MD1716 THREE LEVEL, THREE CHANNEL MOSFET DRIVER FROM SUPERTEX DELIVERS HIGH PERFORMANCE IN ULTRASOUND APPLICATIONS

MD1716 Minimizes Power Consumption While Providing Superior Imaging

Supertex recently introduced MD1716, a three channel logic controller with twelve low impedance MOSFET gate drivers. When paired with a complementary MOSFET array, such as the Supertex TC8020, MD1716 forms a three channel, three level, high voltage, high speed, transmit pulser chip-set for high resolution imaging in medical ultrasound applications.

MD1716 has two separate gate drive voltage controls to minimize power consumption. It generates a three level waveform that is well-suited for CW, PW, and color Doppler ultrasound imaging. The IC has +/-2ns matched delay times, a 10ns propagation delay and a 6.5ns rise and fall time with a 1.0nF load.

“The small footprint and power efficiency of MD1716 make it ideally suited for today’s portable medical diagnostic ultrasound imaging systems,” states Stephen Lin, Vice President of Marketing for Supertex. “As demand for medical care access continues to increase, form factor reduction becomes an urgent requirement for portable systems. Supertex, with our growing family of new ultrasound products, is poised to meet and exceed the requirements of all system designers.”

MD2134 HIGH SPEED ULTRASOUND BEAMFORMING SOURCE DRIVER FROM SUPERTEX INCORPORATES EIGHT-BIT PULSE AMPLITUDE MODULATION

Programmable MD2134 Has Fifteen Independent Output Level Registers

Supertex recently introduced MD2134, a high speed source driver to be used in a pulsed current waveform generator for medical ultrasound imaging machines. The IC can also be used in non-destructive image testing, such as metal flaw detection, and sonar phase array applications.

MD2134’s output stage is designed to be the source driver for a depletion MOSFET array, such as the Supertex DN2625DK6-G. The IC features pulse amplitude modulation with eight-bit resolution and fifteen programmable output level registers. Each level can be programmed to a resolution of +/-127. Its high speed serial-to-parallel interface allows per- scan-line data to be updated quickly for dynamically changing delay times, weighting and waveforms. An apodization digital-to-analog converter smoothes irregularities in the waveforms.

“MD2134 is optimized for delivering high resolution images in high performance, low power, medical diagnostic ultrasound machines,” states Stephen Lin, Vice President of Marketing for Supertex. “By utilizing pulse amplitude modulation, MD2134 delivers virtually no propagation delay or time jitter from input to output.”

HV9861A PATENTED LED DRIVER FROM SUPERTEX DELIVERS HIGH CURRENT ACCURACY VIA AVERAGE MODE CONTROL

HV9861A Achieves High Accuracy Without High-Side Current Sensing

Supertex recently introduced HV9861A, an open loop, average current mode control, LED driver integrated circuit (IC) designed to drive LEDs using a buck topology. It is well suited for a variety of solid-state lighting applications, including TV and monitor backlighting, signage, decorative, and general lighting.

Because of the patented, novel scheme of current control it employs, HV9861A doesn’t produce a peak-to-average error like many LED driver ICs, and therefore, it greatly improves the accuracy and line and load regulation of the LED current. The IC provides typical current accuracy of +/-3% and requires no loop compensation or high-side current sensing because of its proprietary, patented control scheme. The internally regulated voltage (Vdd) for HV9861A is 7.5V.

“By utilizing Supertex’s patented average-mode current sensing technology, HV9861A achieves fast and accurate LED current control in a wide variety of LED lighting applications,” states “The HV2662 and HV2762 extremely accurate current control Stephen Lin, Vice President of Marketing at Supertex. “The combine Supertex’s proven expertise of this IC serves to prolong the lifetime of LEDs, thus making it well suited for manufacturers seeking durability and reliability in their end LED lighting products.”

