In LTC3774 datasheet page 16 regarding Inductor DCR sensing if we disable the SNSD+ pin will we:
If the SNSD+ pin is shorted to ground, a separate sense resistor is not required. An RC filter tied to the SNSA+ pin (R2&C2 in Figure 4) is all that is required. For applications using DCR sensing with SNSD+ disabled, keep in mind the following:
Thanks Mike! Exactly what I wanted to clarify.
In the burst Mode Operation, It is mentioned that Inductor Peak current is limited to 1/3 of maximum sense voltage irrespective even if voltage of Ilim indicates a lower value. Will this be over and above the above condition of Vsense max being 5 times the specified value?
Can anyone please answer my query above regarding burst mode operation.
The answer to your question is no. Here is the explanation:
The peak current sense voltage during Burst Mode operation is clamped to approximately one-third of the maximum sense threshold even though the voltage on the ITH pin (not ILIM pin) indicates a lower value.
If the DC path is disabled and the ILIM pin is floated, for instance, then the maximum current sense threshold will be equal to 20mV * 5 which comes to 100mV. During burst mode operation, the peak current sense voltage will then be equal to 100mV / 3 or 33mV. Once the load rises high enough, the converter will leave burst mode. When this happens, the converter will operate in continuous mode and the maximum current sense threshold will return to 100mV.
Let me know if you have anymore questions.