ZHCSG04F january 2017 – may 2023 TPS65235-1
PRODUCTION DATA
The boost converter has the cycle-by-cycle peak current limit on the internal Power MOSFET switch to serve as the secondary protection when LNB output is hard short. With ISW bit default setting 0b on I2C control register 0x01, the switch current limit ISW is proportional as LDO current limit I(OCP) set by ISET pin resistor, and the relationship can be expressed as:
For the 5 V VIN, if LNB current load is up to 1 A, the ISW bit must be written as 1b, the switch current limit ISW for the internal Power MOSFET is:
While due to the high power loss at 5 V, VIN, it has a chance to trigger the thermal shutdown before the loading is up to 1 A, especially the VLNB output is high.