AN3240 Datasheet, PDF (1/32 Pages) STMicroelectronics – Ultrasound HV pulser demonstration board

AN3240
Application note
Ultrasound HV pulser demonstration board
Introduction
This application note describes all the possible demo applications helpful in carrying out a
full evaluation of STHV748 functions.
The STHV748 high-voltage, high-speed pulser generator features four independent
channels. It is designed for medical ultrasound applications, but can also be used for other
piezoelectric, capacitive, or MEMS transducers.
The device contains a controller logic interface circuit, level translators, MOSFET gate
drivers, noise blocking diodes, and high-power P-channel and N-channel MOSFETs as
output stages for each channel. There is also a clamping-to-ground circuitry, anti-leakage,
an anti-memory effect block, a thermal sensor, and a HV receiver switch (HVR_SW), which
guarantees a strong decoupling during the transmission phase.
Moreover, the STHV748 includes self-biasing and thermal shutdown blocks (see block
diagram in Figure 1). Each channel can support up to five active output levels with two half
bridges. The output stage of each channel is able to provide ±2 A peak output current. In
order to reduce power dissipation during continuous wave mode, the peak current is limited
to 0.6 A (a dedicated half bridge is used).
December 2010
Doc ID 17689 Rev 1
1/32
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