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| DRV2700 HV piezo driver problem [SOLVED] |
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| NiHaoMike:
Simpler solution to try: remove the 100k resistors, then remove and bypass the driver transistors so the logic signal directly drives the low side output MOSFETs. Then put the 100k resistors so that when one side of the bridge is pulled low, the other side is pulled high. |
| Unixon:
--- Quote from: NiHaoMike on August 18, 2019, 04:37:25 pm ---Simpler solution to try: remove the 100k resistors, then remove and bypass the driver transistors so the logic signal directly drives the low side output MOSFETs. Then put the 100k resistors so that when one side of the bridge is pulled low, the other side is pulled high. --- End quote --- Did I get it right that your suggestion is to use low side MOSFETs to drive both load and high side MOSFETs? I know this configuration but I have to think about its applicability. The bridge works at potentially high voltage (150V max operational by design, MOSFETs are 250V rated), so I have to both protect gates and keep channels wide open when enabled so they are intentionally driven to saturation (+/-15Vgs) whenever possible. Also I want an additional layer of isolation from between output stage and MCU so that in a fault condition they only fry themselves but not the entire board. |
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