AN4471 datasheet(21/39 Pages) STMICROELECTRONICS

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AN4471

Hardware layout and configuration

Further customized patterns based on test requirements for final applications can be

uploaded by the user into the remaining memory slots (through the.dfu file - see user

manual UM1083).

3.5

STHV800 stage

The STHV800 high-voltage, high-speed pulser generator features eight 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. It also includes clamping-to-ground circuitry, anti-leakage,

an anti-memory effect block, a thermal sensor and a HV receiver switch (HVR_SW) that

ensures strong decoupling during the transmission phase.

The STHV800 also features self-biasing and thermal shutdown blocks (see Figure 14).

Figure 14. STHV800 single channel block diagram

Each channel can support up to three active output levels with one half-bridge. Each

channel consists of two supplied output stages for pulsed wave (PW) and continuous wave

(CW) operations. The PW output stage is able to provide up to ±2 A peak output current

while, to reduce power dissipation and jitter during continuous wave mode, the fully

optimized CW output stage delivers up to ±0.3 A.

Note:

For further information, please refer to the STHV800 datasheet.

The STEVAL-IME009V1 allows the user to configure the special pins on the STHV800, see

Table 18. A brief explanation of the use and functionality of these pins is given below:

• THSD is a thermal flag. The output stage of the THSD pin is a NMOS channel open-drain,

so it is necessary to connect the external pull-up resistance (R

≥ 10 kΩ) to the positive

low-voltage supply (see Figure 11). If the internal temperature exceeds 160 °C, THSD

HVM_CW

HVP_CW

HVM

HVP

Clamp

TRswitch

LVOUT

XDCR

GND_PWR

PCW

NCW

Clamp

NCW

PCW

INx_0

INx_1

AGND

Clamp

Noise

blocking

diodes

AM10224V1

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