BQ24055 overcurrent detection

Vítor Pereira

Hi, I'm developing a project using the bq24055, and I'd like to know if it has some kind of charge/discharge overcurrent detection AND protection. Coul somebody help me? Thanks!

Vítor Pereira

over 9 years ago

0 Jing Zou over 9 years ago

TI__Mastermind 20570 points

The bq24055 is linear charger without power path, so the discharge path does not go through the charger. Thus no discharge overcurrent detection or protection.

Regarding on the charge ovc protection, the charger has a ISET SHORT CIRCUIT TEST. If a short is detected on ISET pin, IOUT latches off after tDGL-SHORT.

0 Vítor Pereira over 9 years ago in reply to Jing Zou

Intellectual 375 points

Why is it important to have this short detection specifically on the pin with the programming resistor instead of ont the VSS pin for example, where the load current flows?

0 Jing Zou over 9 years ago in reply to Vítor Pereira

TI__Mastermind 20570 points

This is because the current flow through ISET pin is proportional to the current go throught OUT pin. If ISET short is detected, then the IC thinks there is a excessive amount of current going out through OUT pin. Thus the output path latches off.

0 Vítor Pereira over 9 years ago in reply to Jing Zou

Intellectual 375 points

Understood, thanks!

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BQ24055 overcurrent detection