SLOA198A September 2014 – December 2021 DRV2665 , DRV2667 , DRV2700 , DRV8662
The Piezo load requires approximately 1.88 mA of average current based on the following equation:
Piezo Actuator Current Requirements (Approximate) | |
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Iout_max = 2π × Cactuator × Vboost × ƒin_max | Iout_max =
1.884956 mA Maximum required amplifier current (estimate) |
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Ibat_max = 139.626 mA Maximum VBAT current |
This means that the inductor current limit (REXT) must be sufficiently large to support 1.88 mA.
The DRV8662EVM inductor is already fixed, but from here forward you may choose a different inductor that fits your load requirements. The maximum boost current with 80 Vp boost voltage is 20.3 mA based on the 4.7 µH / 1.8 A Coilcraft inductor selected using the following equations:
Boost Converter Current Capacity (Approximate) | |||||||||
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D = 0.978 Estimated duty cycle at maximum frequency |
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Iboost_max = 20.289 mA Maximum boost output current estimate |
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Vboost (V) | IOUT (mA) | |||||||
25 | 64.92 | ||||||||
50 | 32.46 | ||||||||
75 | 21.64 | ||||||||
100 | 16.23 | ||||||||
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