Other Parts Discussed in Thread: LM5175
I have three questions about the LM5175-Q1:
1.Is the calculation of the inductor current during a short circuit an algorithm such as the overcurrent protection threshold voltage (buck:76mV, boost:160mV) / sampling resistor, so that when the calculated threshold is biased to the maximum, the inductor current is relatively large during a short circuit. Is there any other short circuit protection mechanism?
2.My customer found that after entering the working condition of buck-boost, the switching frequency will be halved, which is the data measured in the actual application. There is no corresponding description in the specification and datasheet. Is this a normal phenomenon? Is there any parameters and explanations?
3.My customer wants to use LM5175-Q1 to charge the battery, and the current-limit mode (constant current loop) is set. The customer wants to know how to test the open-loop gain of the current loop, since the test result of them seems abnormal (oscillation). The method they used is the inject the small signal to the Rsense(R448 in the figure) of PIN ISNS+ and ISNS-.