TPS544C25: Comp pin maximum source current

Hi Christopher,

   The information is available in the electrical characteristics table under "Error amplifier and feedback voltage" section.

Regards,

Gerold

Hi Gerold,

The data given is for the minimum current.  I need the maximum current.

Hi Christopher,

     How do you plan to use the maximum current? 

Regards,

Gerold

I plan to pull down on the COMP pin for my external over-voltage protection.  I want to make sure I can sink enough current to have my external error amplifier regulate the output voltage.

Hi Christopher,

      In such a case, you want to design with the min current. If you design for the maximum, the part to part variations cannot ensure that the error amplifier will have enough sink current to keep the COMP pin pulled low enough when the error amplifier actually has a lower sink current.

Regards,

Gerold

Christopher,

The Error Amplifier Output (COMP) has an internal current limit to protect the error amplifier circuitry from damage due to a manufacturing defect that shorts the COMP pin to ground or momentary shorting the COMP pin to ground, the internal current limit is not rated for continual operation into a short or to drive an external circuit that is over-driving the COMP pin.  Continual operation of the COMP in current limit can degrade the performance of the error amplifier over time and may eventually result in damage.

An external test circuit that will momentarily over-drive the COMP pin for testing purposes should be deigned to hand a minimum of 10mA source current.

There is no internal SINK current limit, attempting to over-drive the COMP pin with an external supply that is capable of driving more than 1mA of current could result in immediate damage to the COMP.

Hi Peter,

So there is no data for the maximum on the internal current limiting, correct?  I will have to test this to determine that value.