN Package 

REF5050               3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference 

TLV171                 36V Low-Power RRO General-Purpose Operational Amplifier 

TLV2171               36V, Low Power, RRO, General Purpose Operational Amplifier 

TPS7A49               Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator 

Learn more by downloading the reference design below