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Trouble in PB51's datasheet

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when I use PB51A to drive my PZT,I find that the force of PZT is so small.
So I doubt that the current from the PB51 is enough . I adjust the RCL to the

limitation to increase the output current the force .But the force also cann't

satisfy with my need.
How can I increase the current and don't change the chip.

The datasheet has 3 AV values.
"Av (booster) = (6.2K/3.1K) + 1 = 3
Av (composite) = 60K/2K = – 30
Av (driver) = – 30/3 = –10"
what's the meaning?
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