Hello everybody,
I'm delving in an embedded project that needs among other things to move some optical elements using some piezo PZT stack actuators . Big deal, I thought in the beginning . The current drive requirements are low, short pulses of up to 30mA , with a low duty cycle, and operating voltage of up to
60Vdc , single source . When it came the time to implement a solution, Apex came to mind . Surprise, they only have now all sorts of high power devices , astronomically priced, in huge TO-3 or TO-220 packages, running up to hundreds of volts and delivering up to several Amps in capacitive loads. I started searching all the good old opamp makers and some specialty high voltage opamp houses . Burr Brown, swallowed by TI, Elantec, swallowed by Intersil, Analog DEvices, no high voltage , Maxim, no high voltage , Linear Tech , no high voltage , Natsemi, no high voltage . Apex , lots of 1000V/10A/$100 devices , in TO-3 packages ! I looked at audio amps as well, in the hope of finding that elusive $2 , surface mount plastic package that would run at 60Vdc, which is what I need . No such luck yet.I'm asking here, although this is not strictly embedded , maybe someone knows of a current produciton device with the following specs:
-opamp
-operating supply voltage up to 60Vdc , or higher , to allow an approximate output swing of 60V , or split supply of +/-30V or higher if not rail to rail output , to allow the same output swing of 60v.
-max output current 30mA pulses shorter than 1ms , repeated with a max duty cycle of 20% .
-plastic package, SMD .
-low cost, under $4.
-multiple , dual or quads would work even better.
Any pointers would be greatly appreciated.
thank you, matt tudor