HV9801A SWITCH DIMMABLE LED DRIVER FROM SUPERTEX WORKS WITH ANY STANDARD, SIMPLE, NON-PHASE DIMMER LIGHT SWITCH

HV9801A Allows Dimming of LED Bulbs and Tubes Without Any Requirement for a Dimmer Switch. It Is Ideal For Replacing Existing Fluorescent Tubes Because They Never Had Phase Dimmer Switches

Supertex recently introduced HV9801A, a power saving, switch dimmable, LED driver integrated circuit (IC) designed to drive LEDs in dimmable household and office lighting applications. The IC dims LED lamp brightness to one of four preset levels through simple, rapid toggling of a light switch. Light levels progress up and down sequentially and if the switch is turned off for more than a second, the lamp returns to full brightness.

Switch dimming offers an attractive alternative to TRIAC dimming as it enables dimming of lamps in any location, provides a better quality light source without flicker, and increases energy efficiency through the reduction of the excess circuitry required to accommodate the holding current of the TRIAC dimmer. HV9801A works with all existing light switches and doesn’t require installation of a wall dimmer.

As opposed to many LED driver ICs that utilize peak current control to regulate output current, HV9801A employs a patented average-mode current control method that requires no loop compensation or high side sensing. This proprietary, patented control method provides quick and accurate response to input voltage fluctuations and delivers exceptional accuracy (+/-3%) and line and load regulation of the LED current.

“HV9801A is an ideal driver solution for solid-state lighting applications that utilize dimming,” states Stephen Lin, Vice President of Marketing at Supertex. “The IC further builds on Supertex’s history of innovation and recognized leadership in the off-line LED driver IC market.”

CL220 LINEAR LED DRIVER FROM SUPERTEX PROVIDES A SIMPLE, HIGH VOLTAGE DRIVING SOLUTION

Temperature-Compensated CL220 Delivers a Constant, 20mA Current at Input Voltages Up To 220V

Supertex recently introduced CL220, a high voltage, temperature- compensated, constant current, LED driver integrated circuit (IC). It is designed to drive a string of LEDs with a constant current of 20mA, and multiple ICs can be used in parallel to provide higher output currents in increments of 20mA. It can be used in a variety of solid-state lighting applications, such as signage, automotive, industrial indicators and accent lighting.

CL220 operates from 5 to 220V, and is trimmed to provide a constant output current of 20mA (+/-10%) at an input voltage of 5 to 160V. It can be used as a two terminal constant current source or constant current sink. CL220’s temperature-compensated output current maintains consistent LED brightness regardless of temperature fluctuations. The IC also withstands transients without the need for any additional transient protection circuitry when used as recommended.

“CL220 is the latest in a long line of simple, cost-effective linear LED drivers from Supertex,” states Stephen Lin, Vice President of Marketing at Supertex. “The two terminal device makes system design so simple and easy, and the fact that the device can be used in parallel adds a great amount of versatility to its output current specifications.”

HV2733 NEW SIXTEEN-CHANNEL ANALOG SWITCH FROM SUPERTEX PROVIDES EFFICIENT CONTROL OF HIGH VOLTAGE SIGNALS

HV2733 Reduces Signal Attenuation Through Low Parasitic Capacitance

Supertex recently introduced HV2733, a sixteen-channel, high voltage, analog switch with integrated bleed resistors. It is well-suited for applications where low voltage signals control high voltage switching, such as in medical ultrasound imaging, metal flaw detection through non-destructive testing (NDT), optical MEMS modules, and piezoelectric transducers.

The outputs of HV2733 are configured as single pole, double throw, analog switches that feature low typical on-resistance of 18 ohms under typical operating conditions. This low switch resistance minimizes signal attenuation in the receive mode and provides two ampere current capability in the transmit mode.

“HV2733 expands Supertex’s family of multi-channel, high voltage, analog switches for demanding medical ultrasound imaging applications,” states Stephen Lin, Vice President of Marketing for Supertex. “The IC’s channel density and integrated bleed resistors make it a good choice for designers seeking sharper imaging quality and fewer erroneous signals.”

