SLVSFQ6A November 2020 – June 2021 TPS2640
PRODUCTION DATA
In case of short circuit and over load current limit, when the device interrupts current flow, input inductance generates a positive voltage spike on the input and output inductance generates a negative voltage spike on the output. The peak amplitude of voltage spikes (transients) is dependent on value of inductance in series to the input or output of the device. Such transients can exceed the Abolsute Maximum Ratings of the device if steps are not taken to address the issue.
Typical methods for addressing transients include
The approximate value of input capacitance can be estimated with Equation 24.
where
Some applications may require additional Transient Voltage Suppressor (TVS) to prevent transients from exceeding the Abolsute Maximum Ratings of the device. These transients can occur during positive and negative surge tests on the supply lines. In such applications it is recommended to place atleast 1 μF of input capacitor to limit the falling slew rate of the input voltage within a maximum of 15 V/μs.
The circuit implementation with optional protection components (a ceramic capacitor, TVS and schottky diode) is shown in Figure 11-1.