ZHCSUV3E April 2009 – April 2024 TPS22960
PRODUCTION DATA
When the switch is enabled, the output capacitors must be charged up from 0 V to the set value (in this example, 3.3 V). This charge arrives in the form of inrush current. Inrush current can be calculated using the following equation:
Where:
C = output capacitance
dV = output voltage
dt = rise time
The TPS22960 offers selectable rise time control for VOUT. This feature allows the user to control the inrush current during turnon. Equation 1 can be used to find the required rise time to limit the inrush current to the design requirements
dt = 290 μs (4)
To ensure an inrush current of less than 200 mA, SR must be set high for a rise time greater than 290 μs. The following application curves show the different inrush for each SR setting in this design example.