CW01 NEW FOUR CHANNEL, CONTINUOUS WAVE TRANSMITTER FROM SUPERTEX MINIMIZES PHASE NOISE AND POWER CONSUMPTION

CW01 Features High Speed D Flip-Flop and High Speed MOSFET Gate Driver

Supertex recently introduced CW01, a four channel, low phase noise, continuous wave transmit IC designed for use in transmitters of diagnostic medical ultrasound machines and fluid flow measurement devices. The IC continuously sends a constant amplitude wave into the region to be examined. A resistor then processes the echo of the wave signal for frequency shifts.

CW01 features a high speed D flip-flop and a high speed MOSFET to minimize phase noise to a typical level of -171dB below carrier. The D flip-flop allows CW01’s input frequency to be aligned to a high frequency clock. When a logic high is clocked into the D flip-flop, the N-channel MOSFET is turned on. Data are then clocked in during the low to high transition. The IC also features VDD and VLL undervoltage lockout to prevent spurious turn-on. It is the first integrated continuous wave transmitter in the market. It is more cost-effective, better performing, and takes up less space than the discrete solutions.

“By providing very high speed data clocking, CW01 generates very little phase noise, and thus delivers highly accurate ultrasound images,” states Stephen Lin, Vice President of Marketing for Supertex. “The capability of the IC to withstand transmit voltages up to 100V allows for higher power scans and deeper body tissue imaging.”

HV2808 SUPERTEX’S NEW HIGH VOLTAGE, ANALOG SWITCH OCCUPIES LESS BOARD SPACE THAN ELECTROMECHANICAL RELAYS IN MEDICAL ULTRASOUND PROBES

HV2808 Reduces PCB Area and Increases System Reliability

Supertex recently introduced HV2808, a thirty-two channel, high voltage, analog switch IC designed for use in medical ultrasound imaging systems as a probe selection device. It replaces the typical electromechanical relays performing the probe selection function and takes up less printed circuit board (PCB) area, emits no audible noise and increases system reliability.

HV2808 serves as a sixteen-pole, double throw (16PDT), high voltage switch array. Using Supertex’s proprietary HVCMOS technology, the IC efficiently controls analog signals with low power CMOS logic and high voltage bilateral DMOS switches. It features a very low quiescent current of 10uA for low heat dissipation and a DC analog signal frequency to 50MHz for wide bandwidth response for any type of ultrasound probe.

“Using HV2808 to select medical ultrasound probes offers a number of advantages over electromechanical relays,” states Stephen Lin, Vice President of Marketing for Supertex. “First, it comes in an 8x8x1mm QFN-56 package, so it not only saves on PCB area, but also on height. Second, HV2808 emits no audible noise, and third, the IC can switch from one probe to another in about 30us.”

HV2801/HV2809 THIRTY-TWO CHANNEL ANALOG SWITCHES FROM SUPERTEX PROVIDE SUPERIOR PERFORMANCE AND BOARD DENSITY

HV2801 and HV2901 Deliver High Resolution Medical Ultrasound Images

Supertex recently introduced two new high voltage, thirty-two channel analog switches—HV2801 and HV2901. Both ICs offer robust latch up protection and quiescent current of less than 10uA, producing optimal efficiency in attenuation and controlling high voltage analog switching with a low voltage signal. The ICs excel in applications such as diagnostic medical ultrasound imaging, non-destructive metal flaw detection, inkjet printer heads and piezoelectric transducer drivers.

HV2801 and HV2901 feature 18 ohm on-resistance to minimize return signal attenuation, serial shift registers that reduce I/O connections in space- constrained applications, and up to 200V operating voltage for deeper body tissue imaging capability. Both ICs may be utilized with multiple combinations of high voltage supplies to accommodate different operating modes in diagnostic medical ultrasound imaging, such as +40V/-160V, +100V/-100V, +160V/-40V, (Vpp/ Vnn). The HV2901 also features integrated bleed resistors to discharge residual DC voltages and reduce erroneous signals.

“The HV2801 and HV2901 deliver very high channel density for space-constrained portable medical ultrasound applications,” states Stephen Lin, Vice President of Marketing for Supertex. “These ICs leverage Supertex’s proven expertise in high voltage analog signal control with our proprietary HVCMOS technology to produce very efficient and robust analog switches.”