Reference Design for 25W High Voltage Programmable Power Supply for Ultrasound Transmit(TIDA-01592)Thisreference design provides a solution for digitally programmable non-isolated power supply for powering Ultrasound transmit circuit. It uses Fly-back Power Supply topology with the use of single transformer to generate Dual Programmable High Voltage upto absolute value of 100 V. This design is targeted for low power portable Ultrasound Scanners. The design can deliver a maximum continuous power of 25 W with 12.5 W each on individual rails. The High Voltage (HV) rails are programmable from 0 V to ±100V through a set dc voltage. The programmability through DAC can be implemented using 12-bit DACs which can be referenced from TI design TIDA-01352. All the power supply rails are capable of synchronizing 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.
ВозможностиOperates from 24V supply with wide range of frequency from 100kHz to 500kHz with digitally programmable dual output from 0V to +/- 100V with peak efficiency of 87% at full load Non-isolated common power supply for bias and pulser driver (to support B-mode, CW-mode and elastography mode) Capable of powering up to 192 digital pulser channels – flyback topology enables scalability for lower/higher channel counts Capable of switching frequency synchronization with ultrasound master or system clock frequency – helps in better harmonics rejection Modular design allowing same supply to be duplicated or removed depending on number of levels for the pulser Current mode control provides superior bandwidth and transient response with cycle by cycle current limiting
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