ZHCSGV0F July 2017 – December 2021 TPS22916
PRODUCTION DATA
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The TPS22916B, TPS22916BL, TPS22916C, and TPS22916CL include a Quick Output Discharge feature. When the switch is disabled, a discharge resistor is connected between VOUT and GND. This resistor has a typical value of QOD and prevents the output from floating while the switch is disabled.
As load capacitance and load resistance increase: tFALL increases. The larger the load resistance or load capacitance is, the longer it takes to discharge the capacitor, resulting in a longer fall time.
The output fall time is determined by how quickly the load capacitance is discharged and can be found using Equation 1 .
Where
With the Quick Output Discharge feature, the QOD resistance is in parallel with RL. This provides a lower total load resistance as seen from the load capacitance which discharges the capacitance faster resulting in a smaller tFALL.