Looking for an integrated solution for driving a piezo proportional solenoid -- unipolar 0-300V range with a maximum frequency of 500Hz.
The DRV8662 came up as one possibility, but limits me to the 200V differential, which may be just ok but will restrict my maximum flow. Otherwise it seems like I'm stuck with generating my own boosted rail then using either discrete drivers or a high voltage op-amp capable of 300V+ drives.
Any other suggestions?
The highest voltage, precision operational amplifier that we have to offer is the OPA454. It is specified as a 100 V supply, 50 mA output current amplifier. Multiple OPA454 devices arranged as bridge amplifiers can produce output voltage swings of several hundred volts peak to peak. See Figures 76 and 79 in the OPA454 data sheet.
Note that the OPA454 maximum output current is about +/-50 mA. To determine if the OPA454 can produce enough output current to drive your specific piezo element not only the frequency must be considered, but also its capacitance. The peak current is determined from the i = c dV/dt relationship.
If an OPA454 arrangement can't provide enough current a HV discrete implementation may prove to be the most viable soultion.
PA - Linear Applications Engineering
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