TPS548A29: “LATCHED” or “AUTO-RETRY” for OVP faults?

Kazuhiko Hirano

Part Number: TPS548A29

David,

Thank you for your response to the following e2e thread
(+) TPS548A29: latch-off or re-start when OV fault? - Power management forum - Power management - TI E2E support forums

But I am still a bit confused. Maybe my question was not clear.
The statement “After the 68-µs UVP delay time, the device enters hiccup mode and re-starts with a sleep time of 14-ms.” means TPS548A29 latches off once, but automatically retries startup after 68us + 14ms?
For example, at eFuse product, it has either “LATCHED” or “AUTO-RETRY” for faults.
So, when TPS548A29 gets OVP fault, which behavior does it take, “LATCHED” or “AUTO-RETRY”?

Best regards,

K.Hirano

over 4 years ago

0 David_Daniels over 4 years ago

TI__Mastermind 21955 points

OVP is latched. UVP is auto retry. The datasheet is confusing and need updating.

It should read as follows for OVP

When the FB voltage becomes higher than 116% of the VREF voltage, the OVP comparator detects and the circuit latches OFF the high-side MOSFET driver and turns on the low-side MOSFET until reaching a negative current limit INOCL. Upon reaching the negative current limit, the low-side FET is turned off, and the high-side FET is turned on again for the on-time determined by VIN, VOUT and fSW. The device operates in this cycle until the output voltage is pulled down under the UVP threshold voltage for 64 µs. After the 64-µs UVP delay time, both high-side and low-side FET latch off. The fault is cleared with a reset of the input voltage or by re-toggling the EN pin.

0 Kazuhiko Hirano over 4 years ago in reply to David_Daniels

TI__Genius 13958 points

David,

Thank you for your confirmation.

Best regards,

K.Hirano