Hi TI Team,
I would like to know how TPS22950-Q1 will behave if we have a;
i) Open circuit in the output
ii) Short to 12V supply in the output
iii) Short to ground in the output
Our requirement is that the microcontroller wants to know these fault cases. Can somebody help me which all will be possible and how?
Thanking you in advance.
Hemanth
Hemanth,
For open-load and short-to-supply there is reverse current blocking on the device. This means that if there is a sufficiently higher voltage on the output versus the input (such as short-to-battery) then the reverse current protection will trigger and the FLT pin will go low:
For short-to-ground, the configured current limit will kick in within the activation time (around 5uS) and protect the circuit.
If you need any more advanced diagnostics to explicitly detect open-load as well as drive inductive loads, I would recommend a high-side switch such as the TPS1H000A-Q1.
Best Regards,
Timothy Logan
Applications Manager - Power Switches
Hemanth,
I would recommend referring to section 8.3 and 8.4 in the datasheet:
and
During a sole short-to-ground event the current limit itself will not trigger the fault pin, however the subsequent thermal fault will.
