Other Parts Discussed in Thread: LM5176
Hi Team,
Please help on following question:
1. According to the data sheet, when the output is 12V, the input circuit of 17V and above will enter the BUCK mode, and the lower MOSFET Q2 will be turned off. In the actual debugging process of the DEMO board, 32V input is found. When 12V output, when the load is 3A, Q2 is turned off, and Q1 Turn on the BULK mode, but when the load drops to within 1A, the lower MOSFET Q2 will be turned on:
2. According to the data sheet, for example, from the high-voltage BULK mode to lower load, the high-end Q1 duty cycle continues to increase at this time. When the Q1 duty cycle reaches 75%, the IC will enter the BULK-BOOST mode, but start from the low-voltage BOOST mode How does the IC judge whether to enter the BULK-BOOST mode when boosting is not detailed in the specification, please help explain.
3.There is no OVP protection function in LM25118, can you help me recommend other T1 buck-boost ICs with OVP function or any good suggestions to go to the external line for OVP protection (for example, which PIN is better for comparison and protection)
4. There is no external OTP protection function in the LM25118, only the built-in OTP function of the IC, and the protection temperature is as high as 165°C, which cannot effectively protect the power MOSFET and inductors from over-temperature. Can you help recommend other T1 buck-boost ICs with OTP function or Is there any good suggestion to go to the external line for OTP protection (for example, which PIN is better for comparison and protection).
Thanks and best regards,
Jamie