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Hi,
1. The TPS736 datasheet have the separate specification for current Limit and short circuit current. But in many other datasheet have only current limit. I feel in TPS736, short circuit and current limit is different.
Below sharing my understand on this, please correct me if my understanding on this is wrong.
A): At Current limit condiction : Output voltage will be stable (3.3V in the case of 3.3V LSO) and current will be same (Limiting current of Max of 800mA) even though the load varies.
B). Short Circuit condiction: Output voltage will be zero and current will be settle to 400mA (typ) .
2. First Test condition for current limit is Vout=0.9xVout(nom), please let me know, how this condition is achieved since the output voltage of LDO is fixed ?
Vout(nom) : Is the typical value of LDO output (3.3V in case of 3.3V LDO) ?
Regards
Anuraj NK
Hi Anuraj NK,
The reason that you see both a current limit line and a short circuit current limit line in the Electrical Characteristics table is that TPS736 has a foldback current limit. Unlike a traditional "brick-wall" current limit where the current limit is the same value regardless of output voltage, a foldback current limit has a lower current limit at lower output voltages. This helps protect the LDO in the event of a short circuit.
When we test the current limit for the LDO, we force the output voltage to 90% of its nominal value (ie we force 2.97 V for TPS73633 which has a nominal 3.3 V output)
Very Respectfully,
Ryan
Hi Ryan,
I have one more query regarding the Feed back pin current testing.In TPS730 datasheet the specification is below.
For testing this, Need to force 1.8V from ATE to FB pin and check the current ?
What should be the status of output voltage that time? I fell the output wont be stable.
Please suggest the steps to validate this parameter.
Regards
Anuraj NK