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Part Number: DRV2700
I am trying to get a haptic feedback using piezo with DRV2605/DRV2700 (based on application report SLOA255).When using the DRV2700 with a signal from DRV2605, there is no feedback can be felt. I also notice that the FB pin does not output 1.3V. Thus my PVDD signal is around 10V instead of 65V.
Piezo that is used for haptic feedback - Z63000Z2910Z 1Z 2 (www.digikey.ca/.../j2rm8v)
Attached is the schematics of the haptic driver circuit (the jumpers are set for position for the piezo driver), power supply section and scope reading of SW pin.
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In reply to Ivan Salazar:
Sorry for not replying sooner. I tested my circuit without actuator and no input signal on pins IN+ and IN-. As soon as EN pin goes high there are dips in supply voltage line and there is no voltage on FB pin. The SW pin has the same pattern as on original image.
In reply to Leonid Hrapunsky62:
Happy New Year. I apologize for not replying sooner. I did place a 10µF capacitor in parallel to C10. The results are the same as before. As soon as the EN signal goes high, the 5V supply drops to approx. 3V.
I did test continuity as much as I could (considering the part does not have accessible pins). I did not see any issue with continuity.
This problem is seen on a number of prototype boards. The reason for long reply was I was looking for another board I created for a different application but using the same design. The results are the same.
Is it possible that I am damaging the component somehow and the results that I see are due to the failed device? What are potential failures that the device can sustain that will provide me with such a problem? I have a few boards that were never powered, what would be the best way to test these?
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