SLUSBO6C JANUARY 2014 – October 2018 TPS40425
PRODUCTION DATA.
Current sensing is based on inductor DCR (direct current resistance) sensing or a separate current sense resistor. Temperature sensing must be based on the ΔVbe measurement of an external diode (x3904). This mode can be used with standard power-stages, such as the CSD95372A.
If inductor DCR is used for current sensing, the TPS40425 device compensates for the temperature variation of DCR value by using the temperature sensed at the external sensor for that channel. The temperature-compensated DCR value is used both for reporting inductor current over PMBus and for overcurrent fault and warning functions.
If a sense resistor is used for current sensing and the temperature variation of resistor value is very small, the temperature compensation in the TPS40425 device can be disabled. See the MFR_SPECIFIC_21 (OPTIONS) (E5h) section for more information.