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DRV8876EVM: DRV8876 output voltage drop issue.

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Part Number: DRV8876EVM

When the DRV8876 EVM is set in the unlimited current mode, and PWM is tested 100% duty output, found that when output current is higher, the output voltage will dropped, from 8.4V drop to 6~7V, Please help response which one setting need to modify from EVM?

The test conditions are as follows:
(1) Vm voltage input 8.4V
(2) Used the Electronic load setting to CC mode 1A