DRV8873-Q1: What is the delay time for UVLO?

ryuichi.a.sakai

Part Number: DRV8873-Q1

How many seconds after the VM supply reaches 4.35V does the VM undervoltage lockout function activate?

When observing the waveform on an oscilloscope, the timing of the VM supply reaching 4.35V and the nFAULT pin going low was not the same.

over 1 year ago

0 Shinya Morita over 1 year ago

TI__Mastermind 40145 points

Hi,

Thank you for your questions.

VM UVLO react ~10us range as datasheet deglitch time, therefore seconds range delay should not happen. UVLO threshold should not be exact 4.35V, it could be a little higher or lower depending on parts. Therefore you may see some timing gap of nFAULT from your 4.35V timing.

regards

Shinya Morita

0 ryuichi.a.sakai over 1 year ago in reply to Shinya Morita

Prodigy 100 points

Thank you for your response.

What is the minimum voltage for the UVLO threshold? The datasheet provides typical and maximum values, but the minimum value is left blank.

0 Shinya Morita over 1 year ago in reply to ryuichi.a.sakai

TI__Mastermind 40145 points

Hi,

Thank you for your questions.

No min SPEC is available, but we can consider ~4.20V min as reference information.

regards

Shinya Morita

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DRV8873-Q1: What is the delay time for UVLO?