SupertexMD1715和TC8020高清医疗超声图像解决方案

Supertex公司的 MD1715和TC8020是高清医疗超声图像应用芯片组。MD1715是两路五级高压高速脉冲发送芯片，采用先进的CMOS技术，±4.5 到12.5V工作电压，输出电流2A，1nF负载的上升和下降时间6.5ns，传输时延10ns，1.8V-3.3V CMOS逻辑电平，而TC8020由六对高压低阈值N沟和P沟MOSFET组成，集成了栅极-源极电阻和齐纳二极管，50V时的峰值电流+/-3.5A。本文介绍了MD1715和TC8020主要特性。MD1715和TC8020典型应用电路，以及详细电路图。

The Supertex MD1715, paired with the Supertex TC8020, forms a two channel, five level, high voltage, high speed transmit pulser chip set. The chip set is designed for medical ultrasound imaging applications, but can also be used for metal flaw detection, nondestructive evaluation, and piezoelectric transducer drivers.

The MD1715 is a two channel logic controller circuit with 12 low impedance MOSFET gate drivers. There are two sets of control logic inputs, one each for channels A and B. Each channel consists of three pairs of MOSFET gate drivers. These drivers are designed to match the drive requirements of the Supertex TC8020.

The TC8020 is the output stage of the pulser, with six pairs of MOSFETs. Each pair consists of a P-channel and an N-channel MOSFET. They are designed to have the same impedance and can provide typical peak currents of ±3.5 amps at 200V.

MD1715主要特性：

Advanced CMOS technology

±4.5 to 12.5V power supply voltage

2A output source and sink current

6.5ns rise and fall time with 1nF load

10ns propagation delay

±2ns matched delay times

12 matched channels

1.8V to 3.3V CMOS logic interface

Smart logic threshold

Low inductance package

MD1715应用：

Medical ultrasound imaging

Piezoelectric transducer drivers

Metal flaw detection

Nondestructive evaluation

The Supertex TC8020 consists of six pairs of high voltage, low threshold N- and P-channel MOSFETs in a 56-lead QFN package.

All MOSFETs have integrated gate-to-source resistors and gateto-source Zener diode clamps which are desired for high voltage pulser applications. The complimentary, high-speed, high voltage, gate-clamped N- and P-channel MOSFET pairs utilize an advanced vertical DMOS structure and Supertex’s well-proven silicon-gate manufacturing process. This combination produces a device with the power handling capabilities of bipolar transistors and with the high input impedance and positive temperature coefficient inherent in MOS devices.

Characteristic of all MOS structures, this device is free from thermal runaway and thermally-induced secondary breakdown. Supertex’s vertical DMOS FETs are ideally suited to a wide range of switching and amplifying applications where very low threshold voltage, high breakdown voltage, high input impedance, low input and output capacitance, and fast switching speeds are desired.

TC8020主要特性：

High voltage, vertical DMOS technology

Integrated gate-to-source resistor

Integrated gate-to-source Zener diode

Typical peak output +/-3.5A at 50V

Low threshold, low on-resistance

Low input & output capacitance

Fast switching speeds

Electrically isolated N- and P-MOSFET pairs

TC8020应用：

High voltage pulsers

Amplifiers

Buffers

Piezoelectric transducer drivers

General purpose line drivers

Logic level interfaces

图1。MD1715和TC8020典型应用电路

图2。MD1715和TC8020引脚布局图

图3。MD1715和TC8020详细电路图