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acquisitionZONE Products for the week of October 5, 2009
Cirrus Logic Says…
PA107DP: Driving Piezoelectric Market With Two New Single Package Solutions
New Standards for Combination of Speed, Voltage and Current, Including an Industry First 3000 V/µs Slew Rate
Cirrus Logic Inc. has delivered new levels of performance for the piezoelectric driver market with the addition of the PA107DP and MP103FC high-voltage, high-speed power amplifiers to its Apex Precision Power product family. The PA107DP is capable of slew rates up to 3000 V/µs, which raises the bar for single-package hybrids. The MP103FC is a new dual-channel designed hybrid that can deliver a very high 15 A X 2 of output current. Both devices are operational with voltage supplies of up to 200 V.
The PA107DP is an attractive option for driving piezos used in medical imaging and ultrasound applications, as well as programmable power supplies for the ATE market, because the high slew rate increases voltage response time. The end result is greater accuracy and rapid delivery of voltage throughout the end system, enabling imaging scans that take less time to complete and power supplies that cycle with greater efficiency, for example. Customers needing higher speed will select the PA107DP because it extends the available slew rate performance within the Apex Precision Power product family by 3X that of the PA85, which features a 1000 V slew rate. The PA107DP also improves output current performance with 1.5 A/5 A PEAK, and a high-gain bandwidth of 180 MHz. The device is housed in a 12-pin Power SIP package that requires less than two square inches of board space.
“Through the Apex Precision Power brand of products, Cirrus Logic has a long history of innovation in the piezo drive market for high-voltage, high-speed products,” said Greg Brennan, vice president and general manager, Cirrus Logic Apex Precision Power business unit. “We continue to see rapid acceptance of off-the-shelf piezo drive technology in new market segments, such as medical imaging, where larger discrete solutions have been more typical. With the introduction of the PA107DP and MP103FC, we continue to expand the performance parameters of single-packaged IC and hybrid piezo drivers that can be easily retrofitted into existing systems or prototyped for next generation designs.”
EN-Genius Says…
The MP103FC is a dual channel amplifier than can drive up to 15 A per channel; but it is not the star of this release. That would be the PA107DP.
With a Class-AB biased MOSFET output stage the PA107 can drive up to 180 V p-p, and can sink/source currents up to ±5 A peak, ±1.5 A steady-state. Feed-forward topology gives the part a bandwidth of 180 MHz, with a power bandwidth of at least 2 MHz at 170 V p-p output. Slew rate is an astounding typical 3000 V/µs and settling time is 12 µs. Open-loop gain is a typical 140 dB at dc and 40 dB at 1 MHz.
Input impedance is 13 GΩ (minimum) in parallel with 2 pF. The input range extends to within 2 V of the auxiliary voltage rail which maxes out at ±18 V. The main supply can extend to 200 V between positive and negative rails.
This part is, of course, a hybrid. It would not be possible with today’s technology to build it as a monolithic product. Thin film resistors and ceramic capacitors are used throughout, together with the semiconductors. The bond wires are connected ultrasonically for wide operating temperatures: -25ºC to +85ºC.
With a part like this – with limited internal protection – it can be very easy to push past the internal power dissipation limit, which in this case is an absolute maximum rating of 62.5 W. It will probably tolerate more, for a period, but life will certainly be shortened.
The hybrid production area at Apex is, I can attest, superb and a lot of extremely good analog engineers have both passed through its portals and are there now. The PA107DP will be hugely popular in driving unusual and difficult loads like piezo devices and high-power RF control circuits but its Class-AB linearity leaves it open to numerous signal driving circuits and ATE. I could not comment properly on the pricing without a great deal of research but I would suspect that you would probably not be able to match the cost with a discrete design – which would be a great deal more difficult and require real analog design resources: and time. I would predict that the PA107 will be a high volume, high margin part with no civilian competition that I know of out there.
The PA107DP and the MP103FC are both in production with samples available. The PA107DP is in SIP-12 with a heatsink attachment flange. Formed leads are also available. The PA107DP is priced at $165.55 and the MP103FC is priced at $85.04, both in 1000-piece lots.
Product Page PA107DP
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